Recently i got an issue on my RPi4 with a VLC media player that was crashing if i was trying to switch between a fullscreen and a windowed mode and scroll a video.
Also i couldn’t play some movies as the VLC was playing the audio track only but not the video one.
In the both cases if i was running the VLC from a terminal there were errors about some failures to allocate buffer objects from a CMA.
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Raspberry Pi: VLC – Failed To Allocate CMA Buffer
If the VLC media player on the Raspberry Pi is crashing with the errors as follows (mainly while switching between a fullscreen and a windowed mode):
DRM_IOCTL_MODE_CREATE_DUMB failed: Cannot allocate memory Failed to create scanout resource usrvcsm: [vcsm_malloc_cache]: [VLC frame]: ioctl mem-alloc FAILED [-1] (hdl: 0) [9f331378] mmal_codec filter error: Failed to alloc CMA buf: fmt=Z420, size=1044480 Segmentation fault
Or if is playing the audio only but not the video track with the errors like these:
[000bd658] main audio output error: cannot setup filtering pipeline [a8b2bae0] main decoder error: failed to create audio output usrvcsm: [vcsm_malloc_cache]: [ffmpeg uncached]: ioctl mem-alloc FAILED [-1] (hdl: 0) Unable to alloc 2219520 bytes from VCSM for ffmpeg uncached [hevc @ 0xa8b49d60] Failed to allocate col mv buffer [hevc @ 0xa8b49d60] Failed setup for format rpi: hwaccel initialisation returned error [a8b0f1b0] mmal_avcodec decoder error: Frame has no attached CMA buffer [a8b0f1b0] main decoder error: buffer deadlock prevented
I got resolved both of these issues on my RPi4 by starting a raspi-config and selecting the OpenGL driver:
$ sudo raspi-config
Go to “Advanced Options” → “GL Driver” and select the “GL (Fake KMS) OpenGL desktop driver with fake KMS”.
Reboot the Raspberry Pi to apply the modifications.
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