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• Unable to compile i386 compatible ffmpeg dylibs on Mac OS X

  9 mai 2013, par simon.d

  I'm running 64-bit Lion but I need to compile a 32-bit version of ffmpeg because another library I'm using is only available as 32-bit. I've tried a number of different configurations but they're all giving me errors. Here's what I've tried :

  ./configure —disable-static —enable-shared —disable-outdev=sdl —disable-bzlib —disable-libfreetype —disable-libopenjpeg —enable-zlib —enable-runtime-cpudetect —arch=i386 —extra-cflags="-arch i386" —extra-ldflags="-arch i386" —target-os=darwin —enable-cross-compile

  ./configure —disable-static —enable-shared —disable-outdev=sdl —disable-bzlib —disable-libfreetype —disable-libopenjpeg —enable-zlib —enable-runtime-cpudetect —arch=i386 —extra-cflags="-arch i386" —extra-ldflags="-arch i386"

  ./configure —disable-static —enable-shared —disable-outdev=sdl —disable-bzlib —disable-libfreetype —disable-libopenjpeg —enable-zlib —enable-runtime-cpudetect —arch=x86_32

  I either get a "ran out of registers during register allocation" error during make or gcc complains that cross-compile is not active.

• FFmpeg audio crossfade

  27 mai 2015, par chamath

  I’m trying to merge several videos using ffmpeg and apply the cross-fade transition in between. I got video cross-fade working by referring to this. At the same time I need to have audio also to have cross-fade applied for original audios associated with each video. I referred several places but they resulted,

  Buffer queue overflow, dropping.

  This, this and this are few i referred. I got the solution of this and this producing the output with concat option where the length of the audio is greater than the video. Though I used the exact fade values used in video it seams not working like in video.
  Following is the ffmpeg command I’m testing.

  ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4 -i 4.mp4 -i 5.mp4 -f lavfi -i color=black -filter_complex "
  
  [0:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=out:st=15:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va0];
  
  [1:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fade=t=out:st=30:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va1];
  
  [2:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fade=t=out:st=43:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va2];
  
  [3:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,fade=t=out:st=54:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va3];
  
  [4:v]scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2,format=pix_fmts=yuva420p,fade=t=in:st=0:d=2:alpha=1,setpts=expr=PTS-STARTPTS[va4];
  
  [5:v]scale=1280x720,trim=duration=69[over0];
  
  [0:a]afade=t=out:st=15:d=2,asetpts=PTS-STARTPTS[a0];
  
  [1:a]afade=t=in:st=0:d=2,afade=t=out:st=30:d=2,asetpts=PTS-STARTPTS[a1];
  
  [2:a]afade=t=in:st=0:d=2,afade=t=out:st=43:d=2,asetpts=PTS-STARTPTS[a2];
  
  [3:a]afade=t=in:st=0:d=2,afade=t=out:st=54:d=2,asetpts=PTS-STARTPTS[a3];
  
  [4:a]afade=t=in:st=0:d=2,asetpts=PTS-STARTPTS[a4];
  
  [a0][a1][a2][a3][a4]concat=n=5:v=0:a=1[outa];
  
  [over0][va0]overlay[over1];
  
  [over1][va1]overlay[over2];
  
  [over2][va2]overlay[over3];
  
  [over3][va3]overlay[over4];
  
  [over4][va4]overlay=format=yuv420[outv]" 
  
  -vcodec libx264 -preset fast -r 60 -b:v 45000k -aspect 1.78 -map [outv] -map [outa] -c:a libfdk_aac -ac 2 -b:a 128k -shortest test.mp4

  Also when i use the same asetpts as video it result the same issue mentioned above.
  What am I doing wrong here and is there any other method that I can use to have both video and audio cross-faded ?

• how to set Duration, framerate, bitrate etc for an empty video file without encoding frames, audio in it

  27 février 2019, par Deepak Prajapati

  My aim is that I have a video which do not contain any properties Details so i want to add properties to this video and make it playable

  enter image description here

  Look images, In properties detail section there is no property and there value
  please fix it because i tried to find solution
  Also i don’t have enough knowledge
  THANKS IN ADVANCE STACKOVERFLOW