[Libav-user] How to use rkmpp decoder?

[Mark Thompson]

On 12/04/18 10:24, Anton Prikazchikov wrote:
>>Did you already implement software decoding with libavcodec?
>>Once this works, you should only have to switch from the "h264"
>>decoder to the "h264_rkmpp" decoder to make it work.
> 
> I rebuilded my ffmpeg and now output:
> 
> Codec is initializated
> [NULL @ 0x20f35030] Opening '../4k.h264' for reading
> [file @ 0x20f356e0] Setting default whitelist 'file,crypto'
> [h264 @ 0x20f35030] Format h264 probed with size=2048 and score=51
> [h264 @ 0x20f35030] Before avformat_find_stream_info() pos: 0 bytes read:32768 seeks:0 nb_streams:1
> [AVBSFContext @ 0x20f3cd20] nal_unit_type: 6, nal_ref_idc: 0
> [AVBSFContext @ 0x20f3cd20] nal_unit_type: 7, nal_ref_idc: 3
> [AVBSFContext @ 0x20f3cd20] nal_unit_type: 8, nal_ref_idc: 3
> [AVBSFContext @ 0x20f3cd20] nal_unit_type: 5, nal_ref_idc: 3
> [h264 @ 0x20f36100] nal_unit_type: 6, nal_ref_idc: 0
> [h264 @ 0x20f36100] nal_unit_type: 7, nal_ref_idc: 3
> [h264 @ 0x20f36100] nal_unit_type: 8, nal_ref_idc: 3
> [h264 @ 0x20f36100] nal_unit_type: 5, nal_ref_idc: 3
> [h264 @ 0x20f36100] Format yuv420p chosen by get_format().
> [h264 @ 0x20f36100] Reinit context to 1280x544, pix_fmt: yuv420p
> [h264 @ 0x20f36100] no picture
> [h264 @ 0x20f35030] max_analyze_duration 5000000 reached at 5017667 microseconds st:0
> [h264 @ 0x20f35030] After avformat_find_stream_info() pos: 63488 bytes read:65536 seeks:0 frames:123
> [h264_rkmpp @ 0x20f37760] Initializing RKMPP decoder.
> mpi: mpp version: 5849089 author: Herman Chen [mpp]: Add temporally patch for blocking issue
> hal_h264d_api: hal_h264d_init mpp_buffer_group_get_internal used ion In
> mpp_rt: NOT found ion allocator
> mpp_rt: NOT found drm allocator

The ffmpeg implementation requires DRM.  Make sure that mpp is built with -DHAVE_DRM and that your user can access the DRM devices (/dev/dri/?).

- Mark