Muxing halts when no audio stream

[Peter Biro]

Hi all,

I have the following pipeline:

udpsrc multicast-group=<DCL_FILEWRITER_UDP_SOURCE_IP> auto-multicast=true port=<DCL_FILEWRITER_UDP_SOURCE_PORT>
        ! application/x-rtp,media=video,encoding-name=VP8,payload=96 ! rtpjitterbuffer ! rtpvp8depay ! tee name=video_stream_spilt
        udpsrc port=<DCL_FILEWRITER_UDP_AUDIO_SOURCE_PORT>
        ! application/x-rtp,media=audio,clock-rate=44100,encoding-name=L24,encoding-params=1,channels=1,payload=96,ssrc=687131883,timestamp-offset=3784732336,seqnum-offset=8272
        ! rtpL24depay ! audioconvert ! audioresample ! queue name=file_sink_audio_queue ! voaacenc ! video_mux.
        video_stream_spilt. ! queue name=file_sink_video_queue ! omxvp8dec ! videoconvert ! omxh264enc bitrate=<DCL_RECORD_VIDEO_BITRATE> control-rate=2 insert-sps-pps=true ! matroskamux name=video_mux
        ! filesink name=file_sink location=<DCL_FILEWRITER_INITIAL_TEMP_FILE_NAME>
        video_stream_spilt. ! fakesink

My problem with this is that if the audio stream stops (during operation due to some error) the file writing stops I assume the muxer is waiting for the audio stream which is not arriving (if I recover the audio stream it will continue to write the file). 

I want to improve the reliability by making the file writing continuous regardless if I have the audio or not (by making the audio is optional). I already tried to add an audio mixer which would mix a muted audio stream (audiotestsrc wave=silence) but that adds extra resource usage and I feel that its more like a workaround since the root cause is that the muxer is waiting for the audio stream.

Do you know any setting or any way how could I get this behaviour?

Thank you!

Bests,
Peter

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