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charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Detlev, Thanks a lot for your work! I try to use rkvdec2 with chromium but it can't play h264 video. Here is the log of chromium: [5799:5873:0617/171224.850061:VERBOSE2:video_decoder_pipeline.cc(473)] Initialize(): config: codec: h264, profile: h264 high, level: not available, alpha_mode: is_opaque, coded size: [1920,1080], visible rect: [0,0,1920,1080], natural size: [1920,1080], has extra data: true, encryption scheme: Unencrypted, rotation: 0°, flipped: 0, color space: {primaries:BT709, transfer:BT709, matrix:BT709, range:LIMITED} [5799:5886:0617/171224.850915:VERBOSE2:v4l2_video_decoder.cc(182)] V4L2VideoDecoder(): [5799:5886:0617/171224.851218:VERBOSE1:v4l2_device.cc(128)] Open(): No devices supporting H264 for type: 0 [5799:5886:0617/171224.851346:VERBOSE4:v4l2_queue.cc(1069)] This queue does support requests.: No such file or directory (2) [5799:5886:0617/171224.851426:VERBOSE1:v4l2_video_decoder.cc(476)] InitializeBackend(): Using a stateless API for profile: h264 high and fourcc: S264 [5799:5886:0617/171224.851687:VERBOSE1:v4l2_video_decoder.cc(598)] SetupInputFormat(): Input (OUTPUT queue) Fourcc: S264 [5799:5886:0617/171224.851797:VERBOSE1:v4l2_video_decoder.cc(636)] AllocateInputBuffers(): Requesting: 17 OUTPUT buffers of type V4L2_MEMORY_MMAP [5799:5886:0617/171224.867687:VERBOSE1:v4l2_queue.cc(1511)] Streamon(): (OUTPUT_MPLANE) VIDIOC_STREAMON failed: Invalid argument (22) [5799:5886:0617/171224.867902:VERBOSE1:v4l2_video_decoder.cc(937)] StartStreamV4L2Queue(): Failed to streamon V4L2 queue. [5799:5886:0617/171224.868009:VERBOSE1:v4l2_video_decoder.cc(1377)] SetState(): Error occurred, stopping queues. [5799:5886:0617/171224.868105:ERROR:v4l2_video_decoder.cc(120)] StartStreamV4L2Queue failed at Decode@media/gpu/v4l2/v4l2_video_decoder.cc:915 [5799:5886:0617/171224.871898:WARNING:v4l2_video_decoder_backend_stateless.cc(126)] There is/are 0 pending CAPTURE queue buffers pending dequeuing. This might be fine or a problem depending on the destruction semantics (of theclient code. Here is the chromium code failed when calling VIDIOC_STREAMON: https://github.com/chromium/chromium/blob/125.0.6422.60/media/gpu/v4l2/v4l2_queue.cc#L1508 I'm running chromium v125.0.6422.60 and I can decode 1080p h264 with hantro g1 decoder on rk3588. Best regards, Jianfeng