[FFmpeg-trac] #450(documentation:new): Specify the position of -isync more precisely

[FFmpeg]

#450: Specify the position of -isync more precisely
-------------------------------------+-------------------------------------
               Reporter:  burek      |                  Owner:  stefano
                   Type:             |                 Status:  new
  enhancement                        |              Component:
               Priority:  normal     |  documentation
                Version:             |               Keywords:
  unspecified                        |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 I've figured that the -isync option does not produce the same effect when
 placed in front of inputs, between the inputs and after the inputs. I just
 think it would be a good idea to put a little explanation in the
 documentation about the proper usage of that option.

 For example, these 2 examples produce different results:

 ffmpeg -f alsa -ac 1 -i hw:1 -isync -f video4linux2 -r 15 -s qqvga -i
 /dev/video0 -vcodec libx264 -preset ultrafast -g 15 -crf 20 -acodec aac
 -strict experimental -ar 44100 -ab 96k -ac 1 -f mpegts
 udp://192.168.25.101:10001

 ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -r 15 -s qqvga -i /dev/video0
 -isync -vcodec libx264 -preset ultrafast -g 15 -crf 20 -acodec aac -strict
 experimental -ar 44100 -ab 96k -ac 1 -f mpegts udp://192.168.25.101:10001

 (the second example has -isync moved after the 2nd input)

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/450>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker