Support AVPacket to efficiently segment, trim, encode with hardware, stream multiple times, etc

[dheerajbhaskar]

I'm referring to the -segment_time in the command below

ffmpeg -i fff.avi -acodec copy -f segment -segment_time 10 -vcodec copy -reset_timestamps 1 -map 0 -an fff%d.avi

Above code grabbed from http://unix.stackexchange.com/questions/148602/ffmpeg-split-video-multiple-parts

I'm also aware of this feature being requested earlier https://groups.google.com/forum/#!topic/javacv/4wO6gODaq4w

[saudet]

It's possible to do it manually by grabbing the frames and recording only the ones we're interested in. But, to be more efficient, we would need to provide a way to bypass the decoding and encoding process, and pass the packets directly:
https://code.google.com/p/javacv/issues/detail?id=456
Is this a project you would like to work on?

[alicanalbayrak]

Hi samuel,
I tried to bypass decode and encode process, and it seems works so far. (Only records video packets for now)

Remuxer.java

[saudet]

@alicanalbayrak Cool! Could you include the necessary logic in FFmpegFrameGrabber and FFmpegFrameRecorder? I'm thinking we could provide additional grabPacket() and recordPacket() methods for that.

[alicanalbayrak]

Sure, I'll work on that. I'm planning to send you pull request in a few days.
.

[saudet]

The implementation from @alicanalbayrak is part of the just released version 1.2! Thanks for the contribution :)

[saudet]

FYI, if the ffmpeg program is sufficient, with commit bytedeco/javacpp-presets@13ffffd it now gets bundled and can be used easily from Java.