Get duration base on the audio track about javacv HOT 9 CLOSED

It seems like it should work if the imageWidth and imageHeight is 0 so that it 
would call super.getFrameNumber(), but it is always returned 0 since it was 
never incremented in super. 

(also note that audio_c.frame_number() is always much bigger than 
picture.pts().. not sure which one to use. )

The following change works. :) 

private int audio_clock; 

    @Override
    public long getTimestamp() {
        if (picture == null) {
            return (audio_clock * 1000000L) / sampleRate;
        } else {
            return Math.round(getFrameNumber() * 1000000L / getFrameRate());
        }
    }


    boolean record(AVFrame frame) throws Exception {
        int ret;

        av_init_packet(audio_pkt);
        audio_pkt.data(audio_outbuf);
        audio_pkt.size(audio_outbuf_size);
        if ((ret = avcodec_encode_audio2(audio_c, audio_pkt, frame, got_audio_packet)) < 0) {
            throw new Exception("avcodec_encode_audio2() error " + ret + ": Could not encode audio packet.");
        } else {
            if(frame != null){
                this.audio_clock += frame.nb_samples();
            }
        }

Hi wzsddtc,

I have same problem that images and it is much slower than audio recording, So 
would you please advice me to fix this problem, maybe some sample code(I'm very 
newbie in development).

Thanks so much!

Yes, you are right, forgot about timestamps of audio frame. Should be fixed 
with this update:
http://code.google.com/p/javacv/source/detail?r=a38bec82311333d7ae7d06decdd4a2af
e7c92455
Thanks!

Thanks for the update. This should be added to FFmpegFrameRecorder as well, do 
you know  how to set a timestamp on the audio track (to skip audio samples) in 
addition to the frame number?

Are you really talking about FFmpegFrameRecorder? I'm not sure I understand the 
use case then. I'm also not sure about the technically feasible of what you are 
asking. Do you have any reference about what it is exactly you are looking to 
accomplish? A message thread from the FFmpeg mailing list perhaps? Thanks!

This case should be closed. Audio timestamps can be grabbed by calculating how 
many samples are calculated already in FFmpegFrameRecorder OR how many samples 
are grabbed in FFmpegFrameGrabber. :) 

Ok, sounds good :) I was under the impression that you were trying to skip 
audio frames on record(). This makes sense for video (we get variable frame 
rate), but I wasn't sure how that would make sense for audio...