[mythtv] Mytharchive - bad subsid-track mp2 to ac3 conversion

John Pilkington J.Pilk at tesco.net
Fri Feb 8 14:39:02 UTC 2008


I just installed the latest ATrpms build: 0.21-175_trunk_r15741.el5.i386

As suggested by the wiki I have Mytharchive converting the two native 
mp2 audio channels to ac3.  The subsidiary track is garbled in the dvd 
image - Donald Duck effect.   Same in mplayer and internal .iso player.

With the earlier 15447 build I had noticed that the two audio streams 
before the remux were both the same size.  I now find that the 
subsidiary track is garbled on a DVD burned with that build.

I don't think I really need to do the mp2 to ac3 thing - it's just a 
workaround to help players that can't handle both, and the title music 
is supplied as ac3.

For the original recording as input after mythtranscode:

$ ffmpeg -i 3009_20080207205900.mpg

Input #0, mpeg, from '3009_20080207205900.mpg':
   Duration: 00:58:59.3, start: 0.298589, bitrate: 3569 kb/s
     Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 
DAR 16:9], 15000 kb/s, 25.00 tb(r)
     Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 256 kb/s
     Stream #0.2[0x1c1]: Audio: mp2, 48000 Hz, mono, 64 kb/s

and in the working directory:

ffmpeg -i VTS_02_1.VOB

Input #0, mpeg, from 'VTS_02_1.VOB':
   Duration: 00:38:45.1, start: 0.160000, bitrate: 3694 kb/s
     Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 64:45 
DAR 16:9], 15000 kb/s, 25.00 tb(r)
     Stream #0.1[0x80]: Audio: liba52, 48000 Hz, stereo, 192 kb/s
     Stream #0.2[0x81]: Audio: liba52, 48000 Hz, mono, 192 kb/s

Thanks to Paul H for the recent native-mode patch.

John P









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