[FFmpeg-trac] #1349(ffmpeg:reopened): itsoffset doesn't work for second input file (audio)

[FFmpeg]

#1349: itsoffset doesn't work for second input file (audio)
------------------------------------+------------------------------------
             Reporter:  bombo       |                    Owner:
                 Type:  defect      |                   Status:  reopened
             Priority:  normal      |                Component:  ffmpeg
              Version:  git-master  |               Resolution:
             Keywords:  itsoffset   |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by Selur):

 Since I ran into this problem again.

 For testing the effect of itsoffset I took a synch avi(xvid,mp3) file and
 remuxed it using:

 1.
 {{{
 ffmpeg -y -itsoffset 00:00:10.000 -i "test.avi" -i "test.mp3" -vcodec copy
 -acodec copy -map 0:0 -map 1:0 -vtag XVID -aspect 181818:100000 -r 25 -f
 avi "test1.avi"
 }}}
 -> Audio starts 10sec before video (this is like I expected)

 2.
 {{{
 ffmpeg -y -i "test.avi"  -itsoffset -00:00:10.000 -i "test.mp3" -vcodec
 copy -acodec copy -map 0:0 -map 1:0 -vtag XVID -aspect 181818:100000 -r 25
 -f avi "test3.avi"
 }}}
 -> Audio starts 10sec before video (this is like I expected)

 3.
 {{{
 ffmpeg -y -itsoffset -00:00:10.000 -i "test.avi" -i "test.mp3" -vcodec
 copy -acodec copy -map 0:0 -map 1:0 -vtag XVID -aspect 181818:100000 -r 25
 -f avi "test2.avi"
 }}}
 -> Audio and video start at the same time (I expected that the video would
 start before the audio)
 4.
 {{{
 ffmpeg -y -i "test.avi"  -itsoffset 00:00:10.000 -i "test.mp3" -vcodec
 copy -acodec copy -map 0:0 -map 1:0 -vtag XVID -aspect 181818:100000 -r 25
 -f avi "test4.avi"
 }}}
 -> Audio and video start at the same time (I expected that the video would
 start before the audio)


 => '''How to handle negative audio delays with ffmpeg and an avi
 container?'''


 Also all of these calls give me:
 {{{
 [avi @ 000001f1b4b8e280] Timestamps are unset in a packet for stream 0.
 This is deprecated and will stop working in the future. Fix your code to
 set the timestamps properly[/quote]
 }}}

 => '''How to do it properly to avoid this warning and be save for the
 future?'''

 Thanks!

--
Ticket URL: <https://trac.ffmpeg.org/ticket/1349#comment:10>
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