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Old 15th December 2009, 21:27   #1  |  Link
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Join Date: Jun 2009
Location: Moscow
Posts: 9
Playback of low frame rate stream

We have met with some difficulties while playing back an mms stream. Brief description:
The stream was either:

(mencoder)h264 1920x1080 @ 1fps
(mencoder)mjpeg 1920x1080 @ 1fps
(mencoder)h264 1920x1080 @ 0.1fps
(mencoder)mjpeg 1920x1080 @ 0.1fps

Here a sample of mencoder script:

mencoder -vf pp=l5 -frames 20 -ovc lavc -lavcopts vcodec=mjpeg:mbd=1:vbitrate=100 -ofps 0.1 -oac faac -faacopts br=32:mpeg=4 mmsh://some_ip:8080 -o 01fpsvideo.ts
then this video is live streamed with vlc:

vlc 01fpsvideo.ts --loop :sout=#duplicate{dst=std{access=mmsh,mux=asfh,dst=:8080}}
And an observation as follows:

when streaming an 1fps stream mplayer or vlc playback the stream normally:

mplayer mmsh://some_ip:8080
vlc mmsh://some_ip:8080
and when streaming an 0.1fps stream both mplayer and vlc fails to playback it:

mplayer says "no video" with partial bufferization while playing back audio
and vlc says nothing, plays audio, but no video as well.

The threshold we've found is exactly 1 fps.

Could anyone advise some encode/playback options to achive lower framerates?
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