[mythtv-commits] Ticket #4535: mytharchive encodes multiple audio streams to mpeg2 incorrectly

[MythTV]

#4535: mytharchive encodes multiple audio streams to mpeg2 incorrectly
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 Reporter:  thrantastic at gmail.com  |       Owner:  paulh  
     Type:  patch                  |      Status:  new    
 Priority:  minor                  |   Milestone:  unknown
Component:  mytharchive            |     Version:  head   
 Severity:  low                    |     Mlocked:  0      
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 I recently exported a recording with 2 audio streams and they ended up
 getting switched around (as it seems mythtranscode is wont to do from time
 to time). Upon further investigation, however, it seemed that mytharchive
 was selecting the correct streams in the right order when encoding, but
 they were still coming out wrong when the file was demuxed and then
 remuxed.

 Finally I discovered that ffmpeg was not mapping the streams as requested
 by mythburn.py because it was being called with slightly incorrect
 arguments. Multiple audio streams being added with ffmpeg requires
 multiple -acodec, -ab, etc. switches, one for each stream. Mythburn.py was
 not doing this, so ffmpeg did not re-order the streams as requested, and
 in fact was transcoding the wrong one to ac3 which is why it got chosen
 during the demuxing/remuxing process.

 I have attached a patch that correctly adds the audio switches for a
 second audio stream. It duplicates the parameters being used for the first
 stream, so no changes are needed to the encoding profiles. This patch was
 successful in exporting the troublesome file I mentioned earlier and
 doesn't seem to have broken anything, but it has not received much testing
 beyond that.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/4535>
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