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• avcodec : Add "sar" alias to "aspect" option of video encoders

  5 mai 2016, par Andrey Utkin

  avcodec : Add "sar" alias to "aspect" option of video encoders
  It is impossible to pass "aspect" parameter to encoder from ffmpeg CLI
  
  because option from lavc/options_table.h is eclipsed by option with same
  
  name in ffmpeg_opt.c, which has different meaning (DAR, not SAR).
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] doc/codecs.texi
  • [DH] libavcodec/options_table.h
  • [DH] tests/ref/fate/api-mjpeg-codec-param
  • [DH] tests/ref/fate/api-png-codec-param

• when webm extracts aac, the duration is inconsistent

  25 juillet 2019, par Black-Hole

  When I try to extract aac from webm, there will be inconsistencies in duration. aac is ten minutes less. Different webm videos, the gap is not the same.

  webm video is generated by chrome extension chrome.tabCapture.capture

  code :

  chrome.tabCapture.capture({
  
    video: true,
  
    audio: true,
  
    videoConstraints: {
  
      mandatory: {
  
        minWidth: 1920,
  
        minHeight: 1080,
  
        maxWidth: 1920,
  
        maxHeight: 1080,
  
        maxFrameRate: 30,
  
        minFrameRate: 30,
  
      }
  
    }
  
  })

  The above code will return a stream, I will use JS’s MediaRecorder method to process this stream, and finally save it as a webm file.

  code :

  new MediaRecorder(stream, {
  
    audioBitsPerSecond: 128000,
  
    videoBitsPerSecond: 2500000,
  
    mimeType: 'video/webm;codecs=vp9'
  
  })

  If you don’t know the meaning of the above code, it doesn’t matter, I will explain the main information :

  1. width : 1920
  2. height : 1080
  3. FPS : 30
  4. audioBits : 128000
  5. videoBits : 2500000
  6. mimeType : video/webm;codecs=vp9

  I tried a lot of methods, like the following :

  # 1
  
  ffmpeg -i ./source.webm -y -fflags +genpts -max_muxing_queue_size 99999 -r 15 -crf 30 -filter:v crop=750:560:0:0 ./x.mp4
  
  ffmpeg -i ./x.mp4 -y -vn -acodec libfdk_aac -b:a 200k ./x.aac
  
  
  
  # 2
  
  ffmpeg -i ./source.webm -y -vn -acodec libfdk_aac -b:a 200k ./x.aac
  
  
  
  # 3
  
  ffmpeg -i ./source.webm -y -vn -acodec libfdk_aac -b:a 200k -map 0 ./x.aac
  
  
  
  # 4
  
  ffmpeg -i ./source.webm -y -max_muxing_queue_size 99999 -r 15 -crf 30 -filter:v crop=750:560:0:0 ./x.mp4
  
  ffmpeg -i ./source.webm -y -vn -acodec aac -b:a 200k ./x.aac
  
  
  
  # etc.

  But without exception, all failed. I have been plagued by this problem for 4 days.

  webm file download url : https://drive.google.com/file/d/1m4fC1hU-tXFPOZayrYCs-yteSTxw_TaW/view?usp=sharing

• Rotated video with ffmpeg doesn't play in flowplayer in IE9

  17 octobre 2013, par yoshi

  I have a script that rotates videos 90 degrees and then the videos are displayed on a web page using flowplayer (HTML5 version, not Flash). After the video is rotated once it does not play in IE9 but plays without any other problems in Chrome and Firefox.
  The error message is : Video file not found.

  I've looked in IE9's developer tools console, in the network tab and the browser streams the whole video.

  The following is the ffmpeg command I use to rotate and convert the video :

  ffmpeg -i input.mov -y -r 30 -b 4M -vf 'transpose=1,scale=800:trunc(ow/a/2)*2' -ar 48000 -vcodec libx264 -profile baseline -preset slow -level 2.2 output.mp4

  This is the input file which I used : https://dl.dropboxusercontent.com/u/37994/local%20capture.mov

  This is the output video : https://dl.dropboxusercontent.com/u/37994/local%20capture%20rotated.mp4

  The input video from above is a screen capture made using QuickTime on Mac OS.

  This also happened for this video : http://mirrorblender.top-ix.org/peach/bigbuckbunny_movies/big_buck_bunny_480p_h264.mov
  And also this one : https://dl.dropboxusercontent.com/u/37994/clipcanvas_14348_offline.mp4

  This didn't happen for the sample .mov from here : http://support.apple.com/kb/ht1425

  If I run the command twice, meaning I rotate the video 90 degrees and then I rotate the output using the same command once more, the problem disappears, but I need to be able to rotate only 90 degrees.

  This problem doesn't happen if I put IE9 in IE7 or IE8 compatibility mode.

  I was thinking that maybe the problem was how the server serves the video but there's no problem with other videos.

  I looked at the metadata with ffmpeg but didn't see anything significant.

  I already have AddType video/mp4 .mp4 in .htaccess.

  I can't seem to pin down what's causing this problem.

  Edit :

  Request in IE9
  

  Response in IE9