[vlc-devel] RTSPServer to VLC

David Cassany Viladomat david.cassany at i2cat.net
Tue Jul 22 17:25:25 CEST 2014


Hi all,

I'm trying to playback audio from an RTSP server (using live555) that
already works with ffplay and mplayer.

The transmitted format is PCMU/48000/2 with payload type 96.

The output message from the vlc is as shown:
[0x901468] pulse audio output debug: cannot synchronize start
[0x901468] pulse audio output debug: deferring start (9915 us)
[0x901468] pulse audio output warning: starting late (-251 us)
[0x901468] main audio output warning: buffer too late (-16120153 us):
dropped
[0x901468] main audio output warning: buffer too late (-16110267 us):
dropped
[0x901468] pulse audio output debug: changing sink 1:
alsa_output.pci-0000_00_1b.0.analog-stereo (Built-in Audio Analog Stereo)

Then, it get lost here:
[0x901468] main audio output warning: buffer too late (-3392242 us): dropped
[0x901468] main audio output debug: inserting 46535 zeroes
[0x901468] main audio output warning: playback way too early (-120008):
playing silence
[0x901468] main audio output debug: inserting 5760 zeroes
[0x901468] main audio output warning: playback too early (-50004):
down-sampling
[0x901468] main audio output warning: timing screwed (drift: -110003 us):
stopping resampling

And, finally, VLC seems to properly get the increment (to be in sync.
thanks to the RTCP packets) of timing in the GUI but without playing
anything. I have checked the RTP timestamps of the RTP packets too and
everythink looks fine, the increment is equal to the samples number in the
packet.

Is it a known issue? Does anyone has an idea of which is the problem?

Thank you in advance,

Kind regards,
David
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