{
"metadata": {
"name": "",
"signature": "sha256:b3db3d09e064cfe84d747d44f9507670e8eab728c8bb5cbb4ed2b6cb99f11a98"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "code",
"collapsed": false,
"input": [
"import json, re, subprocess, urllib2\n",
"\n",
"def get_fps_given_nframes(url, nframes):\n",
" try:\n",
" out = subprocess.check_output(['ffprobe', '-i', url, '-show_frames', '-read_intervals', '%+#' + str(nframes), '-select_streams', 'v'], stderr=subprocess.STDOUT)\n",
" except subprocess.CalledProcessError:\n",
" return None\n",
" frametimes = [float(match.group(1)) for match in re.finditer(r'pts_time=([\\d\\.]+)', out)]\n",
" # frametimes contain the beginning timestamps of each frame\n",
" # len(frametimes) - 1 is the numerator below due to fencepost:\n",
" fps = (len(frametimes) - 1) / (max(frametimes) - min(frametimes)) \n",
" return fps\n",
"\n",
"def print_fps_stats(root_url):\n",
" r = json.loads(urllib2.urlopen(root_url + '/r.json').read())\n",
" nframes = int(r['frames']) + int(r['leader'])\n",
" advertised_fps = float(r['fps'])\n",
" print '%s:' % root_url\n",
" for video in ['/0/0/0.mp4', '/0/0/0.webm']:\n",
" url = root_url + video\n",
" actual_fps = get_fps_given_nframes(url, nframes)\n",
" if actual_fps != None:\n",
" print (' %s: %d frames, advertised %.4f, actual %.4f, adv/act = %.2f%%' % \n",
" (video, nframes, advertised_fps, actual_fps, advertised_fps / actual_fps * 100.0))\n",
" else:\n",
" print ' %s: not found' % video"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Compare actual FPS versus advertised FPS\n",
"========================================"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Earth Engine\n",
"------------\n",
"FPS are right on the money for both mp4 and webm"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print_fps_stats('https://earthengine.google.org/timelapse/data/20130507/1068x600')\n",
"print_fps_stats('http://commondatastorage.googleapis.com/earthengine-timelapse/seasonal-20140202/1068x600')"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"https://earthengine.google.org/timelapse/data/20130507/1068x600:\n",
" /0/0/0.mp4: 29 frames, advertised 10.0000, actual 10.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: 29 frames, advertised 10.0000, actual 10.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://commondatastorage.googleapis.com/earthengine-timelapse/seasonal-20140202/1068x600:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 634 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: 634 frames, advertised 12.0000, actual 12.0002, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n"
]
}
],
"prompt_number": 174
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"timemachine.cmucreatelab.org\n",
"----------------------------\n",
"\n",
"Almost all the FPS are 100% accurate for both mp4 and webm. The one exception is Blue Marble, which is 99.98%, but since it's only 12 frames long, such a tiny error only results in a .0024 frame error by the end. (Perhaps it's a lack of precision in reading the frame time, in which case the % error would naturally go down in the longer videos).\n",
"\n",
"An aside: some of the appended black trailers for .mp4 appear to be have a different FPS from the main video, so print_fps_stats compensates by only looking at the frames before the trailer.\n"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print_fps_stats('http://g7.gigapan.org/timemachines/brassica-15m-g10-bf0-l/brassica-15m-g10-bf0-l-1088x624')\n",
"print_fps_stats('http://g7.gigapan.org/timemachines/e5-crf28-g10-bf0-l/e5-crf28-g10-bf0-l90-25fps-1088x624')\n",
"print_fps_stats('http://g7.gigapan.org/timemachines/blue-marble-v2/blue-marble-v2-crf28-6fps-1088x624')\n",
"print_fps_stats('http://g7.gigapan.org/timemachines/pittsburgh-v12/crf26-12fps-l70-1088x624')"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"http://g7.gigapan.org/timemachines/brassica-15m-g10-bf0-l/brassica-15m-g10-bf0-l-1088x624:\n",
" /0/0/0.mp4: 3130 frames, advertised 25.0000, actual 25.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: 3130 frames, advertised 25.0000, actual 25.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://g7.gigapan.org/timemachines/e5-crf28-g10-bf0-l/e5-crf28-g10-bf0-l90-25fps-1088x624:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 1457 frames, advertised 25.0000, actual 25.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: 1457 frames, advertised 25.0000, actual 25.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://g7.gigapan.org/timemachines/blue-marble-v2/blue-marble-v2-crf28-6fps-1088x624:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 12 frames, advertised 6.0000, actual 6.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: 12 frames, advertised 6.0000, actual 6.0011, adv/act = 99.98%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://g7.gigapan.org/timemachines/pittsburgh-v12/crf26-12fps-l70-1088x624:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 15271 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: 15271 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"BreatheCam\n",
"----------\n",
"\n",
"Looks like the transition from spot-on to 100.08% happens on March 10, which appears to be the same day the URL pattern for\n",
"the root directory changes. 100.08% * 1440 frames ~= 1489.2, so the error is definitely enough to give us errors seeking."
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-02-17.timemachine/crf26-12fps-l70-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-01.timemachine/crf26-12fps-l70-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-04.timemachine/crf26-12fps-l70-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-07.timemachine/crf26-12fps-l70-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-08.timemachine/crf26-12fps-l70-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-09.timemachine/crf26-12fps-l70-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-10.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-11.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-12.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-15.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-20.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-04-01.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-05-01.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-06-01.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-07-01.timemachine/crf26-12fps-1424x800')\n",
"print_fps_stats('http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-08-01.timemachine/crf26-12fps-1424x800')"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-02-17.timemachine/crf26-12fps-l70-1424x800:\n",
" /0/0/0.mp4: 1510 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-01.timemachine/crf26-12fps-l70-1424x800:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 1488 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-04.timemachine/crf26-12fps-l70-1424x800:\n",
" /0/0/0.mp4: 1506 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-07.timemachine/crf26-12fps-l70-1424x800:\n",
" /0/0/0.mp4: 1510 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-08.timemachine/crf26-12fps-l70-1424x800:\n",
" /0/0/0.mp4: 1506 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-09.timemachine/crf26-12fps-l70-1424x800:\n",
" /0/0/0.mp4: 1450 frames, advertised 12.0000, actual 12.0000, adv/act = 100.00%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-10.timemachine/crf26-12fps-1424x800:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 1388 frames, advertised 12.0000, actual 11.9910, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-11.timemachine/crf26-12fps-1424x800:\n",
" /0/0/0.mp4: 1488 frames, advertised 12.0000, actual 11.9909, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-12.timemachine/crf26-12fps-1424x800:\n",
" /0/0/0.mp4: 1494 frames, advertised 12.0000, actual 11.9910, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-15.timemachine/crf26-12fps-1424x800:\n",
" /0/0/0.mp4: 1498 frames, advertised 12.0000, actual 11.9909, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-03-20.timemachine/crf26-12fps-1424x800:\n",
" /0/0/0.mp4: 1508 frames, advertised 12.0000, actual 11.9909, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-04-01.timemachine/crf26-12fps-1424x800:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 1468 frames, advertised 12.0000, actual 11.9909, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-05-01.timemachine/crf26-12fps-1424x800:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 1508 frames, advertised 12.0000, actual 11.9909, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-06-01.timemachine/crf26-12fps-1424x800:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 1508 frames, advertised 12.0000, actual 11.9909, adv/act = 100.08%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-07-01.timemachine/crf26-12fps-1424x800:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 875 frames, advertised 12.0000, actual 11.9913, adv/act = 100.07%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"http://timemachine1.gc.cs.cmu.edu/timemachines/breathecam/timemachines/heinz/2014-08-01.timemachine/crf26-12fps-1424x800:"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.mp4: 1078 frames, advertised 12.0000, actual 11.9911, adv/act = 100.07%"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
" /0/0/0.webm: not found"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Code that's no longer needed:\n",
"-----------------------------"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"def get_fps_nframes(url):\n",
" try:\n",
" out = subprocess.check_output(['ffprobe', '-i', url, '-show_frames', '-select_streams', 'v'], stderr=subprocess.STDOUT)\n",
" except subprocess.CalledProcessError:\n",
" return (None, None)\n",
" nframes = len(list(re.finditer(r'\\[FRAME\\]', out)))\n",
" components = re.search(r'Duration: ([\\:\\.\\d]+)', out).group(1).split(':')\n",
" if len(components) != 3:\n",
" raise(\"Unrecognized format for duration\")\n",
" duration = 3600 * float(components[0]) + 60 * float(components[1]) + float(components[2])\n",
" print 'duration=%g' % duration\n",
" return (nframes / duration, nframes)"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 4
}
],
"metadata": {}
}
]
}