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• webm to mp4 without loosing audio video sync

  9 avril 2018, par Kishore

  Iam trying to covert webm to mp4 using ffmpeg so that the output file is playable in all browsers.

  Iam using this ffmpeg command in ubuntu

  ffmpeg -i inpput.webm -f mp4 -copyts -vcodec libx264 -strict -2 -vf scale="380:-2" -pix_fmt yuv420p -profile:v baseline -level 3 output.mp4 

  It is converting the file to mp4 but that file is out of sync in Mac safari browser and chrome browser. Means the audio and video is not syncing and sometimes the video gets stopped in between and audio goes on.

  If I play the input.web media file directly in chrome it is playing perfectly fine, the same input.webm is also playing good with firefox. But the converted mp4 is out of sync in safari on mac and all chrome browsers.

  However if the output.mp4 is played on ipad safari it is playing fine.
  The Mac safari version I tried is 11.03
  iPad safari version is 11.3

  Firefox and chrome are all latest.

  firefox : 59.0.2(64 bit),
  chrome : 65.0.3325.181 (Official Build) (64-bit)

  Please help me out with what Iam doing wrong.

  Thanks in advance.

• OpenCV error : [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls

  2 mai 2015, par Relax Wu

  I installed OpenCV in Ubuntu according to the official guide, then I’m trying to decode a file, then error occurs :

  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!
  
  [mpeg4 @ 0x7ffe33cb3e60] too many thread_release_buffer calls!

  the video is about 150 frames, the error log may exceed 1000, can someone help me here ? thanks.

• FFmpeg scaling error

  9 juillet 2015, par oleg.semen

  I’m trying to convert video on Android using FFmpeg Android Java library
  My method takes input and output file pathes and dimentions of output file (for instance 640x480). Video should fit crop these bounds. As video might be in landscape or portrait orientation I’m next params :

  String.format("-i %s \"scale='if(gt(a,1),-1,%d)':'if(gt(1,a),%d,-1)'\" %s", in, h, w, out);

  see this article

  according to official doc a is aspect ration (w/h) of input file.

  So a > 1 gt(a,1) means w > h so video is landscape, and 1 > a gt(1,a) means h > w so video is portrait.

  But I’m getting next error :

  Unable to find a suitable output format for "scale='if(gt(a,1),-1,480)':'if(gt(1,a),640,-1'"
  
  '"scale='if(gt(a,1),-1,480)':'if(gt(1,a),640,-1'" : Invalid argument

  What am I doing wrong ?
  Thanks.