Raspberry Pi display

Testing

Scope

The aim of the testing is to determine a viable combination of HW accelerations and/or display to be able to fluidly decode H.264 stream on Raspberry Pi. Also current state of UltraGrid is evaluated.

Tested SW:

• UltraGrid
• FFMPEG (ffplay)
• mpv
• (mplayer?)
• omxplayer

Setup

• Raspberry Pi 3 Model B
• Raspbian Buster with desktop
• 256 MB video RAM (gpu_mem=256)
• G3 GL (Full KMS) OpenGL desktop driver with full KMS (dtoverlay=vc4-kms-v3d)

Results

File playback (New Zealand 4K transcoded to 1080p H.264 @10 Mbps)

• omxplayer + G1/G2 - smooth
• omxplayer + G3 - doesn't work
• ffplay -vcodec h264_mmal + G1 - strobbing
• ffplay -vcodec h264_mmal + G3 - smooth
• ffplay -vcodec h264_v4l2m2m + G1/G3 - works but no rendering
• ffplay and mpv + G3 - smooth
• ffplay and mpv + G2 - doesn't work
• mpv + G1 - slow

Note: HW acceleration work with G3 GL, not G1 (G2 not tested)!

UltraGrid (as for 10th Sep 2019),

• uv -d gl --param force-lavd-decoder=h264_v4l2m2m - crashes
• uv -d gl --param force-lavd-decoder=h264_mmal - something like 8 FPS
• uv -d sdl --param force-lavd-decoder=h264_mmal - 7 FPS
• uv -d sdl:renderer={1,2} --param force-lavd-decoder=h264_mmal (GLES renderers) - 9 FPS
• other drivers than X11 (RPI or wayland) didn't work

References

• Related Issue
• Device-Settings#Raspberry_Pi