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• Access to macroblocks and motion values with libx264

  6 mars 2019, par Enock

  I have a question and I hope someone can help me.
  I want to extract all motion vectors in P_type mocroblock in a P_frame during encoding
  h264 video with libx264 (x264). libx264 uses X264Context in the function x264_frame to encode
  video. Then, I want to know how can I access to macroblocks in a picture and
  how to access to motion vectors table on this picture while using the X264Context struct.
  With MpegEncContext we can access them while using MpegEncContext struct’s mb_type, *mvs[2], mb_width, mb_height and mb_stride. But I don’t know how to have such informations (
  mb_type, *mvs[2], mb_width, mb_height and mb_stride) with X264Context struct.

  Please I need your help.

  Regards

• Running ffmpeg through a website

  18 novembre 2013, par Andrew Simpson

  I have a website and it allows Users to download images as a video clip.

  They can choose from say mp4, avi, ogg etc.

  I use ffmpeg via the Process Class in C#/Asp.net 4.0 to execute the conversion tool.

  I have noticed in testing that if I forcefully abort this conversion like stopping IIS, ending the wp3 process in task manager) that after a while of doing this if I then look at task manager on the Web Server there are many instances of FFMPEG which have not closed down properly.

  What I would ideally like to do is kill any processes that maybe lingering for that SPECIFIC User (not any other Users/Session) and then start the conversion tool.

  Is it possible to manage/control the FFMPEG process for that User/Session or should I be looking at a queuing system that enables only 1 User at 1 time should be able to use this conversion tool ?

  I hope I made this sound clear ?

  I could post the code that shows how the Process/ffmpeg is started in C# but I cannot see how this would aid this question.

  Thanks

• How does wrap_unicode option work when ffmpeg renders subtitles

  12 septembre 2024, par Bazinga

  This is my complete command, which accepts the wrap_unicode option, but the option is not working

  


  '/usr/local/ffmpeg/bin/ffmpeg' '-y' '-i' 'input.mp4' '-threads' '12' '-vcodec' 'libx264' '-acodec' 'aac' '-b:v' '1000k' '-refs' '6' '-coder' '1' '-sc_threshold' '40' '-flags' '+loop' '-me_range' '16' '-subq' '7' '-i_qfactor' '0.71' '-qcomp' '0.6' '-qdiff' '4' '-trellis' '1' '-b:a' '128k' '-vf' '[in]subtitles=test.srt:wrap_unicode=1:force_style='\''FontSize=12,FontName=Angsana New,PrimaryColour=&H00FFFFFF,BorderStyle=1,Outline=0.5,Shadow=1,MarginV=50'\''[out]' '-pass' '1' '-passlogfile' '/var/folders/xh/0xpfqmh57hb12ffvs5wy1v0w0000gn/T/ffmpeg-passes66e24b16ea0aa/pass-66e24b16ea47b' 'output.mp4'


  


  Before that, I compiled libunibreak, libass(0.17.0) in order, and reinstalled ffmpeg.

  


  I hope someone can help me understand where the problem caused this option to not take effect, this problem has been bothering me for some time, thank you very much !