trim video

[djp0507]

I want to trim video in Android like “ffmpeg -ss 0:1:30 -t 0:0:20 -i input.mp4 -vcodec copy -acodec copy output.mp4 ”，but the ffmpeg.h does not exist .
what should i do？ Thank you

[saudet]

It's not exactly the same thing, but we can do something like this:

FrameGrabber grabber = new FFmpegFrameGrabber("input.avi");
grabber.start();
grabber.setTimestamp((1 * 60 + 30) * 1000000);

FrameRecorder recorder = new FFmpegFrameRecorder("output.mp4");
recorder.setFrameRate(grabber.getFrameRate());
recorder.setSampleRate(grabber.getSampleRate());
recorder.start();

Frame frame;
while ((frame = grabber.grab()) != null && recorder.getTimestamp() < 20 * 1000000) {
    recorder.record(frame);
}
recorder.stop();
grabber.stop();

[pengliren]

-vcodec copy -acodec copy
no transcoding

[saudet]

@pengliren That's correct. But we could provide something like grabPacket() and recordPacket() methods to let user pass around packets without decoding them. Would you have some time to make the necessary modifications? Let me know, thanks!

[pengliren]

@saudet ok, you provide grabPacket() and recordPacket() methods, I will try modifications.

[djp0507]

@saudet It can, but time is too long.

[saudet]

Marking as a duplicate of #93

[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.