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• New FATE Test Coverage System

  10 août 2010, par Multimedia Mike — FATE Server

  I’ve been feeling a bit scattered for the last week since I was fired from my volunteer position as the FFmpeg QA manager, wondering if there is anything I should attempt to do with the project. It can’t be denied that the new system is working well. But one area I’ve wondered about is test coverage.

  Under my old regime I tracked test coverage as a wiki page which was a highly flawed method— tedious and error-prone. There are those 2 adjectives again— tedious and error-prone ; whenever I see those, I search for automation methods. I think that might be more plausible thanks to the new FATE’s tighter integration with the FFmpeg build system.

  I don’t think anyone is working on this problem so I wanted to toss out a brainstorm :

  1. First, run ’ffmpeg -formats’, ’ffmpeg -codecs’, etc. and parse the output to collect a list of all the features (full list : -formats, -codecs, -bsfs, -protocols, -filters, -pix_fmts). Transform these lists into a standardized list of features, e.g., "DEVSD  ffvhuff         Huffyuv FFmpeg variant" represents features ’decode-video-ffvhuff’, ’encode-video-ffvhuff’, ’ffvhuff-horizband’, and ’ffvhuff-dr1’.
  2. Next, tag each individual test spec with the features that it exercises. E.g., test ’fate-vqa-cc’ exercises features ’demux-wsvqa’, ’decode-video-vqavideo’, and ’decode-audio-adpcm_ima_ws’.
  3. Finally, compare the data from parts 1 and 2. Print a list of all the features that are not exercised in FATE.

  I think a lot of this could be implemented at the GNU make level. Then again, I’m no expert on GNU make syntax so I may be overestimating its capabilities. Or there might be simpler ways to automatically track test coverage stats based on the improved testing infrastructure.

• Setting start date in gource

  5 juin 2014, par rfc1484

  I’m trying to run gource from a certain date, but it reports me a ’codec not found error’.

  This is the command without a start date :

  gource -1280x720 --seconds-per-day 1 --stop-at-end --hide filenames --hide files --git-branch master --camera-mode track --output-ppm-stream - | ffmpeg -y -b 3000k -r 25 -f image2pipe -vcodec ppm -i - test.mp4

  Which works fine and generates the .mp4 file as expected.

  This is the command with a start date :

  gource -1280x720 --start-date '2014-01-01' --seconds-per-day 1 --stop-at-end --hide filenames --hide files --git-branch master --camera-mode track --output-ppm-stream - | ffmpeg -y -b 3000k -r 25 -f image2pipe -vcodec ppm -i - test.mp4

  Which doesn’t work and generates the following error message :

  [image2pipe @ 0x78a600] Could not find codec parameters (Video : ppm)

  Any suggestions on how to fix this ?

• iPhone HTTP Streaming .m3u8 and .ts files - how to create using ffmpeg

  8 septembre 2013, par ChessDev

  I'm trying to get apple-validated http media streams using ffmpeg and am getting errors. Here are some error examples :

  WARNING : Playlist Content-Type is 'application/x-mpegurl', but should
  be one of 'application/vnd.apple.mpegurl', 'audio/x-mpegurl' or
  'audio/mpegurl'.

  WARNING : 258 samples (88.966 %) do not have timestamps in track 256
  (avc1). 4 : us2-1.ts
   

  WARNING : Media segment duration outside of expected duration by 47.733
   % (5.23 vs. 10.00 seconds, limit is 20 %). 40 : us2-19.ts
   

  Average segment duration: 10.16 seconds
  
  Average segment bitrate: 320.12 kbit/s
  
  Average segment structural overhead: 175.89 kbit/s (54.94 %)
  
  
  
  Video codec: avc1
  
  Video resolution: 320x320 pixels
  
  Video frame rate: 29.72, 29.78, 29.82, 30.00, 29.64 fps
  
  Average video bitrate: 100.66 kbit/s
  
  H.264 profile: Baseline
  
  H.264 level: 3.0
  
  
  
  Audio codec: aac 
  
  Audio sample rate: 48000 Hz
  
  Average audio bitrate: 43.57 kbit/s

  ---

  Here is the end file I've been submitting : http://files.chesscomfiles.com/images_users/using/us2.m3u8

  Here is the file I used to create this : http://files.chesscomfiles.com/images_users/using/using-computers-1.mp4

  I've tried these commands, among others :

  ffmpeg -i using-computers-1.mp4 -f mpegts -acodec libfaac -ar 48000
  -ab 64k -s 320x320 -vcodec libx264 -vbsf h264_mp4toannexb -b 96k -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 2 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate 96k -bufsize 96k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -g 30 -async 2 us2.ts

  ffmpeg -i using-computers-1.mp4 -f mpegts -acodec libfaac -ar 48000
  -ab 64k -s 320x320 -vcodec libx264 -vbsf h264_mp4toannexb -b 96k -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate 96k -bufsize 96k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -g 30 -async 2 us1.ts

  ffmpeg -i using-computers-1.mp4 -vbsf h264_mp4toannexb -acodec copy -vcodec copy -f mpegts output.ts

  If someone can help me figure out what ffmpeg commands I should be running I'd really appreciate it !