Playing a live RTMP (flv, h264) stream

[Nicolas Dufresne]

Le vendredi 21 juin 2019 à 18:35 +0300, Chen Fisher a écrit :
> Hello all,
> 
> I'm trying to play a live RTMP stream (from an nginx-rtmp source) and fail on flvdemux.
> flvdemux is saying no video found after 6 seconds of audio, although it recognizes there's a video stream and there are video packets coming in even after it has decided there's no video.
> 
> 0:00:08.776685700 42065 0x5633904b0ed0 ERROR               flvdemux gstflvdemux.c:1558:gst_flv_demux_parse_tag_video:<d> got H.264 video packet before codec data
> 
> 0:00:08.778178000 42065 0x5633904b0ed0 DEBUG               flvdemux gstflvdemux.c:1295:gst_flv_demux_parse_tag_audio:<d> Signalling no-more-pads because no video stream was found after 6 seconds of audio
> 
> 0:00:08.778626100 42065 0x5633904b0ed0 LOG                 flvdemux gstflvdemux.c:1469:gst_flv_demux_parse_tag_video:<d> parsing a video tag
> 0:00:08.778649200 42065 0x5633904b0ed0 WARN                flvdemux gstflvdemux.c:1477:gst_flv_demux_parse_tag_video:<d> Signaled no-more-pads already but had no video pad -- ignoring
> 
> I believe flvdemux is waiting for a keyframe (hence the first error) and it receives it after it has decided to abandon the video pad (6 seconds of audio data). Although keyframes are sent every 1 second in the source stream....

This normally means there was audio for 6 second without any video
packet. In this case, flvdemux assume that the presence of the video
was a lie. There is not support for renegotiation. Best is to record a
small portion of the RTMP stream so we can analyze it offline.

> 
> My gst pipeline:
> gst-launch-1.0 rtmpsrc location=rtmp://<source of rtmp stream> ! flvdemux ! flvmux ! filesink location=f1
> 
> I also tried several options with queues, but the flvdemux fails to delay link the video pad for the above reasons.
> 
> Any help would be appreciated!
> Thanks!
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> gstreamer-devel at lists.freedesktop.org
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