[mythtv-users] Video encoding and ffmpeg

John Baab john.baab at gmail.com
Tue Oct 12 15:25:46 UTC 2010

On Tue, Oct 12, 2010 at 10:08 AM, Justin Bracken <scourched at gmail.com> wrote:
> Hello all,
> Recently started messing with mythexport. Was kind of cool learning
> how to compile and all with me being a noob. I have been spending the
> weekend transcoding video to play on an iPhone 3GS. I'm running into
> some problems. One is that it seems I cannot encode with h264 and mp3
> into a mp4 file or I believe an m4v file. It appears to be isolated to
> the audio selection. If I change to libfaac everything runs. I have
> been able to transcode wav to mp3. So i think I built ffmpeg right. I
> started this venture by stealing the command line from the
> mythexport.log and then reverse engineered the line to understand what
> it was doing. The rub now is that for some reason libfaac is not
> properly setting the bitrate and it seems like any player I choose
> assumes it's 128k instead of the correct value of 192k. This appears
> to cause a audio sync problem. Which took me a while to realize it
> could not be fixed with itsoffset.
> I'm curious if anyone can help? Either with their iPhone settings or
> with the audio sync or with the file format and encoding problems.
> Does it appear I'm doing something blatantly wrong?
> Thanks
> Scourched
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Try adding an -ac 2 line to your ffmpeg line

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