x264 picture and sound out of sync

Marty111 wrote on 9/29/2019, 7:36 PM

Good morning everyone!

I finally tried the x264 codec instead of the xvid codec I was using before to be able to render a video with 24bit/48khz audio in Vegas Pro 15. But on the rendered video, picture and sound are out of sync. The soundtrack is ahead of video content by a lot (maybe 1 or 2 seconds). No clue why.

Here are the settings I'm using :
Video for windows
HD 720-60p, using Sony YUV codec. OpenDML compatible
Video format : x264vfw - h.264/MPEG-4 AVC codec
Framerate : 25
Audio: PCM uncompressed 24bit /48khz stereo.

Thanks if you can help.

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3d87c4 wrote on 9/30/2019, 7:10 PM

FWIW: I've been using x264VFW to render 360 VR videos.

The audio/video sync issue is a known problem. I'm probably paraphrasing this wrong, but my understanding is the audio gets processed directly by Vegas, but the video goes to an external process, and these two get out of sync.

The work around is to render the video to a separate file then combine the audio and video files using FFMPEG.