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First post here, hopefully i'm in the right place :)

I'm attempting to stream low-latency video from my Raspberry Pi to my Windows PC using Raspivid and VLC. I'm no expert on this stuff and i'm mainly following tutorials and trying to understand what I can. I'm streaming over RTSP.

Here is my code for starting the stream on the Pi. I've used some variations of this that i've found online, but it generally remains the same:

raspivid -o - -t 0 -n -w 600 -h 400 -fps 15 -rot 180 | cvlc -vvv stream:///dev/stdin --sout '#rtp{sdp=rtsp://:8554/}' :demux=h264

I connect on Windows in VLC using the address:

rtsp://192.168.1.2:8554/

I can start the stream on the Pi and it runs through code, only throwing the following three errors on different lines. In VLC, I can open the stream without issue.

main stream error: unknown query 0x30e in demux_vaControlHelper
main interface error: no suitable interface module
main libvlc error: interface "globalhotkeys,none" initialization failed

Once I get to the stream in VLC though, it freezes and the Pi's terminal gives the following errors:

 main input error: ES_OUT_SET_(GROUP_)PCR  is called too late (pts_delay increased to 1261 ms)

...then buffers to 100% before:

main input error: ES_OUT_SET_(GROUP_)PCR is called too late (pts_delay increased to 2939 ms)

...and this buffering and then error loop repeats continuously until right before I terminate the program where it gives this error:

main input error: ES_OUT_SET_(GROUP_)PCR  is called too late (jitter of 6511 ms ignored)
main decoder error: Timestamp conversion failed for 15860001: no reference clock
main decoder error: Could not convert timestamps 0, 0 for h264

Every time the stream buffers, the stream unfreezes and I get some movement in VLC, but nothing usable.

I've tried adding the following flags to my starting command without luck:

  • :network-caching=3000
  • :clock-jitter=0
  • --network-caching
  • --file-caching

Nothing i've found has worked to solve this so far. If anyone has a solution, I would be grateful to hear it. Thanks!

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3 Answers 3

Reset to default
3

Some tests on my pi showed that this message vanishes when you set -fps to 50 or above.

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2
  • This does seem to fix my immediate issue, which is awesome. However, my stream still has a 2-3 second delay that I can't seem to remedy. Any thoughts on what could cause that?
    – Benjamin Hogervorst
    Apr 6, 2019 at 21:08
  • @BenjaminHogervorst did you ever get this to work without the 2-3s delay?
    – CoderChris
    Dec 15, 2019 at 20:00
10

Use the --h264-fps option to suggest input stream fps to VLC.

raspivid -o - -t 0 -n -w 600 -h 400 -fps 15 -rot 180 | cvlc -vvv stream:///dev/stdin --sout '#rtp{sdp=rtsp://:8554/}' :demux=h264 --h264-fps=15

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0

This should be the accepted answer.
Use the same value for raspivid -fps and cvlc --h263-fps= to avoid vlc reading more/less frames than raspivid delivers.

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