[CiNcH]

On my Sony Android TV, I have to set a negative audio delay (“Ahead by 0.225s”) for perfect lip sync. After doing so, I am experiencing a constant slight video judder. Setting audio offset back to 0 immediately resolves the judder.

I tried with Dolby passthrough and PCM audio, PVR (live) and file. The judder issue with the 225ms negative audio delay is always the same.

Player/output stats do not register any drops or repeats. I am attaching a debug log of a playback attempt with such a negative audio delay. The logging might change the video timing though.

[pastebin]

[FernetMenta]

I guess this is an Android specific issue and it's better to post this in the Android section of the forum.

[Klojum]

Thread moved to Android section.

[maxtherabbit]

I've noticed the same problem on the Nvidia Shield with Leia nightlies. On Krypton I used to use delay of -175 ms for good audio and video sync. With Leia I get the problem that CiNcH described if the delay is bigger than -100 ms. Between 0 ms and -100 ms the playback is fine.

[CiNcH]

On Krypton I used to use delay of -175 ms for good audio and video sync.

I can confirm that the Krypton based SPMCv17a2 also does not suffer from this problem.

The reduced A/V offset might lead to less frame buffering. Is it somehow possible to increase latency, shifting timestamps more into the future, filling up buffers more?

I can see the issue mainly on high frame rate content, like 720p50 sports broadcasts. I can provide a sample if needed.

[CiNcH]

Still having this issue. Is there any way to debug video timings in more detail? CTRL+SHIFT+O does not indicate a problem.

Probably @peak3d has an idea?

[CiNcH]

This build with this commit fixes the issue. Hopefully it will be pulled into official Kodi.