[FFmpeg-trac] #1174(undetermined:new): iPod / iPad plays both audio tracks simultaneously

FFmpeg trac at avcodec.org
Sat Apr 7 15:31:11 CEST 2012

#1174: iPod / iPad plays both audio tracks simultaneously
             Reporter:  TonyPh12345  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  0.10.2       |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by TonyPh12345):

 Replying to [comment:4 cehoyos]:
 > You can use -vcodec mpeg4 instead of -vcodec copy to test if the audio
 issue is still reproducible with current git head.
 > Did you test the patch in ticket #468? You may need to git checkout
 62101030c4ff23c61046a70cd27a627dfb0e0e54 to be able to apply the patch.

 Using the -vcodec mpeg4 did indeed allow the GIT clone to run.  However,
 no fix for the audio as-is.

 Since I'm a complete git-iot, I just hand-edited the patch from 468 into
 the two files in the git clone and recompiled... It worked.  iPad and iPod
 both played the file correctly.

 Unfortunately, the differences between the GIT and the 0.10.2 are too
 extreme for me to the just re-use the edited movenc.c and movenc.h in the
 10.2 build... won't compile. :(

 Is there any branch that would get me far enough to keep using the -vcodec
 COPY option, while keeping the patch?  (-copy runs about 8x faster than
 re-encoding to MP4... and I have about 3000 files I want to run this

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1174#comment:5>
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