badsenior.blogg.se - Ffmpeg h265 decoder

The CUVID decoder results in a green screen for many movies. That I don’t understand.I posted another topic similar to this ( ) but that workaround no longer works well. Strangely after that the framerate dropped dramatically to about 60fps. Like this: NvBuffer2Raw(decoded_buffer->planes.fd, 0, parm.width, parm.height. But I’ve tried to change the code in nvv4l2_dec.c so it extracts data from a source buffers instead of a destination buffer. Naturally a mere disablement of NvBufferTransform completely discards output of decoder, therefore is useless by itself. If removed, the framerate increases to similar as with a gstreamer. Right now I think the main culprit is NvBufferTransform. maximizing jetson nano performance with ‘nvpmodel’ and ‘jetson_clocks’ increases performance for all implementations but ffmpeg’s h264_nvv4l2dec still remains 2 times slower than gstreamer’s nvv4l2decoder.performance slightly less than the h264_nvv4l2dec but near.it uses NvVideoDecoder class from Video Decoder API.there is GitHub - jocover/jetson-ffmpeg: ffmpeg support on jetson nano implementation of a codec with the jetson multimedia API.disabling options enable-max-performance in a gstreamer also doesn’t change it’s performance.

ret = set_ext_controls(ctx->fd, V4L2_CID_MPEG_VIDEO_MAX_PERFORMANCE, 1).enabling V4L2_CID_MPEG_VIDEO_MAX_PERFORMANCE does nothing.after that the ffmpeg’s decoding framerate jumps to 160+fps.changing an output pixel format from YUV420 to NV12 increases a ffmpeg’s h264_nvv4l2dec performance a lot, but still far from a gstreamer:.

this means there are many hardware resources remains available when only one ffmpeg process is running.

two ffmpeg decoding processes may be started simultaneously and fps won’t drop: each will still be decoding 120fps.

4 cortex-a57 cores able to achieve almost the same decoding speed as NVDEC DSP with an ffmpeg implementation.

ffmpeg -c:v h264 -threads 4 -i jellyfish-5-mbps-hd-h264.mkv -c:v rawvideo -f null.

ffmpeg -c:v h264_nvv4l2dec -i jellyfish-5-mbps-hd-h264.mkv -c:v rawvideo -f null.gst-launch-1.0 filesrc location= jellyfish-5-mbps-hd-h264.mkv ! matroskademux ! h264parse ! nvv4l2decoder enable-max-performance=1 ! fpsdisplaysink text-overlay=0 video-sink=fakesink sync=0 -v.What magic tricks or settings allow gstreamer’s nvv4l2decoder outperform ffmpeg’s h264_nvv4l2dec more than 2x in h264 1080p decoding?