long pauses during rtsp playback

[Marco Ballesio]

Hi,

On Wed, Oct 20, 2010 at 1:49 AM, Doug Crawford <[hidden email]> wrote:

I purchased an Axis M1011 network camera with h.264 support, but I still have
the same bursty video: 2-3 seconds of faster than realtime video followed by
a 3-4 second pause.

this, I assume, still happens only when the sink element you use is not synchronising output buffers (sync=false).
 

Here is the output of "gst-launch --gst-debug-level=2 -v rtspsrc
location=rtsp://10.5.5.34/axis-media/media.amp ! rtph264depay ! TIViddec2
codecName=h264dec engineName=codecServer ! fakesink"
http://pastebin.com/xzbMutQH

I don't see anything wrong with buffer sizes, durations and timestamps. That is, I see no timing issues in the buffers arriving to the sink.
 

I tried adding an identity element "gst-launch --gst-debug-level=2 rtspsrc
location=rtsp://10.5.5.34/axis-media/media.amp ! rtph264depay ! queue !
TIViddec2 codecName=h264dec engineName=codecServer ! identity
check-perfect=true ! TIDmaiVideoSink videoStd=VGA videoOutput=LCD
sync=false".  But identity was completely silent.

well, as timing appears to be fine, identity shouldn't really have anything to complain about.
 

Here is an interesting post in the TI forums explaining why there is a big
pause before seeing the first frame when using TIVideDec2
https://gstreamer.ti.com/gf/project/gstreamer_ti/forum/?_forum_action=ForumMessageBrowse&thread_id=3676&action=ForumBrowse&forum_id=187

So I understand the decoder is buffering a fixed 1.5 MB of data, disregarding the bitrate and actual frame size.. let me say it appears to me more a bug than a feature. This may be a reasonable cause for the sink dropping buffer in case the decoder element is not propagating a right latency info. Just out of curiosity, wouldn't gst-dsp be compatible with your receiver side architecture?

Another idea: as BaseSink has a max-lateness property, probably TIDmaiVideoSink has it as well, so you may try to set it to a reasonably high value to get a smooth (but 2 sec in late) video. A simple:

gst-inspect TIDmaiVideoSink

will tell you whether the property is supported or not.

Regards






 

Doug
--
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