#387 The Audio-Video Sync Disorder

[Okan Ozcelik]

In the first 20 minutes of a video, an audio-video sync problem cannot be noticed. But in the next minutes, it starts to get disorder of sync. Audio-visual delay increases to 5-10 seconds. I enable the Zero Latency feature of x264. Still getting disorder of sync.

But I am not sure that there is disorder of sync if when compressing video or when capturing video. Because I had programmed my program to delete the captured video after compressing the video. I use VirtualDub2 to capture videos for about 2 hours. Then it compresses the videos.

I am using VirtualDub2 with its default settings. I did not change a setting. What could be the cause of the audio-video sync disorder? Which setting should I change?

I was using VirtualDub1 the same way. I was not encountering such disorder of sync in VirtualDub1.

[Okan Ozcelik]

Hi,

Let me add the following information too;

Capture Mode:

FPS: 60
I use it to capture video from satellite broadcast. Do I need to lower the FPS rate? But the device may not allow it.

Compression: No Recompression
Audio Compression: No Compression (PCM)

Results of my 3-4 minute video capture attempt:
Frames dropped: 0
Frames inserted: 6 (maximum)

[Okan Ozcelik]

It looks like it is necessary to use FFMpeg / x265 as Codec. And ZeroLatency should be selected for Codec's Tune feature. Audio-video will can not be synchronized when other Codecs are selected, unfortunately.

https://sourceforge.net/p/vdfiltermod/tickets/176/

[Okan Ozcelik]

Select stereo was required in the sound priority feature of the satellite receiver.