[FFmpeg-user] mosaic with audio from live streams

[Madovsky]

Hi,

I tried to make a mosaic with all video audio from the example below

https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

with live rtmp as input sources.
everything works well, unless the half of runs failed. I got a loop
of ffmpeg missing picture in access  no frames! and had to rerun until
it works.

once it runs, for tests I use the same live stream for the 2 or 4 mosaic 
units and
noticed that there is around 3 seconds difference between every mosaic 
screen.
which means that from the 1 screen treated to the 4 there is around 9 
seconds delay.


How to get the 2, 4 or more mosaic screens synced from each other with 
the same

sync that the rtmp server?

Many thanks

Franck
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Re: [FFmpeg-user] using -vtag on input files

[Roee Kashi]

just mentioning, adding  | OUT_INPUT to vtag option indeed sort it out.
i hope it will get into git-master one day :)

thanks

2015-04-02 19:32 GMT+03:00 tim nicholson nichot20-at-yahoo@ffmpeg.org:

 On 02/04/15 16:45, Carl Eugen Hoyos wrote:
  tim nicholson nichot20-at-yahoo.com at ffmpeg.org writes:
 
  ffmpeg.exe -f rawvideo -vcodec rawvideo -s 704x576
  -r 25 -pix_fmt yuv420p -vtag YV12 -i raw.yuv -f avi
  -qscale 0 out.avi
 
  Ahh, so you are using the pix_fmt to specify the input...
 
  What happened on the older version if you left the
  -vtag off? I think its always only been an output
  only option
 
  It was definitely an input- and output-option.
  It is currently not possible to (easily) read
  such streams.
 

 So it was, I see you fixed it ages ago, sorry for causing confusion by
 misremebering.

 In oreder to make amends I think I have tracked the issue down

 It looks like the merge 5743095c line 3043 from avconv made it at output
 only option...

 needs an  OPT_INPUT | OPT_OUTPUT instead of OPT_OUTPUT


  One possible work-around is of course to remux
  to nut with (output) option vtag.
 
  Carl Eugen
 
  [...]


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 Tim.
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