Massive A/V sync issue on LE11 Nightly

Hello!

This is a problem that has happened a few months earlier on the nightlies and that got fixed, but it is coming back. Well, it may be a different cause with similar results.

Some streams or files nearly instantly develop massive A/V sync delays. By massive, I mean a few seconds, very rapidly. There is a forceful sync happening once in a while, with a video pause, and then it prodigiously drifts again.

This debug log was captured while playing 3 different videos:

1. a local file, mp4 container, avc video, aac audio - massive drift, 2 A/V sync events
2. a BBC iPlayer (iPlayer_www official add-on) stream - massive drift, 1 A/V sync event
3. A local file, MKV container, H.264 video, E-AC3 audio - No drift, in sync, always

Debug log / pastekodi: https://pastebin.ubuntu.com/p/Ch9J5mPYgh/

Raspberry Pi 4 4 GB RAM

dual headed - HDMI1 to 4K TV, HDMI2 to old AVR - fixed EDID files

LibreELEC nightly-20211122-599fb05 (RPi4.arm)

If you need anything else, shoot, I'm standing-by!

Nico

Quote from popcornmix

It's always useful to report when an issue starts with nightlies. If you can report a latest good and oldest bad build it might help narrow it down.

I've gone back in time.

Which reminded me of one thing... The bad A/V sync on some videos started when a bad video start (audio start but black screen for 10s) issue got fixed (I didn't report it, it lasted for a week or two, please don't ask me to go back in time that far!).

I remember reading this and thinking "that may fix my bad video start..." and it did: https://github.com/LibreELEC/LibreELEC.tv/pull/5888 This may be completely unrelated, I'm a numpty.

I'm hoping that will help!

Nico

I will provide a debug log in 30min or so for nightly-20211119-5e534d

This debug log was captured while playing 3 different videos, using nightly-20211119-5e534d

1. a local file, mp4 container, avc video, aac audio - massive drift, 2 A/V sync events
2. a BBC iPlayer (iPlayer_www official add-on) stream - massive drift, 1 A/V sync event
3. A local file, MKV container, H.264 video, E-AC3 audio - No drift, in sync, always

Debug log / pastekodi: https://youplala.net/~nico/le10-bad…di-20211119.txt

Video 1 made the system very angry: no video or sound, screen flickering somehow

Video 2: 10+ s until the video comes on after a black screen. THERE ARE BAD A/V SYNC issues!

Video 3: 10+ s until the video comes on after a black screen. No a/v sync issues

So, worse than I thought previously!

Sample video: https://youplala.net/~nico/le10-bad-video/sample.mp4

Using 20211122-599fb05.

debug log with this sample on local SD card: http://ix.io/3G0A

The very big A/V sync issue is the same from the SD Card.

FWIW, nightly-20211124-7ef3241 is the same as 20211122-599fb05. I've just checked.

oh crap... The whitelist... What a dummy! So sorry!

I had forgotten to recreate it after a complete reinstall due to a card gone bad...

Yes, the whitelist fixes it!

I will also reapply the force_turbo=1

Thanks, and sorry again for the trouble