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hlsMuxer crashes when using h264_v4l2m2m encoder on Raspberry PI 4 #1155

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georgy-komarov opened this issue Sep 15, 2022 · 3 comments
Closed
1 of 13 tasks

hlsMuxer crashes when using h264_v4l2m2m encoder on Raspberry PI 4 #1155

georgy-komarov opened this issue Sep 15, 2022 · 3 comments
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bug Something isn't working

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@georgy-komarov
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Which version are you using?

v0.20.0

Which operating system are you using?

  • Linux amd64 standard
  • Linux amd64 Docker
  • Linux arm64 standard
  • Linux arm64 Docker
  • Linux arm7 standard
  • Linux arm7 Docker
  • Linux arm6 standard
  • Linux arm6 Docker
  • Windows amd64 standard
  • Windows amd64 Docker (WSL backend)
  • macOS amd64 standard
  • macOS amd64 Docker
  • Other (please describe)

Describe the issue

I'm trying to stream USB Webcam video as LL-HLS and using hardware h264 encoding on Raspberry Pi 4 (Raspbian arm64) with h264_v4l2m2m. However rtsp-simple-server crashes in 1-2 seconds after ffmpeg start.

However I'm not sure if it is ffmpeg issue or rtsp-simple-server issue because everything looks fine if I run the following commands

ffmpeg -f v4l2 -video_size 640x480 -framerate 24 -i /dev/video0 -c:v h264_v4l2m2m -an crash.mp4
ffmpeg -re -stream_loop -1 -i crash.mp4 -c copy -f rtsp rtsp://localhost:8554/cam

Describe how to replicate the issue

  1. Start the server
  2. Publish with ffmpeg -f v4l2 -video_size 640x480 -framerate 24 -i /dev/video0 -c:v h264_v4l2m2m -an -f rtsp rtsp://localhost:8554/cam

Did you attach the server logs?

yes
crash.log

Did you attach a network dump?

no
@aler9 aler9 mentioned this issue Dec 9, 2022
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@aler9 aler9 added the bug Something isn't working label Dec 9, 2022
@aler9
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aler9 commented Jan 4, 2023

Hello, this issue is caused by two bugs:

  1. a FFmpeg-side bug: when using h264_v4l2m2m, the SPS and PPS are not sent to the server. This has been fixed in FFmpeg 5 as reported by @roger- . FFmpeg 5 can be downloaded here

  2. a server-side bug: when SPS and PPS are not present, two empty NALUs are prepended to any IDR NALU, resulting in the crash

@aler9 aler9 mentioned this issue Jan 4, 2023
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aler9 added a commit that referenced this issue Jan 5, 2023
@aler9
fix crash when H264 or H265 parameters are nil (#1155)
59c0ef5 
in H264 and H264, parameters (VPS, SPS and PPS) are automatically
prepended to random access units. When parameters were nil, they were
prepended anyway, leading to a crash. Parameters are not prepended only
if they are valid.
@aler9
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aler9 commented Jan 8, 2023

Fixed in v0.21.1

@aler9 aler9 closed this as completed Jan 8, 2023
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This issue is being locked automatically because it has been closed for more than 6 months.
Please open a new issue in case you encounter a similar problem.

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@georgy-komarov @aler9