[MPlayer-users] use mplayer with slow rtmp stream

[Reimar Döffinger]

On Sun, Mar 06, 2016 at 09:04:18PM +0100, john smith wrote:
> On 3/6/16, Reimar Döffinger <Reimar.Doeffinger at gmx.de> wrote:
> > On Sun, Mar 06, 2016 at 07:44:46PM +0100, john smith wrote:
> >> I use rtmpdump to get a livestream I want to put as a screensaver
> >> inside mplayer inside xscreensaver.  The command I use is:
> >>
> >> rtmpdump -live -r 'rtmp://cdn-03.whatsupcams.com/live/es_laspalmas3' \
> >>          -W http://www.whatsupcams.com/static/flowplayer/flowplayer.swf \
> >>          -quiet | mplayer -cache 8192 -
> >>
> >> The problem is that playback does not start at all but only in a
> >> couple of minutes, instead I get a lot of this:
> >>
> >> Cache empty, consider increasing -cache and/or -cache-min. [performance
> >> issue]
> >
> > There are a few things that go wrong.
> > On in particular is that FFmpeg has issues with the audio stream,
> > it thinks there is one but it can't figure out the format.
> > All issues can be worked around with:
> > -lavfdopts probesize=32 -demuxer lavf
> 
> I tried this:
> 
> rtmpdump -v -r 'rtmp://cdn-03.whatsupcams.com/live/es_laspalmas3' \
>          -W http://www.whatsupcams.com/static/flowplayer/flowplayer.swf  | \
>           mplayer -lavfdopts probesize=64 -demuxer lavf -
> 
> but somewhere in the middle of output mplayer says:
> 
> 34.155 kB / 10200.47 sec[live_flv @ 0x7f73ba6c2220]Stream #0: not
> enough frames to estimate rate; consider increasing probesize
> [live_flv @ 0x7f73ba6c2220]decoding for stream 0 failed
> [live_flv @ 0x7f73ba6c2220]Could not find codec parameters for stream
> 1 (Audio: none, 0 channels): unknown codec
> Consider increasing the value for the 'analyzeduration' and 'probesize' options
> 
> I tried increasing probesize to 128 but to no avail. Playback is still
> not started but on the bottom I can see this:

You can increase probesize to infinity and it won't change anything.
The audio cannot be played (is there audio? I actually assumed
there is none).
The point of setting the low probesize is exactly to make
it not even try and instead start playing.