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?

Ffmpeg nvidia h264