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I'm no expert but I have a similar problem like yours and in your code
below is a thinking error, I think. The example.c encodes frames not on
a specific time like 25times a second but as fast as it could, so the
below method is called more than once per frame. Therefore the encoding
can be made twice once for audio and once for video, or even more often
for both on one frame.
Your code below encodes one audio frame then one video frame than one
audio frame, because its called only once every 40ms. I can't give you
the right way to do it because I am stuck on the same problem, but you
can try to simply encode both at the same time and not caring about the
pts value:
void timerCB() {
if (obj->GetAudioStream()){
obj->EncodeAudioFrame();
}
if (obj->GetVideoStream()) {
obj->EncodeVideoFrame();
}
}
and hope that your number of audio samples is the same like the video
samples, if not you are stuck on the same problem like I am (you can
work around that by using a pcm codec (e.g. CODEC_ID_PCM_S16BE) but its
no real solution)
Regards
Simon
Franco Amato schrieb:
> Hi to all,
> I'm encoding video and audio. For video I encode frames extracted from my
> real-time simulation
> and for audio I encode "what I'm listening".
> For video I "extract and encode" a frame every 40ms to obtain 25fps.
> The problem come when I try to also encode audio. My sound card play sound
> at 48000 samples/s
> so I set the sample_rate param of the encoder to 48000 and I do this test
> (copied from output_example.c)
>
> //this routine is called 25 times/second
> void timerCB(void *data, SoSensor *sensor)
> {
> MovieRecorderIv *obj = (MovieRecorderIv *)data;
>
> /* compute current audio and video time */
> if ( obj->GetAudioStream() ){
> audio_pts = (double)obj->GetAudioStream()->pts.val *
> obj->GetAudioStream()->time_base.num /
> obj->GetAudioStream()->time_base.den;
> }
> else
> audio_pts = 0.0;
>
> if ( obj->GetVideoStream() )
> video_pts = (double)obj->GetVideoStream()->pts.val *
> obj->GetVideoStream()->time_base.num / obj->GetVideoStream()->time_base.den;
> else
> video_pts = 0.0;
>
> /* write interleaved audio and video frames */
> if (!obj->GetVideoStream() || (obj->GetVideoStream() &&
> obj->GetAudioStream() && audio_pts < video_pts)){
> obj->EncodeAudioFrame();
> }
> else{
> obj->EncodeVideoFrame();
> }
> }
>
> If I also encode audio as in the example above the created mpeg file run
> much faster that original, instead If I only encode video
> it run at the same fps of the original.
> I have some problem to solve my problem, can I have a help?
>
> Regards,
> Franco
>
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