FFmpeg and h264_v4l2m2m on Raspberry Pi 4 for Streaming

[damavand1]

Hi,

I'm using a Raspberry Pi 4, and when I stream video with FFmpeg using the h264 codec, about 40% of my CPU is being utilized. Now, I want to offload the encoding to the GPU by using the h264_v4l2m2m codec.

I am utilizing the following command to execute the SRS (Simple Real-Time Streaming) server using 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

This is the FFmpeg command I am using to stream from the camera attached to my Raspberry Pi 4:

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 encounter the following error on my Raspberry Pi 4:

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 resolve this issue?

Thanks

TRANS_BY_GPT4