Hi Ezequiel, On the Librem 5 (imx8mq) I try to decode a (h264) full hd video file using the VPU. I'm running the following tree that doesn't change much, but adds the VPU dts description: https://source.puri.sm/martin.kepplinger/linux-next/-/commits/5.8-rc3/librem5___vpu (output of "v4l-ctl --all" at the bottom). I now run your version of ffmpeg: https://gitlab.collabora.com/ezequiel/ffmpeg/-/commits/stateless-mpeg2-vp8-h264-v4 (with minor build fixes) but simply doing "ffplay <file>" seems like not using /dev/video0 Is this supposed to work? If so, do I need to know anything about ffmpeg to be able to test this? How do you verify that the v4l2 mem2mem device (vpu) is being used? thanks a lot, martin purism@pureos:~/ffmpeg_sources/ffmpeg$ v4l2-ctl --all Driver Info: Driver name : hantro-vpu Card type : nxp,imx8mq-vpu-dec Bus info : platform: hantro-vpu Driver version : 5.8.0 Capabilities : 0x84204000 Video Memory-to-Memory Multiplanar Streaming Extended Pix Format Device Capabilities Device Caps : 0x04204000 Video Memory-to-Memory Multiplanar Streaming Extended Pix Format Media Driver Info: Driver name : hantro-vpu Model : hantro-vpu Serial : Bus info : platform: hantro-vpu Media version : 5.8.0 Hardware revision: 0x00000000 (0) Driver version : 5.8.0 Interface Info: ID : 0x0300000c Type : V4L Video Entity Info: ID : 0x00000001 (1) Name : nxp,imx8mq-vpu-dec-source Function : V4L2 I/O Pad 0x01000002 : 0: Source Link 0x02000008: to remote pad 0x1000004 of entity 'nxp,imx8mq-vpu-dec-proc': Data, Enabled, Immutable Priority: 2 Format Video Capture Multiplanar: Width/Height : 48/48 Pixel Format : 'NV12' (Y/CbCr 4:2:0) Field : None Number of planes : 1 Flags : Colorspace : JPEG Transfer Function : Default YCbCr/HSV Encoding: Default Quantization : Default Plane 0 : Bytes per Line : 48 Size Image : 3456 Format Video Output Multiplanar: Width/Height : 48/48 Pixel Format : 'MG2S' (MPEG-2 Parsed Slice Data) Field : None Number of planes : 1 Flags : Colorspace : JPEG Transfer Function : Default YCbCr/HSV Encoding: Default Quantization : Default Plane 0 : Bytes per Line : 0 Size Image : 4608 Codec Controls mpeg_2_slice_parameters 0x009909fa (unknown): type=103 flags=has-payload mpeg_2_quantization_matrices 0x009909fb (unknown): type=104 flags=has-payload h264_profile 0x00990a6b (menu) : min=0 max=4 default=2 value=2 h264_sequence_parameter_set 0x00990ce8 (unknown): type=110 flags=has-payload h264_picture_parameter_set 0x00990ce9 (unknown): type=111 flags=has-payload h264_scaling_matrix 0x00990cea (unknown): type=112 flags=has-payload h264_slice_parameters 0x00990ceb (unknown): type=113 flags=has-payload h264_decode_parameters 0x00990cec (unknown): type=114 flags=has-payload h264_decode_mode 0x00990ced (menu) : min=1 max=1 default=1 value=1 h264_start_code 0x00990cee (menu) : min=1 max=1 default=1 value=1 vp8_frame_header 0x009910d0 (unknown): type=301 flags=has-payload
