Issue with h264_v4l2m2m on Raspberry Pi 4 using FFmpeg

[damavand1]

Hi,

I'm using a Raspberry Pi 4, and I encountered an issue while trying to offload video encoding to the GPU using the h264_v4l2m2m codec in FFmpeg.

When I stream video using the h264 codec, around 40% of my CPU is utilized by FFmpeg. To optimize performance, I switched to h264_v4l2m2m.

Here's the command I use to run my RTMP server in Docker:

CANDIDATE="my internet server IP"
sudo docker run --restart=always -it -p 1935:1935 -p 1985:1985 -p 100:8080 -p 1990:1990 -p 8088:8088 -p 10080:10080/udp \
    --env CANDIDATE=$CANDIDATE -p 8000:8000/udp \
    docker.manageit.ir/ossrs/srs:5

And this is the FFmpeg command I use on my Raspberry Pi 4, where the camera is connected:

sudo ffmpeg -re \
    -i /dev/video0 \
    -framerate 25 \
    -f v4l2 \
    -fflags nobuffer \
    -c:v h264_v4l2m2m \
    -pix_fmt yuv420p \
    -preset ultrafast \
    -tune zerolatency \
    -flush_packets 1 \
    -rtmp_buffer 0 \
    -rtmp_live live \
    -f flv \
    rtmp://my internet server IP/live/livestream1

However, I get the following error:

Codec AVOption preset (Configuration preset) specified for output file #0 (rtmp://my internet server IP/live/livestream1) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Codec AVOption tune (The metric that the encoder tunes for. Automatically chosen by the encoder by default) specified for output file #0 (rtmp://my internet server IP/live/livestream1) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.

av_interleaved_write_frame(): Broken pipe time=00:00:00.00 bitrate=N/A speed=   0x
[flv @ 0xaaaae235a140] Failed to update header with correct duration.
[flv @ 0xaaaae235a140] Failed to update header with correct filesize.
Error writing trailer of rtmp://my internet server IP/live/livestream1: Broken pipe

How can I solve this problem?

Thanks in advance!