Paul wrote:
> i have audio frame(s) and video frame in every cycle , then i want to
> write these to "output_media.mpg" file.
>
> Final, if the thought as above cannot make synch, Can you show me any
> way to sync audio and video?
[cc'ing ffmpeg-dev, as that was the original source of the message]
To interleave between video and audio, I have done the following. Assume
that you have an AVFormatContext for output and two AVStreams, one for
video, and one for audio.
for(;;) {
/* compute current audio and video time */
if (audio_steam)
audio_pts = (double)audio_stream->pts.val *
audio_stream->time_base.num / audio_stream->time_base.den;
else
audio_pts = 0.0;
if (video_stream)
video_pts = (double)video_stream->pts.val *
video_stream->time_base.num / video_stream->time_base.den;
else
video_pts = 0.0;
/* write interleaved audio and video frames */
if (!video_stream || (video_stream && audio_stream && audio_pts
< video_pts)) {
avcodec_encode_audio(...);
av_write_frame(...);
} else {
avcodec_encode_video(...);
av_write_frame(....);
}
}
When you initialize the AVFormatContext (for output) and the AVStreams,
the values in the PTS field will be null. This code assumes you are
starting at zero time, and moving forward. As each frame is encoded, the
AVStream's pts.val will be updated. This allows you to write the frames
interleaved together in a single output file.
You will have to handle, via buffering, the capture of the raw audio
data and raw video data so you do not lose any frames. However, on a
suitably fast machine, the encoding should be able to encode the frames
and write in real time.
Regards,
Paul
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