# Fluster

![fluster](https://github.com/fluendo/fluster/workflows/fluster/badge.svg)

Fluster is a testing framework written in Python for decoder conformance. It
is composed of a [CLI](https://en.wikipedia.org/wiki/Command-line_interface)
application that runs a number of test suites with the supported decoders. Its
purpose is to check different decoder implementations against known test suites
with known and proven results. It was originally designed to check the
conformance of H.265/HEVC decoders, but it also supports H.264/AVC, H.266/VVC,
VP8, VP9, AV1, MPEG2 video, AAC and AC-4. It can easily be extended to add more decoders and test
suites.

## Table of Contents

- [Fluster](#fluster)
  - [Table of Contents](#table-of-contents)
  - [Description](#description)
  - [How to get started](#how-to-get-started)
  - [Docker Support](#docker-support)
  - [How to use](#how-to-use)
  - [Test Suites](#test-suites)
  - [Decoders](#decoders)
  - [CLI usage](#cli-usage)
    - [List](#list)
    - [Run](#run)
    - [Download](#download)
    - [Reference](#reference)
  - [Report](#report)
  - [FAQ](#faq)
    - [Where does the name come from?](#where-does-the-name-come-from)
    - [How can I add a new decoder?](#how-can-i-add-a-new-decoder)
    - [How can I create a new test suite?](#how-can-i-create-a-new-test-suite)
    - [How can I use it to test regressions?](#how-can-i-use-it-to-test-regressions)
    - [How can I contribute?](#how-can-i-contribute)
    - [How can I report an issue?](#how-can-i-report-an-issue)
  - [License](#license)

## Description

Fluster requires **Python 3.7+** to work. It has zero dependencies apart from
that. The [requirements-dev.txt](https://github.com/fluendo/fluster/blob/master/requirements-dev.txt) file includes Python's modules
used only for development.

The framework works with test suites. Each test suite is associated with one
codec and contains a number of test vectors. Each test vector consists of an
input file and the expected result. The input file will be fed into each
decoder that supports the codec of the test suite. The file format is a JSON
file. You can find the ones included in the [test_suites](https://github.com/fluendo/fluster/tree/master/test_suites)
directory.

The decoders are the ones in charge of doing the decoding given an input file.
They implement two methods: `decode` which is mandatory and `check` which is
optional. Check out the [decoder class](https://github.com/fluendo/fluster/blob/master/fluster/decoder.py) for reference. The
`@register_decoder` decorator is used to ensure the framework takes them into
account. Fluster is agnostic as to how the decoding itself is done. So far, all
decoders are external processes that need to run with a number of parameters,
but they could actually be decoders written in Python as far as Fluster is
concerned. The [decoders](https://github.com/fluendo/fluster/tree/master/fluster/decoders) directory contains all supported
decoders.

**Fluster includes a pixel comparison method for testing decoders that don't generate identical outputs.** 
This is essential for older video decoders with IDCT implementations where, 
according to the standard specifications, MD5 verification cannot be used unlike newer decoder implementations, 
ensuring accurate conformance testing across different decoder generations.

In order to run the tests for the different test suites and decoders, a
`resources` directory containing all the input files for each test suite needs
to be collected first.

## How to get started

- Clone the repository: `git clone https://github.com/fluendo/fluster.git`

or

- [Release source code](https://github.com/fluendo/fluster/releases) assets are available in the following formats zip, tar.gz

Find more about how to use Fluster in the next section.

## Docker Support

Fluster includes Docker support for testing decoders in isolated, reproducible environments with **hardware acceleration support** (VAAPI, VDPAU, NVDEC, QuickSync). Multiple Ubuntu versions are supported (20.04, 22.04, 24.04) with corresponding system FFmpeg and GStreamer packages.

**All Docker commands must be run from the `docker/` directory.**

For complete setup, usage examples, hardware acceleration configuration, and troubleshooting, see **[docker/README.md](docker/README.md)**.

## How to use

1. Download the resources for the test suites. This will create the `resources`
   directory containing the input files for each test suite. `./fluster.py
   download` will spawn a number of processes to download and extract the
   files. You can change the number of parallel processes used with `-j`. It
   defaults to 2x number of logical cores.

   Use the `-c/--codec` option to download test suites for specific codecs:
   - `./fluster.py download -c H.264,H.265` downloads all H.264 and H.265 test suites
   - `./fluster.py download AV1-TEST-VECTORS VP9-TEST-VECTORS` downloads the specific AV1-TEST-VECTORS and VP9-TEST-VECTORS test suite
   - `./fluster.py download -c VP9 AV1-TEST-VECTORS` downloads all VP9 test suites plus the specific AV1-TEST-VECTORS
   - `./fluster.py download` downloads all available test suites

2. (Optional) Build the reference decoders for AAC, H.264/AVC, H.265/HEVC,
   H.266/VVC running `make all_reference_decoders`. This is available and has been 
   tested with x86_64 and Linux. It assumes you have CMake and a native compiler 
   such as gcc or clang installed so that they can be built. The resulting binaries 
   will be moved to a new `decoders` directory in the root.

3. List the test suites and the decoders available `./fluster.py list`.
   Tip: You can list the decoders that can run in the current system with `./fluster.py list -c`.

```bash
List of available test suites:

VP9-TEST-VECTORS
    Codec: VP9
    Description: VP9 Test Vector Catalogue from https://storage.googleapis.com/downloads.webmproject.org/test_data/libvpx/
    Test vectors: 305

VP9-TEST-VECTORS-HIGH
    Codec: VP9
    Description: VP9 High Bit Depth Test Vectors from https://storage.googleapis.com/downloads.webmproject.org/test_data/libvpx/
    Test vectors: 6

JVT-FR-EXT
    Codec: H.264
    Description: JVT Fidelity Range Extension test suite
    Test vectors: 69

JVT-MVC
    Codec: H.264
    Description: JVT Multiview Video Coding test suite
    Test vectors: 20

JVT-SVC
    Codec: H.264
    Description: JVT Scalable Video Coding test suite
    Test vectors: 185

JVT-Professional_profiles
    Codec: H.264
    Description: JVT Professional Profiles test suite
    Test vectors: 38

JVT-AVC_V1
    Codec: H.264
    Description: JVT Advanced Video Coding v1 test suite
    Test vectors: 135

JCT-VC-SHVC
    Codec: H.265
    Description: JCT-VC HEVC Scalable High Efficiency Video Coding Extension
    Test vectors: 69

JCT-VC-HEVC_V1
    Codec: H.265
    Description: JCT-VC HEVC version 1
    Test vectors: 147

JCT-VC-SCC
    Codec: H.265
    Description: JCT-VC HEVC Screen Content Coding Extension
    Test vectors: 15

JCT-VC-3D-HEVC
    Codec: H.265
    Description: JCT-VC HEVC 3D Extension
    Test vectors: 27

JCT-VC-MV-HEVC
    Codec: H.265
    Description: JCT-VC HEVC Multiview Extension
    Test vectors: 9

JCT-VC-RExt
    Codec: H.265
    Description: JCT-VC HEVC Range Extension
    Test vectors: 49

MPEG2_AAC-ADIF
    Codec: AAC
    Description: ISO IEC 13818-4 MPEG2 AAC ADIF test suite
    Test vectors: 492
    
MPEG2_AAC-ADTS
    Codec: AAC
    Description: ISO IEC 13818-4 MPEG2 AAC ADTS test suite
    Test vectors: 62

MPEG4_AAC-ADIF
    Codec: AAC
    Description: ISO IEC 14496-26 MPEG4 AAC ADIF test suite
    Test vectors: 9

MPEG4_AAC-ADTS
    Codec: AAC
    Description: ISO IEC 14496-26 MPEG4 AAC ADTS test suite
    Test vectors: 9

MPEG4_AAC-MP4
    Codec: AAC
    Description: ISO IEC 14496-26 MPEG4 AAC MP4 test suite
    Test vectors: 743

MPEG4_AAC-MP4-ER
    Codec: AAC
    Description: ISO IEC 14496-26 MPEG4 AAC MP4 error resilient and a few other profiles test suite
    Test vectors: 117

AC4_ELEMENTARY_STREAMS
    Codec: AC-4
    Description: Dolby AC-4 elementary stream test suite for conformance testing against the Dolby Pro Audio Decoder reference
    Test vectors: 10

VP8-TEST-VECTORS
    Codec: VP8
    Description: VP8 Test Vector Catalogue from https://github.com/webmproject/vp8-test-vectors
    Test vectors: 61

JVET-VVC_draft6
    Codec: H.266
    Description: JVET VVC draft6
    Test vectors: 282

MPEG2_VIDEO-422
    Codec: MPEG2_VIDEO
    Description: ISO IEC 13818-4 MPEG2 video 422 profile test suite
    Test vectors: 9

MPEG2_VIDEO-MAIN
    Codec: MPEG2_VIDEO
    Description: ISO IEC 13818-4 MPEG2 video main profile test suite
    Test vectors: 43

MPEG4_VIDEO-SimpleProfile
    Codec: MPEG4_VIDEO
    Description: ISO IEC 14496-4 MPEG4 video simple profile test suite
    Test vectors: 3

MPEG4_VIDEO-AdvancedSimpleProfile
    Codec: MPEG4_VIDEO
    Description: ISO IEC 14496-4 MPEG4 video advanced simple profile test suite
    Test vectors: 30

MPEG4_VIDEO-SimpleStudioProfile
    Codec: MPEG4_VIDEO
    Description: ISO IEC 14496-4 MPEG4 video simple studio profile test suite
    Test vectors: 24

MPEG4_VIDEO-SimpleScalableProfile
    Codec: MPEG4_VIDEO
    Description: ISO IEC 14496-4 MPEG4 video simple scalable profile test suite
    Test vectors: 13

CHROMIUM-10bit-AV1-TEST-VECTORS
    Codec: AV1
    Description: AV1 Test Vector Catalogue from https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/tast-tests/src/chromiumos/tast/local/bundles/cros/video/data/test_vectors/av1/
    Test vectors: 23

CHROMIUM-8bit-AV1-TEST-VECTORS
    Codec: AV1
    Description: AV1 Test Vector Catalogue from https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/tast-tests/src/chromiumos/tast/local/bundles/cros/video/data/test_vectors/av1/
    Test vectors: 13

AV1-ARGON-PROFILE0-CORE-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 0 Core Annex B test suite
    Test vectors: 815

AV1-ARGON-PROFILE0-ERROR-NON-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 0 Error Non-Annex B test suite
    Test vectors: 114

AV1-ARGON-PROFILE0-NON-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 0 Non-Annex B test suite
    Test vectors: 70

AV1-ARGON-PROFILE0-STRESS-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 0 Stress Annex B test suite
    Test vectors: 88

AV1-ARGON-PROFILE1-CORE-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 1 Core Annex B test suite
    Test vectors: 781

AV1-ARGON-PROFILE1-ERROR-NON-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 1 Error Non-Annex B test suite
    Test vectors: 113

AV1-ARGON-PROFILE1-NON-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 1 Non-Annex B test suite
    Test vectors: 69

AV1-ARGON-PROFILE1-STRESS-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 1 Stress Annex B test suite
    Test vectors: 77

AV1-ARGON-PROFILE2-CORE-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 2 Core Annex B test suite
    Test vectors: 946

AV1-ARGON-PROFILE2-ERROR-NON-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 2 Error Non-Annex B test suite
    Test vectors: 108

AV1-ARGON-PROFILE2-NON-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 2 Non-Annex B test suite
    Test vectors: 63

AV1-ARGON-PROFILE2-STRESS-ANNEX-B
    Codec: AV1
    Description: AV1 Argon Profile 2 Stress Annex B test suite
    Test vectors: 87

AV1-TEST-VECTORS
    Codec: AV1
    Description: AV1 Test Vector Catalogue from https://storage.googleapis.com/aom-test-data
    Test vectors: 242

List of available decoders:

H.264
    Chromium-H.264: Chromium H.264 decoder for Chromium
    FFmpeg-H.264: FFmpeg H.264 SW decoder
    FFmpeg-H.264-CUDA: FFmpeg H.264 CUDA decoder
    FFmpeg-H.264-D3D11VA: FFmpeg H.264 D3D11VA decoder
    FFmpeg-H.264-DXVA2: FFmpeg H.264 DXVA2 decoder
    FFmpeg-H.264-QSV: FFmpeg H.264 QSV decoder
    FFmpeg-H.264-VAAPI: FFmpeg H.264 VAAPI decoder
    FFmpeg-H.264-VDPAU: FFmpeg H.264 VDPAU decoder
    FFmpeg-H.264-Vulkan: FFmpeg H.264 Vulkan decoder
    FFmpeg-H.264-v4l2m2m: FFmpeg H.264 v4l2m2m decoder
    Fluendo-H.264-DXVA2-Gst1.0: Fluendo H.264 DXVA2 decoder for GStreamer 1.0
    Fluendo-H.264-HW-lcevchwvah264dec-Gst1.0: Fluendo H.264 HW decoder for GStreamer 1.0
    Fluendo-H.264-SW-Gst1.0: Fluendo H.264 SW decoder for GStreamer 1.0
    Fluendo-H.264-VAAPI-Gst1.0: Fluendo H.264 VAAPI decoder for GStreamer 1.0
    Fluendo-H.264-VDA-Gst1.0: Fluendo H.264 VDA decoder for GStreamer 1.0
    Fluendo-H.264-VDPAU-Gst1.0: Fluendo H.264 VDPAU decoder for GStreamer 1.0
    Fluendo-H.264-VT-Gst1.0: Fluendo H.264 VT decoder for GStreamer 1.0
    GStreamer-H.264-D3D11-Gst1.0: GStreamer H.264 D3D11 decoder for GStreamer 1.0
    GStreamer-H.264-D3D12-Gst1.0: GStreamer H.264 D3D12 decoder for GStreamer 1.0
    GStreamer-H.264-Libav-Gst1.0: GStreamer H.264 Libav decoder for GStreamer 1.0
    GStreamer-H.264-MSDK-Gst1.0: GStreamer H.264 MSDK decoder for GStreamer 1.0
    GStreamer-H.264-NVDEC-Gst1.0: GStreamer H.264 NVDEC decoder for GStreamer 1.0
    GStreamer-H.264-NVDECSL-Gst1.0: GStreamer H.264 NVDECSL decoder for GStreamer 1.0
    GStreamer-H.264-OpenH264-Gst1.0: GStreamer H.264 OpenH264 decoder for GStreamer 1.0
    GStreamer-H.264-QSV-Gst1.0: GStreamer H.264 QSV decoder for GStreamer 1.0
    GStreamer-H.264-V4L2-Gst1.0: GStreamer H.264 V4L2 decoder for GStreamer 1.0
    GStreamer-H.264-V4L2SL-Gst1.0: GStreamer H.264 V4L2SL decoder for GStreamer 1.0
    GStreamer-H.264-VA-Gst1.0: GStreamer H.264 VA decoder for GStreamer 1.0
    GStreamer-H.264-VAAPI-Gst1.0: GStreamer H.264 VAAPI decoder for GStreamer 1.0
    GStreamer-H.264-Vulkan-Gst1.0: GStreamer H.264 Vulkan decoder for GStreamer 1.0
    JCT-VT-H.264: JCT-VT H.264/AVC reference decoder
    VKVS-H.264: Vulkan Video Samples H.264 decoder
    ccdec-H.264: H.264 cros-codecs decoder

Dummy
    Dummy: This is a dummy implementation for the dummy codec

AV1
    FFmpeg-AV1-CUDA: FFmpeg AV1 CUDA decoder
    FFmpeg-AV1-VAAPI: FFmpeg AV1 VAAPI decoder
    FFmpeg-AV1-VDPAU: FFmpeg AV1 VDPAU decoder
    FFmpeg-AV1-Vulkan: FFmpeg AV1 Vulkan decoder
    GStreamer-AV1-D3D11-Gst1.0: GStreamer AV1 D3D11 decoder for GStreamer 1.0
    GStreamer-AV1-D3D12-Gst1.0: GStreamer AV1 D3D12 decoder for GStreamer 1.0
    GStreamer-AV1-V4L2SL-Gst1.0: GStreamer AV1 V4L2SL decoder for GStreamer 1.0
    GStreamer-AV1-VA-Gst1.0: GStreamer AV1 VA decoder for GStreamer 1.0
    GStreamer-AV1-VAAPI-Gst1.0: GStreamer AV1 VAAPI decoder for GStreamer 1.0
    GStreamer-AV1-Vulkan-Gst1.0: GStreamer AV1 Vulkan decoder for GStreamer 1.0
    GStreamer-AV1-dav1d-Gst1.0: GStreamer AV1 dav1d decoder for GStreamer 1.0
    GStreamer-AV1-libaom-Gst1.0: GStreamer AV1 libaom decoder for GStreamer 1.0
    GStreamer-AV1-V4L2-Gst1.0: GStreamer AV1 V4L2 decoder for GStreamer 1.0
    VKVS-AV1: Vulkan Video Samples AV1 decoder
    ccdec-AV1: AV1 cros-codecs decoder
    dav1d-AV1: dav1d AV1 decoder
    libaom-AV1: libaom AV1 reference decoder

H.265
    FFmpeg-H.265: FFmpeg H.265 SW decoder
    FFmpeg-H.265-CUDA: FFmpeg H.265 CUDA decoder
    FFmpeg-H.265-D3D11VA: FFmpeg H.265 D3D11VA decoder
    FFmpeg-H.265-DXVA2: FFmpeg H.265 DXVA2 decoder
    FFmpeg-H.265-VAAPI: FFmpeg H.265 VAAPI decoder
    FFmpeg-H.265-VDPAU: FFmpeg H.265 VDPAU decoder
    FFmpeg-H.265-Vulkan: FFmpeg H.265 Vulkan decoder
    FFmpeg-H.265-v4l2m2m: FFmpeg H.265 v4l2m2m decoder
    Fluendo-H.265-DXVA2-Gst1.0: Fluendo H.265 DXVA2 decoder for GStreamer 1.0
    Fluendo-H.265-SW-Gst1.0: Fluendo H.265 SW decoder for GStreamer 1.0
    Fluendo-H.265-VAAPI-Gst1.0: Fluendo H.265 VAAPI decoder for GStreamer 1.0
    Fluendo-H.265-VDA-Gst1.0: Fluendo H.265 VDA decoder for GStreamer 1.0
    Fluendo-H.265-VDPAU-Gst1.0: Fluendo H.265 VDPAU decoder for GStreamer 1.0
    Fluendo-H.265-VT-Gst1.0: Fluendo H.265 VT decoder for GStreamer 1.0
    GStreamer-H.265-D3D11-Gst1.0: GStreamer H.265 D3D11 decoder for GStreamer 1.0
    GStreamer-H.265-D3D12-Gst1.0: GStreamer H.265 D3D12 decoder for GStreamer 1.0
    GStreamer-H.265-Libav-Gst1.0: GStreamer H.265 Libav decoder for GStreamer 1.0
    GStreamer-H.265-MSDK-Gst1.0: GStreamer H.265 MSDK decoder for GStreamer 1.0
    GStreamer-H.265-NVDEC-Gst1.0: GStreamer H.265 NVDEC decoder for GStreamer 1.0
    GStreamer-H.265-NVDECSL-Gst1.0: GStreamer H.265 NVDECSL decoder for GStreamer 1.0
    GStreamer-H.265-V4L2-Gst1.0: GStreamer H.265 V4L2 decoder for GStreamer 1.0
    GStreamer-H.265-V4L2SL-Gst1.0: GStreamer H.265 V4L2SL decoder for GStreamer 1.0
    GStreamer-H.265-VA-Gst1.0: GStreamer H.265 VA decoder for GStreamer 1.0
    GStreamer-H.265-VAAPI-Gst1.0: GStreamer H.265 VAAPI decoder for GStreamer 1.0
    GStreamer-H.265-Vulkan-Gst1.0: GStreamer H.265 Vulkan decoder for GStreamer 1.0
    JCT-VT-H.265: JCT-VT H.265/HEVC reference decoder
    VKVS-H.265: Vulkan Video Samples H.265 decoder
    ccdec-H.265: H.265 cros-codecs decoder

H.266
    FFmpeg-H.266: FFmpeg H.266 SW decoder
    Fluendo-H.266-SW-Gst1.0: Fluendo H.266 SW decoder for GStreamer 1.0
    GStreamer-H.266-Libav-Gst1.0: GStreamer H.266 Libav decoder for GStreamer 1.0
    GStreamer-H.266-VA-Gst1.0: GStreamer H.266 VA decoder for GStreamer 1.0
    GStreamer-H.266-VVdeC-Gst1.0: GStreamer H.266 VVdeC decoder for GStreamer 1.0
    VVCSoftware_VTM-H266: VVCSoftware_VTM H.266/VVC reference decoder
    VVdeC-H266: VVdeC H.266/VVC decoder

MPEG2_VIDEO
    FFmpeg-MPEG2_VIDEO: FFmpeg MPEG2 VIDEO SW decoder
    Fluendo-MPEG2_VIDEO-DXVA2-Gst1.0: Fluendo MPEG2_VIDEO DXVA2 decoder for GStreamer 1.0
    Fluendo-MPEG2_VIDEO-SW-Gst1.0: Fluendo MPEG2 VIDEO SW decoder for GStreamer 1.0
    Fluendo-MPEG2_VIDEO-VAAPI-Gst1.0: Fluendo MPEG2_VIDEO VAAPI decoder for GStreamer 1.0
    Fluendo-MPEG2_VIDEO-VDPAU-Gst1.0: Fluendo MPEG2_VIDEO VDPAU decoder for GStreamer 1.0
    GStreamer-MPEG2_VIDEO-Libav-Gst1.0: GStreamer MPEG2_VIDEO Libav decoder for GStreamer 1.0
    GStreamer-MPEG2_VIDEO-SW-Gst1.0: GStreamer MPEG2_VIDEO SW decoder for GStreamer 1.0
    ISO-MPEG2-VIDEO: ISO MPEG2 Video reference decoder

MPEG4_VIDEO
    FFmpeg-MPEG4_VIDEO: FFmpeg MPEG4_VIDEO SW decoder
    Fluendo-MPEG4_VIDEO-SW-Gst1.0: Fluendo MPEG4_VIDEO SW decoder for GStreamer 1.0
    Fluendo-MPEG4_VIDEO-VAAPI-Gst1.0: Fluendo MPEG4_VIDEO VAAPI decoder for GStreamer 1.0
    Fluendo-MPEG4_VIDEO-VDPAU-Gst1.0: Fluendo MPEG4_VIDEO VDPAU decoder for GStreamer 1.0
    GStreamer-MPEG4_VIDEO-Libav-Gst1.0: GStreamer MPEG4_VIDEO Libav decoder for GStreamer 1.0
    ISO-MPEG4-VIDEO: ISO MPEG4 Video reference decoder

VP8
    FFmpeg-VP8: FFmpeg VP8 SW decoder
    FFmpeg-VP8-CUDA: FFmpeg VP8 CUDA decoder
    FFmpeg-VP8-VAAPI: FFmpeg VP8 VAAPI decoder
    FFmpeg-VP8-v4l2m2m: FFmpeg VP8 v4l2m2m decoder
    GStreamer-VP8-D3D11-Gst1.0: GStreamer VP8 D3D11 decoder for GStreamer 1.0
    GStreamer-VP8-Libav-Gst1.0: GStreamer VP8 Libav decoder for GStreamer 1.0
    GStreamer-VP8-NVDEC-Gst1.0: GStreamer VP8 NVDEC decoder for GStreamer 1.0
    GStreamer-VP8-NVDECSL-Gst1.0: GStreamer VP8 NVDECSL decoder for GStreamer 1.0
    GStreamer-VP8-V4L2-Gst1.0: GStreamer VP8 V4L2 decoder for GStreamer 1.0
    GStreamer-VP8-V4L2SL-Gst1.0: GStreamer VP8 V4L2SL decoder for GStreamer 1.0
    GStreamer-VP8-VA-Gst1.0: GStreamer VP8 VA decoder for GStreamer 1.0
    GStreamer-VP8-VAAPI-Gst1.0: GStreamer VP8 VAAPI decoder for GStreamer 1.0
    GStreamer-VP8-libvpx-Gst1.0: GStreamer VP8 libvpx decoder for GStreamer 1.0
    ccdec-VP8: VP8 cros-codecs decoder
    libvpx-VP8: VP8 reference decoder

VP9
    FFmpeg-VP9: FFmpeg VP9 SW decoder
    FFmpeg-VP9-CUDA: FFmpeg VP9 CUDA decoder
    FFmpeg-VP9-VAAPI: FFmpeg VP9 VAAPI decoder
    FFmpeg-VP9-VDPAU: FFmpeg VP9 VDPAU decoder
    FFmpeg-VP9-Vulkan: FFmpeg VP9 Vulkan decoder
    FFmpeg-VP9-v4l2m2m: FFmpeg VP9 v4l2m2m decoder
    GStreamer-VP9-D3D11-Gst1.0: GStreamer VP9 D3D11 decoder for GStreamer 1.0
    GStreamer-VP9-D3D12-Gst1.0: GStreamer VP9 D3D12 decoder for GStreamer 1.0
    GStreamer-VP9-Libav-Gst1.0: GStreamer VP9 Libav decoder for GStreamer 1.0
    GStreamer-VP9-NVDEC-Gst1.0: GStreamer VP9 NVDEC decoder for GStreamer 1.0
    GStreamer-VP9-NVDECSL-Gst1.0: GStreamer VP9 NVDECSL decoder for GStreamer 1.0
    GStreamer-VP9-V4L2-Gst1.0: GStreamer VP9 V4L2 decoder for GStreamer 1.0
    GStreamer-VP9-V4L2SL-Gst1.0: GStreamer VP9 V4L2SL decoder for GStreamer 1.0
    GStreamer-VP9-VA-Gst1.0: GStreamer VP9 VA decoder for GStreamer 1.0
    GStreamer-VP9-VAAPI-Gst1.0: GStreamer VP9 VAAPI decoder for GStreamer 1.0
    GStreamer-VP9-Vulkan-Gst1.0: GStreamer VP9 Vulkan decoder for GStreamer 1.0
    GStreamer-VP9-libvpx-Gst1.0: GStreamer VP9 libvpx decoder for GStreamer 1.0
    VKVS-VP9: Vulkan Video Samples VP9 decoder
    ccdec-VP9: VP9 cros-codecs decoder
    libvpx-VP9: VP9 reference decoder

AAC
    Fluendo-AAC-SW-Gst1.0: Fluendo AAC SW decoder for GStreamer 1.0
    ISO-MPEG2-AAC: ISO MPEG2 AAC reference decoder
    ISO-MPEG4-AAC: ISO MPEG4 AAC reference decoder
    ISO-MPEG4-AAC-ER: ISO MPEG4 AAC error resilient reference decoder

AC-4
    Fluendo-AC4-SW-Gst1.0: Fluendo AC-4 SW decoder for GStreamer 1.0
```

4. Run the test suite (or a number of them) for all decoders (or a number of
   them). By default, decoder tests are run in parallel using the same
   amount of jobs as number of cores, but it can be configured using
   the `-j` option. You can pass `-d` to filter only the decoders that you want
   to run, `-ts` for the test suites and `-tv` for the test vectors. Examples:

    - `./fluster.py run` runs all test suites for all decoders available that
      match each test suite's codec.
    - `./fluster.py run -ts JCT-VC-HEVC_V1` runs the *JCT-VC-HEVC_V1* test
      suite for all decoders that support H.265/HEVC.
    - `./fluster.py run -ts JCT-VC-HEVC_V1 -tv AMP_A_Samsung_7` runs only the
      test vector *AMP_A_Samsung_7* of the *JCT-VC-HEVC_V1* test suite.
    - `./fluster.py run -d FFmpeg-H.265` runs the *FFmpeg-H265* decoder on all
      test suites for H.265/HEVC.
    - `./fluster.py run -d FFmpeg-H.265 -j1` runs the *FFmpeg-H265* decoder on all
      test suites for H.265/HEVC using one job.

## Test Suites

- Dummy test suite for testing purposes.
- [AAC](https://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_13818-4_2004_Conformance_Testing/AAC/).
- [AAC](https://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_14496-26_2010_Bitstreams/DVD1/mpeg4audio-conformance/).
- [AC-4](https://ott.dolby.com/OnDelKits/AC-4/Dolby_AC-4_Online_Delivery_Kit_1.5/Test_Signals/elementary_streams/Audio.zip) (Dolby AC-4 Online Delivery Kit v1.5, available to Dolby licensees).
- [AV1](https://storage.googleapis.com/aom-test-data/).
- [AV1](https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/tast-tests/src/chromiumos/tast/local/bundles/cros/video/data/test_vectors/av1/).
- [AV1](https://aom-cwg-av1-argon-streams-public.s3.us-east-1.amazonaws.com/).
- [H.264/AVC](https://www.itu.int/wftp3/av-arch/jvt-site/draft_conformance/).
- [H.265/HEVC](https://www.itu.int/wftp3/av-arch/jctvc-site/bitstream_exchange/draft_conformance/).
- [H.266/VVC](https://www.itu.int/wftp3/av-arch/jvet-site/bitstream_exchange/VVC/draft_conformance/).
- [VP8](https://github.com/webmproject/vp8-test-vectors).
- [VP9](https://storage.googleapis.com/downloads.webmproject.org/test_data/libvpx).
- [MPEG2 VIDEO](https://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_13818-4_2004_Conformance_Testing/Video/).

## Decoders

- Dummy decoder for testing purposes.
- [JCT-VT H.264/AVC](https://vcgit.hhi.fraunhofer.de/jvet/JM) as reference
  decoder for H.264/AVC.
- [JCT-VT H.265/HEVC](https://vcgit.hhi.fraunhofer.de/jvet/HM) as reference
  decoder for H.265/HEVC.
- [JCT-VT H.266/VVC](https://vcgit.hhi.fraunhofer.de/jvet/VVCSoftware_VTM) as reference
  decoder for H.266/VVC.
- Fluendo's proprietary decoders for MPEG2 video, MPEG4 video, H.264/AVC, H.265/HEVC and AC-4 that are included
  in [Fluendo Codec
  Pack](https://fluendo.com/products/fluendo-codec-pack/).
- [GStreamer's](https://gstreamer.freedesktop.org/) for H.266/VVC.
- [GStreamer's](https://gstreamer.freedesktop.org/) for H.265/HEVC.
- [GStreamer's](https://gstreamer.freedesktop.org/) for H.264/AVC.
- [GStreamer's](https://gstreamer.freedesktop.org/) for MPEG2 video.
- [GStreamer's](https://gstreamer.freedesktop.org/) for MPEG4 video.
- [FFmpeg's](https://FFmpeg.org) for H.265/HEVC.
- [FFmpeg's](https://FFmpeg.org) for H.264/AVC.
- [FFmpeg's](https://FFmpeg.org) for MPEG2 video.
- [FFmpeg's](https://FFmpeg.org) for MPEG4 video.
- [libvpx's](https://github.com/webmproject/libvpx/) for VP8.
- [libvpx's](https://github.com/webmproject/libvpx/) for VP9.
- [aom's](https://aomedia.googlesource.com/aom/) for AV1.

## CLI usage

```bash
./fluster.py --help

usage: fluster.py [-h] [-r RESOURCES] [-o OUTPUT] [-ne] [-tsd TEST_SUITES_DIR] {list,l,run,r,download,d,reference,f} ...

options:
  -h, --help            show this help message and exit
  -r RESOURCES, --resources RESOURCES
                        set the directory where resources are taken from
  -o OUTPUT, --output OUTPUT
                        set the directory where decoder outputs will be stored
  -ne, --no-emoji       set to use plain text instead of emojis
  -tsd TEST_SUITES_DIR, --test-suites-dir TEST_SUITES_DIR
                        set directory where test suite will be read from, multiple directories are supported with OS path separator (:)

subcommands:
  {list,l,run,r,download,d,reference,f}
    list (l)            show list of available test suites and decoders
    run (r)             run test suites for decoders
    download (d)        downloads test suites resources
    reference (f)       use a specific decoder to set its results for the test suites given
```

### List

```bash
./fluster.py list --help

usage: fluster.py list [-h] [-ts TESTSUITES [TESTSUITES ...]] [-tv] [-c] [-v] 
[-d {None,Dummy,H.264,H.265,H.266,VP8,VP9,AAC,AV1,MPEG2_VIDEO,MPEG4_VIDEO}]

optional arguments:
  -h, --help            show this help message and exit
  -ts TESTSUITES [TESTSUITES ...], --testsuites TESTSUITES [TESTSUITES ...]
                        show only the test suites given
  -tv, --testvectors    show test vectors of test suites
  -c, --check           check which decoders can be run successfully. Reports ✔️ or ❌
  -v, --verbose         show stdout and stderr of commands executed
  -d {None,Dummy,H.264,H.265,H.266,VP8,VP9,AAC,AV1,MPEG2_VIDEO,MPEG4_VIDEO}, --codec {None,Dummy,H.264,H.265,H.266,VP8,VP9,AAC,AV1,MPEG2_VIDEO,MPEG4_VIDEO}
                        show decoders and test suites of a codec
```

### Run

```bash
./fluster.py run --help

usage: fluster.py run [-h] [-j JOBS] [-t TIMEOUT] [-ff] [-q]
[-ts TESTSUITES [TESTSUITES ...]] [-tv TESTVECTORS [TESTVECTORS ...]]
[-sv SKIPVECTORS [SKIPVECTORS ...]] [-d DECODERS [DECODERS ...]] [-s]
[-so SUMMARY_OUTPUT] [-f {md,csv,junitxml}] [-k] [-th THRESHOLD]
[-tth TIME_THRESHOLD] [-v]

optional arguments:
  -h, --help            show this help message and exit
  -j JOBS, --jobs JOBS  number of parallel jobs to use (by default 1x logical cores, 
                        value 0 is interpreted as the same)
  -t TIMEOUT, --timeout TIMEOUT
                        timeout in secs for each decoding. Defaults to 30 secs
  -ff, --failfast       stop after first fail
  -q, --quiet           don't show every test run
  -ts TESTSUITES [TESTSUITES ...], --testsuites TESTSUITES [TESTSUITES ...]
                        run only the specific test suites
  -tv TESTVECTORS [TESTVECTORS ...], --testvectors TESTVECTORS [TESTVECTORS ...]
                        run only the specific test vectors
  -sv SKIPVECTORS [SKIPVECTORS ...], --skipvectors SKIPVECTORS [SKIPVECTORS ...]
                        skip the specific test vectors
  -d DECODERS [DECODERS ...], --decoders DECODERS [DECODERS ...]
                        run only the specific decoders
  -s, --summary         generate a summary in Markdown format for each test
                        suite
  -so SUMMARY_OUTPUT, --summary-output SUMMARY_OUTPUT
                        dump summary output to file
  -f {md,csv,json,junitxml}, --format {md,csv,json,junitxml}
                        specify the format for the summary file
  -k, --keep            keep output files generated during the test
  -th THRESHOLD, --threshold THRESHOLD
                        set exit code to 2 if threshold tests are not success.
                        exit code is 0 otherwise
  -tth TIME_THRESHOLD, --time-threshold TIME_THRESHOLD
                        set exit code to 3 if test suite takes longer than
                        threshold seconds. exit code is 0 otherwise
  -v, --verbose         show stdout and stderr of commands executed
```

### Download

```bash
./fluster.py download --help

usage: fluster.py download [-h] [-j JOBS] [-k] [-r RETRIES] [-c CODEC] [testsuites ...]

positional arguments:
  testsuites            list of testsuites to download

optional arguments:
  -h, --help            show this help message and exit
  -j JOBS, --jobs JOBS  number of parallel jobs to use (upper limit of 16, by default 2x logical cores). 
                        value 0 is interpreted as 1x logical cores
  -k, --keep            keep original downloaded file after extracting. Only applicable to compressed files such as .zip, .tar.gz, etc
  -r RETRIES, --retries RETRIES
                        number of retries, before failing
  -c CODEC, --codec CODEC
                        download test suites for specific codecs only (comma-separated)
```


**Important Note on Behavior:**
- When using both `-c/--codec` and specific test suites, the behavior is **union-based**:
  - All test suites matching the codec filter are downloaded
  - Additionally, all specified test suites are downloaded, regardless of codec
### Reference

```bash
./fluster.py reference --help

usage: fluster.py reference [-h] [-j JOBS] [-t TIMEOUT] [-q] [-v]
decoder testsuites [testsuites ...]

positional arguments:
  decoder               decoder to run
  testsuites            list of testsuites to run the decoder with

optional arguments:
  -h, --help            show this help message and exit
  -j JOBS, --jobs JOBS  number of parallel jobs to use (by default 1x logical cores, 
                        value 0 is interpreted as the same)
  -t TIMEOUT, --timeout TIMEOUT
                        timeout in secs for each decoding. Defaults to 30 secs
  -q, --quiet           don't show every test run
  -v, --verbose         show stdout and stderr of commands executed
```

## Report

[Go to report](https://github.com/fluendo/fluster/blob/master/REPORT.md)

### System Information in Reports

Fluster automatically includes hardware and software specifications in all test summary reports for better reproducibility and debugging. The collected information includes:

- **CPU model**: Processor information
- **GPU(s)**: Graphics devices detected
- **RAM**: Total system memory
- **OS**: Operating system and version
- **Backends**: Hardware acceleration backends and drivers (VA-API, VDPAU, Vulkan on Linux; VideoToolbox on macOS; DirectX on Windows)

This information is included in all supported report formats:

**Markdown** (`-f md`):
```bash
./fluster.py run -ts H264-min -d FFmpeg-H.264 -s -so report.md
```

**JSON** (`-f json`):
```bash
./fluster.py run -ts H264-min -d FFmpeg-H.264 -s -so report.json -f json
```

**JUnit XML** (`-f junitxml`):
```bash
./fluster.py run -ts H264-min -d FFmpeg-H.264 -s -so report.xml -f junitxml
```

**CSV** (`-f csv`):
```bash
./fluster.py run -ts H264-min -d FFmpeg-H.264 -s -so report.csv -f csv
```

The system information appears at the beginning of Markdown reports, as a top-level `system_info` object in JSON reports, and as properties in JUnit XML test suites.

## FAQ

### Where does the name come from?

Fluster in English means [to (cause to) become nervous or
confused](https://www.wordreference.com/definition/fluster). It looks like a
very appropriate name for testing decoders.

### How can I add a new decoder?

1. Create a new decoder in [fluster/decoders](https://github.com/fluendo/fluster/tree/master/fluster/decoders) directory.
2. Implement the `decode` method.
3. Use the `register_decoder` decorator.
4. Ensure to set `hw_acceleration = True` if it requires hardware.
5. Optionally, implement the `check` to know whether the decoder is available
   to be run.

### How can I create a new test suite?

Check out the JSON format they follow in the [test_suites](https://github.com/fluendo/fluster/tree/master/test_suites)
directory. Add a new json file within, Fluster will automatically pick it
up.

There is also a [generator script (MPEG2 video)](https://github.com/fluendo/fluster/blob/master/scripts/gen_mpeg2_video.py), 
[generator script (MPEG4 video)](https://github.com/fluendo/fluster/blob/master/scripts/gen_mpeg4_video.py), 
[generator script (H.264)](https://github.com/fluendo/fluster/blob/master/scripts/gen_jvt.py), 
[generator script (H.265)](https://github.com/fluendo/fluster/blob/master/scripts/gen_jct_vc.py), and a 
[generator script (H.266)](https://github.com/fluendo/fluster/blob/master/scripts/gen_jvet.py) for the 
[conformance test suites](#test-suites) that you can use as a base to generate automatically new ones.

### How can I use it to test regressions?

We can easily use Fluster in a CI to test that our test suites for particular
decoders are still working as good as they were before. There are two arguments
to be used with the [run](#run) command that can help us achieve that. Both
commands work only when running a single test suite:

1. `-th/--threshold` sets the minimum number of tests that need to succeed
   in order to consider the command not a failure. In case of failure, the exit
   code is 2. Please notice that even if some tests fail, the exit code will
   still be 0 as long as the threshold is met.

2. `-tth/--time-threshold` sets the maximum amount of time for a test suite to
   run and still be considered a success. The exit code is 3 in case it takes
   longer and 0 otherwise. Please note that even if some tests fail, the exit
   code will still be 0 as long as the time it takes is less than the threshold.

However, in case we want to be even more explicit, ensuring exactly the same
results are obtained, we can do the following procedure:

1. Store well-known results in an expected file with the output of Fluster's
   run.
2. Run Fluster again and compare with the expected result using diff. The
   following command will return an `exitStatus` different from 0 in case
   there's any difference.

   ```bash
   diffParams='-uB -I"|Test|" --strip-trailing-cr'
   diff $diffParams expected.out current.out
   ```

   We recommend using the `--no-emoji` argument when running on a CI system to
   ensure the log is properly displayed with no issues.

### How can I contribute?

1. Fork the repo.
2. Install the required Python modules for development using `pip3 install -r
   requirements-dev.txt`.
3. Install the [git hook](https://github.com/fluendo/fluster/blob/master/scripts/install_git_hook.sh) that will run for every
   commit to ensure it works before pushing. [About git
   hooks](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks).
4. Follow the Conventional Commits guidelines for commit messages. This ensures
   your commits follow the correct format for versioning and changelog generation.
   You can learn more about Conventional Commits here: [Conventional Commits Specification](https://www.conventionalcommits.org/en/v1.0.0/).
    - Example commit messages:
        - feat: add new feature
        - fix: fix bug in feature
        - docs: update documentation
    - The pre-commit hook will automatically check that your commit messages
      follow the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) format.
      Any commit that doesn't adhere to the format will be rejected.
    - Please correct the following errors:
        - Expected value for type from: build, chore, ci, docs, feat, fix, perf, refactor, revert, style, test.
5. Modify the code. Make sure git hooks are properly checking that the basic
   functionality still works. You can also execute `make check` manually. Take
   into account that some basic tests are run to ensure that GStreamer, FFmpeg
   and libvpx decoders are working fine. Thus, you need to have them available.
   On an Ubuntu 20.04 the needed packages are:

   ```bash
   gstreamer1.0-tools gstreamer1.0-libav gstreamer1.0-plugins-bad ffmpeg
   vpx-tools aom-tools
   ```

6. Create a new PR with your changes.
7. Make sure GitHub Actions jobs are launched and all results are a pass.

### How can I report an issue?

In case you find any problem or want to report something, please search for similar 
[issues](https://github.com/fluendo/fluster/issues) first. If you find none, go ahead to create one. 
Please try to provide as many details and context as possible to help us diagnose it.

## License

**LGPLv3**

```none
Fluster - testing framework for decoders conformance
Copyright (C) 2020-2025, Fluendo, S.A.
  Author: Pablo Marcos Oltra <pmarcos@fluendo.com>, Fluendo, S.A.
  Author: Andoni Morales Alastruey <amorales@fluendo.com>, Fluendo, S.A.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation, either version 3
of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library. If not, see <https://www.gnu.org/licenses/>.
```