NPVR 4.2.4 Playback: Video way ahead of audio after few minutes

Reddwarf · (This post was last modified: 2019-03-09, 06:56 PM by Reddwarf.)

Just upgraded to 4.2.4 and discovered the above mentioned. MPEG1 audio and LAV decoder, renderer(s) set to default. Are there any obvious pitfalls I'm not aware of?

Edit: Funny, after reviewing settings and saving them things seems to work ok again... ??

Reddwarf · 2019-03-11, 03:25 PM

Turns out the problem is still there, but not consistently. I'm seeing often that picture/sound gets out of sync, especially if the computer is busy running comskip while I do playback. Even subtitles gets badly out of sync.

Is anyone else seeing this with version 4.2.4? It never happen in 4.2.3....

HarryH3 · 2019-03-11, 07:40 PM

I'm not seeing this with 4.2.4. Do you have hardware acceleration enabled in LAV Video Configuration? How about "Auto A/V Sync correction" in LAV Audio Configuration? I have both enabled. Program "starts", and right after Comskip jumps, my video is a couple of seconds ahead of the video for 2-5 seconds, then the video slows to a crawl until the audio is synced up. No problem again until the next skip or we start new program.

Reddwarf · 2019-03-12, 09:58 AM

HarryH3 Wrote:I'm not seeing this with 4.2.4. Do you have hardware acceleration enabled in LAV Video Configuration? How about "Auto A/V Sync correction" in LAV Audio Configuration? I have both enabled. Program "starts", and right after Comskip jumps, my video is a couple of seconds ahead of the video for 2-5 seconds, then the video slows to a crawl until the audio is synced up. No problem again until the next skip or we start new program.

Yep, both HW acceleration and Auto A/V Sync is ticked. I was seeing the behaviour you described in the previous version of NPVR. I have changed the settings for HW acceleration to DXVA Native, lets see if that helps.

Reddwarf · 2019-03-14, 01:27 PM

It seems that the problem occur only on some channels, changing decoder from LAV/LAV to Cyberlink/AC3Filter solves the problem. But it is kind of strange that the problem never occur in 4.2.3

Reddwarf · 2019-04-01, 03:30 PM

Turned out that I have to tick "use legacy NPVR TS reader" in order to get audio and video in sync on all channels. Sub, are you interested in a sample video that does not play well with the new reader?
Edit: Only applies to 4.2.4, 4.2.3 never had this issue.....

***sub*** · 2019-04-05, 03:21 AM

Yeah, I'll take a look at a sample video file.

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