[mythtv-users] Preserve AC3 while Transcoding` HD Resordings

[Chris Everest]

On Mon, Feb 9, 2009 at 1:57 PM, Chris Everest <chriseverest at gmail.com>wrote:

> Hello fine MythTV users...  Here's my setup.  I use HD Homerun to record
> clear QAM on my mythbackend.  So we know we're starting with MPEG+AC3
> source.  I then do a 'light' transcode using the builtin mythtranscode
> jobs.  I preserve the "HD" resolution by transcoding to 1280x720, but use a
> lower bitrate so that it still looks decent on the big screen, but also
> still plays well on my SD frontends (Athlon 2800+).
>
> Here's the deal.
>
> I love the AC3 sound. I have full dolby digital in the main media room.
> However, when I choose the audio portion of my transcode job, I specify
> "Uncompressed" and "48000" on the sample rate.  Unfortunately, this
> transcodes it to something other than AC3 because I no longer get dolby
> digital, instead I get the old style Pro Logic spec on the receiver.
> Bummer.
>
> Do I need to use Project X?  Or start using the "Other Jobs" to get what I
> want?
>
> --
> Chris Everest
>
>

Also, here's the output from ffmpeg -i

ffmpeg -i 13283_20090205213100.nuv
FFmpeg version SVN-r16671, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
--mandir=/usr/share/man --enable-shared --enable-gpl --enable-postproc
--enable-swscale --enable-pthreads --enable-x11grab --disable-avisynth
--disable-libamr-nb --disable-libamr-wb --enable-libdc1394 --enable-libfaac
--enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame
--enable-libspeex --enable-libtheora --enable-libvorbis --enable-libx264
--enable-libxvid --extra-cflags=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic
-fPIC --disable-stripping
  libavutil     49.13. 0 / 49.13. 0
  libavcodec    52.11. 0 / 52.11. 0
  libavformat   52.24. 1 / 52.24. 1
  libavdevice   52. 1. 0 / 52. 1. 0
  libswscale     0. 6. 1 /  0. 6. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Jan 19 2009 05:47:17, gcc: 4.3.2 20081105 (Red Hat 4.3.2-7)

Seems stream 0 codec frame rate differs from container frame rate: 1000.00
(1000/1) -> 29.97 (30000/1001)
Input #0, nuv, from '13283_20090205213100.nuv':
  Duration: 01:10:59.98, start: 83129.864000, bitrate: 1411 kb/s
    Stream #0.0: Video: mpeg4, yuv420p, 1280x720, 29.97 tb(r)
    Stream #0.1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
At least one output file must be specified



-- 
Chris Everest
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