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?
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Answer
Finally solved the issue by appending silent space to the beginning of each audio following first one. This will mix the audio one after the other.
[0:a]afade=t=out:st=15:d=2[a0]; [1:a]afade=t=in:st=0:d=2[a1]; aevalsrc=0:d=15[s1]; [s1][a1]concat=n=2:v=0:a=1[ac1]; [a0][ac1]amix[a]