Encoding from network takes ages compared with FFmpeg-mobile library

[buntupana]

I'm using this command to encode a video from web:

-y -reconnect 1 -i https://snapcellvideos.s3.amazonaws.com/manual/24/manualupload_16098586962947166522.mp4 -filter_complex "[0:v] pad=iw:'if(gt(iw, ih), iw, ih)':(ow-iw)/2:(oh-ih)/2, crop=iw:iw, scale=-1:480, setsar=1 [clip0]; [0:a] anull [audio0]; [clip0][audio0] concat=n=1:v=1:a=1 [v][a]" -map '[v]' -map '[a]' -c:a aac -c:v h264 -crf 18 -r 30 -preset veryfast /output_path/output_file.mp4

With FFmpeg-mobile library it takes around 100 seconds to encode it but with FFmpeg-kit it takes 639 seconds

I've check with local videos and it takes the same aprox, so the problem is related to videos from web

Version: com.arthenica:ffmpeg-kit-full-gpl:4.4.LTS

[tanersener]

Thanks for reporting this. I see the same issue as well but I'm not sure about the reason. I need to run some tests to understand what is happening there.

[tanersener]

My tests show that this commit, 70d8077b795766e2486e6ec8110f22a97362d6d6, on ffmpeg master is responsible of this performance decrease. And it affects all architectures, not only Android. iOS, tvOS and macOS also have the same problem while downloading large files over https.

Ideally, this issue must be reported to ffmpeg and fixed there. But, I couldn't reproduce it on the desktop version of ffmpeg. So, I patched the files updated on that commit for now. If it is not fixed before the next release I'll use that patch to fix this issue.

[buntupana]

Cool, thanks a lot.

[tanersener]

Created this ticket on ffmpeg for this issue, https://trac.ffmpeg.org/ticket/9148.

ffmpeg devs area already on it. Could you leave the file there a bit longer so they can work on the fix?

[buntupana]

Sure, no problem.

[tanersener]

This issue is fixed on ffmpeg. Updated the development branch with the latest commit from ffmpeg master. So, we will have the fix on the next release.

[tanersener]

Fixed in v4.5 release.