Audio Stutter on RaspPi 1 B+

ramonrue · May 30, 2018 at 9:17 PM

Hi,

Recently installed Libreelec with Kodi 18 (from popcornmix (or something like that ) source) as I needed a few features from kodi 18.

I'm having problems playing video files. I'm using audio passthrough through HDMI (PCM output does not work as the CPU is too slow) and access the files via NFS.

The audio does not start to stutter until a few seconds in (like, 10?), but that's what I get in the debug log when the audio starts to stutter:

Code

20:05:20.403 T:1385194352 WARNING: CRenderManager::WaitForBuffer - timeout waiting for buffer
20:05:20.425 T:1938939920   DEBUG: CMMALRenderer::RenderUpdate - vsync 5645 (+4)
20:05:20.525 T:1385194352 WARNING: CRenderManager::WaitForBuffer - timeout waiting for buffer
20:05:20.720 T:1938939920 WARNING: Previous line repeats 1 times.
20:05:20.720 T:1938939920   DEBUG: CRBP::WaitVsync no  vsync 5663/5664 display:10000030(10000030) delay:0
20:05:20.720 T:1938939920   DEBUG: CMMALRenderer::RenderUpdate - vsync 5664 (+-1)
20:05:20.752 T:1385194352 WARNING: CRenderManager::WaitForBuffer - timeout waiting for buffer
20:05:20.756 T:1938939920   DEBUG: CMMALRenderer::RenderUpdate - vsync 5664 (+4)
20:05:20.761 T:1572406128   DEBUG: CVideoPlayer::OMXDoProcessing Pause 3.00,0.08 (A:01 V:10) EOF:0 FULL:0 T:0.40
20:05:20.761 T:1572406128   DEBUG: OMXClock::OMXSetSpeed(0.000) pause_resume:1
20:05:20.770 T:1572406128   DEBUG: CVideoPlayer::OMXDoProcessing Resume 3.03,0.07 (A:01 V:10) EOF:0 FULL:1 T:0.40
20:05:20.770 T:1572406128   DEBUG: OMXClock::OMXSetSpeed(1.000) pause_resume:1
20:05:20.778 T:1938939920   DEBUG: CMMALRenderer::RenderUpdate - vsync 5669 (+1)
20:05:20.875 T:1385194352 WARNING: CRenderManager::WaitForBuffer - timeout waiting for buffer
20:05:20.999 T:1572406128 WARNING: Previous line repeats 1 times.
20:05:21.000 T:1572406128   DEBUG: CVideoPlayer::OMXDoProcessing Pause 3.06,-0.07 (A:01 V:10) EOF:0 FULL:0 T:0.80
20:05:21.000 T:1572406128   DEBUG: OMXClock::OMXSetSpeed(0.000) pause_resume:1
20:05:21.024 T:1572406128   DEBUG: CVideoPlayer::OMXDoProcessing Resume 3.06,-0.07 (A:01 V:10) EOF:0 FULL:1 T:0.80
20:05:21.024 T:1572406128   DEBUG: OMXClock::OMXSetSpeed(1.000) pause_resume:1
20:05:21.108 T:1385194352 WARNING: CRenderManager::WaitForBuffer - timeout waiting for buffer
20:05:21.224 T:1572406128 WARNING: Previous line repeats 1 times.

Display More

The file is an .mkv file with Dolby Digital, although the same happens for DTS tracks.

Does not matter if the movie is Full HD or HD, also, CPU usage is around 60% when playing the file, so it's not that either.

Found this thread of an OMSC image, which sounds kinda similar (not sure if related though): Playback Video - sound stuttering after March 5th Update - Raspberry Pi - OSMC Forums

Also played around with the cache settings in advancedsettings.xml, but could not produce different results with different buffermodes.

Any help appreciated

**DaVu** · May 31, 2018 at 7:48 AM Official Post

we would help, if you would have provided a full debug log. If you don't, we can't help at all

Those snippets from above don't help at all. Also the reference to OSMC doesn't help as OSMC is a completely different distro.

Please provide a full logfile at pastebin.com. So we can at least be sure what you might have installed

**chewitt** · May 31, 2018 at 10:14 AM Official Post

K18 defaults to the MMAL decoder but you can still use OMXplayer, and on RPi1 hardware you probably need to only use OMXplayer.

ramonrue · May 31, 2018 at 7:02 PM

Sorry, full debug log here.

I disabled the hardware acceleration for MMAL, to make sure it runs with OMXPlayer. The debug log should thus be with OMXPlayer.

When disabling HW-Acceleration for OMX, but enabling for MMAL, kodi crashes.

If I should be wrong about the player selection, how can I select one or another player?