Panasonic G30 - audio downmix?

[Forbix]

Is it possible to set up Mezzmo to automatically downmix AC3 5.1 to AC3 stereo?

I have a lot of HD ripps but most of them I can not stream to my G30 plasma TV since it do not understand multichannel audio.

[Paul]

Yes, you could modify the device profile and remove <channels>6</channels> from the "ac3" format. If you're not sure how to do that, let me know and I'll provide detailed instructions.

[Forbix]

Dear Dennis,
actualy I would like all multichanell audio to be downmixed to stereo since Panasonic TX-P42G30E does not support anything accept mono or stereo audio (both as streamed or locally USB pluged AV source). Could you make those changes in Panasonic Viera profile at least for AAC and AC3 audio which is most widely used.
How can I try to do it myself? Where are the media device profiles stored?

[Forbix]

Dear Dennis,
actualy I would like all multichanell audio to be downmixed to stereo since Panasonic TX-P42G30E does not support anything accept mono or stereo audio (both as streamed or locally USB pluged AV source). Could you make those changes in Panasonic Viera profile at least for AAC and AC3 audio which is most widely used.
How can I try to do it myself? Where are the media device profiles stored?

[Paul]

To see where device profiles are stored check this thread: http://forum.conceiva.com/showthread...ofiles-located

You'll need to remove read-only protection from the file (e.g. "PanasonicViera2011.prf" if you are using the "Panasonic Viera (2011 models)" device profile), then open it up with Notepad.

To downmix all multichannel sound to mono/stereo we'll need to add:

<channels>1</channels>
<channels>2</channels>

to all "audio" formats, thus telling Mezzmo that if there 5.1 or more, it should be transcoded. Does the manual for the TV specify that it only supports mono/stereo though? Our two Panasonic TVs here happily accept 5.1 audio, but they are different models to yours.

[Forbix]

The following multichannel audio should be supported on G30 at its USB:
-DTS,
-DD 5.1 (lossy),
Dolby Digital Plus / TrueHD 5.1 i 7.1.

Those should be downmixed by TV to stereo output since it has two speaker stereo output with possibility to activate V-audio Surround Pro mod for superior sound.

[Paul]

Does the TV complain when you try to play a 5.1 file though? Did you try the changes I posted above?

[Forbix]

I have made changes in Viera 2011 profile as you suggested. I need to download a few new movies and then I will post a review.
So far I have tested it with a sample of the movi Centurion which natively has DTS 5.1 sound. It was reproduced without transcoding (of the sound) but since this type of audio was supposed to be recognized even without profile modifications, I will continue to make tests and will post it here.

Centurion.mkv
ffmpeg version N-33781-g35674a2, Copyright (c) 2000-2011 the FFmpeg developers
built on Oct 19 2011 10:31:16 with gcc 4.6.1
configuration: --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/media/ffmpeg --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread' --enable-runtime-cpudetect --extra-cflags=-I/home/dennis/cc/include --extra-ldflags=-L/home/dennis/cc/lib --pkg-config=pkg-config
libavutil 51. 22. 0 / 51. 22. 0
libavcodec 53. 21. 0 / 53. 21. 0
libavformat 53. 16. 1 / 53. 16. 1
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 44. 0 / 2. 44. 0
libswscale 2. 1. 0 / 2. 1. 0

Seems stream 0 codec frame rate differs from container frame rate: 47.95 (5994/125) -> 23.98 (24000/1001)
Input #0, matroska,webm, from 'F:\Torrs\MKV\sample.mkv':
Duration: 00:01:16.91, start: 0.000000, bitrate: 3629 kb/s
Stream #0:0: Video: h264 (High), yuv420p, 1280x544, SAR 1:1 DAR 40:17, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Stream #0:1: Audio: aac, 44100 Hz, 5.1, s16 (default)
At least one output file must be specified


---> DB Level Info: 30, 100
---> Frame rate: 23.98
---> Aspect ratio: 40:17

[Forbix]

CONNAN MKV (original) - needs trancoding ?!

ffmpeg version N-33781-g35674a2, Copyright (c) 2000-2011 the FFmpeg developers
built on Oct 19 2011 10:31:16 with gcc 4.6.1
configuration: --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/media/ffmpeg --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread' --enable-runtime-cpudetect --extra-cflags=-I/home/dennis/cc/include --extra-ldflags=-L/home/dennis/cc/lib --pkg-config=pkg-config
libavutil 51. 22. 0 / 51. 22. 0
libavcodec 53. 21. 0 / 53. 21. 0
libavformat 53. 16. 1 / 53. 16. 1
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 44. 0 / 2. 44. 0
libswscale 2. 1. 0 / 2. 1. 0

Seems stream 0 codec frame rate differs from container frame rate: 47.95 (20000000/417083) -> 23.98 (24000/1001)
Input #0, matroska,webm, from 'F:\Torrs\Finished\Conan.The.Barbarian.2011.BluRay .1080p.DTS.x264-CHD\Conan.The.Barbarian.2011.BluRay.1080p.DTS.x264-CHD.mkv':
Duration: 01:52:42.75, start: 0.000000, bitrate: 12701 kb/s
Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x800, SAR 1:1 DAR 12:5, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
Metadata:
title : Conan.The.Barbarian.2011
Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), s16, 1536 kb/s (default)
Metadata:
title : DTS-CORE 1536K
At least one output file must be specified


---> DB Level Info: 41, 100
---> Frame rate: 23.98
---> Aspect ratio: 12:5

P.S.
In the profile is the option to output of AC3 and mp3 sound as stereo. I do not see the same option for AAC or DTS ?!

[Forbix]

I 've had to manualy transcode audio DTS 5.1 to stereo AC3. Otherwise, the Mezzmo trancoded it itself but in that case it was not possible to activate integrated subtitle.
So, it seems that no transcoding is allowed if I want to see subtitles, right?

Can You recreate a profile for Panasonic Viera 2011 (for TX-P42G30) with all the neccessary changes which will automatically perform mixdown of all multichanell audio to stereo, please. This TV has V-Audio Surround and 2 x 10 watt speakers.