Livio Tenze (12021-02-23): > I am following your suggestion. I added one thread to acquire the audio > stream. Currently I have only the thread for the audio stream; I will > implement threads also for video acquisition. > The see a strange behaviour: > =============================================== > Crop frame system is 1 > Dummy read one frame > VIDEO PTS START from video1 > AUDIO: void AudioInputThread::startLoop() > AUDIO: audioThread started NOW! > PTS START video: 83565572 audio: -1 > stream v:1/15360 a:1/22050 > AUDIO: audio: 0.000 0.185759 = 0.186 1614099985303395 > set record for 15.00 minutes > AUDIO: head 0, tail 1 > start recording > AUDIO: audio: 1.840 0.185759 = 2.026 1614099987143524 > AUDIO: head 0, tail 2 > AUDIO: audio: 2.068 0.185759 = 2.253 1614099987371002 > AUDIO: head 0, tail 3 > AUDIO: audio: 1.735 0.185759 = 1.920 1614099987037933 > AUDIO: head 0, tail 4 > AUDIO: audio: 1.476 0.185759 = 1.662 1614099986779509 > AUDIO: head 0, tail 5 > AUDIO: audio: 1.293 0.185759 = 1.479 1614099986596620 > AUDIO: head 0, tail 6 > AUDIO: audio: 1.116 0.185759 = 1.302 1614099986419398 > AUDIO: head 0, tail 7 > video1: 0.032 83597620 33333 > >>> video timer0 0 > >>> video timer1 20 > =============================================== > Please, take into account lines starting with "AUDIO: " tag. > This is a log of my application. I notice that the audio estimated position > (it is estimated taking into account the first received pts) starts > increasing, then decreases, and, after some packets, the behaviour is > monotonic and right. Moreover, the distance from the starting PTS and the > second one is almost 2 seconds. > Have you any suggestions about this strange behaviour?
I am sorry, but I do not think I can help with that: I have no idea what these numbers are supposed to mean. In the meantime, I notice that you have not checked if you had buffer overruns in ALSA, and that you have not determined the origin of your timestamps. Regards, -- Nicolas George
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