[mythtv-users] Mythexport choosing wrong audio stream

[Stephen Robertson]

On Mon, Dec 3, 2012 at 5:40 PM, Karl Dietz
<dekarl at spaetfruehstuecken.org> wrote:
> On 03.12.2012 18:21, Stephen Robertson wrote:
>>
>> It seems that for some recordings the resultant video from mythexport
>> has the "wrong" audio track.  In my case I get an audio description
>> track.  I think this may be the first audio track and the normal audio
>> is on the second.  Is there a way tell mythexport which stream to use.
>
>
> Which version is that? (of MythTV and MythExport)
> Where do you source the recording from? (DVB-C/S/T of which country)
>
> Regards,
> Karl

Sorry for the vague information earlier

Mythexport  2.2.4-0ubuntu1

MythTV Version : v0.26.0-51-ged7b577
MythTV Branch : fixes/0.26
Network Protocol : 75
Library API : 0.26.20120822-1
QT Version : 4.8.1

I've seent this in
BBC HD from DVB-S2 in the UK

ffmpeg line from mythxport config:
 system("avconv -i \'$self->{_inputFile}\' -y -pass 1 -an -vcodec
libx264 -pre:v libx264-medium_firstpass -pre:v libx264-ipod640 -b
1500k -bt 1000k -threads 0 -s 800x480 -aspect 16:9 -f ipod '/dev/null'
&& avconv -i \'$self->{_inputFile}\' -y -pass 2 -vcodec libx264
-preset medium -pre:v libx264-ipod640 -b 1500k -bt 1000k -threads 0 -s
800x480 -acodec libfaac -ab 192k -ar 48000 -ac 2 -aspect 16:9 -f ipod
\'$self->{_outputFile}$self->{_extension}\'")


mediainfo otuput for a recording that exhibited this:
General
ID                                       : 2050 (0x802)
Complete name                            :
/media/disk/Recordings/8940_20121013202800.mpg
Format                                   : MPEG-TS
File size                                : 2.58 GiB
Duration                                 : 31mn 57s
Overall bit rate                         : 11.5 Mbps

Video
ID                                       : 5500 (0x157C)
Menu ID                                  : 1 (0x1)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High at L4.0
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 4 frames
Codec ID                                 : 27
Duration                                 : 31mn 56s
Bit rate                                 : 10.5 Mbps
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 25.000 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : MBAFF
Bits/(Pixel*Frame)                       : 0.203
Stream size                              : 2.35 GiB (91%)
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio #1
ID                                       : 5501 (0x157D)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Mode extension                           : CM (complete main)
Format settings, Endianness              : Big
Codec ID                                 : 129
Duration                                 : 31mn 57s
Bit rate mode                            : Constant
Bit rate                                 : 192 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                         : Lossy
Delay relative to video                  : -853ms
Stream size                              : 43.9 MiB (2%)
Language                                 : English

Audio #2
ID                                       : 5502 (0x157E)
Menu ID                                  : 1 (0x1)
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 2
Codec ID                                 : 3
Duration                                 : 31mn 57s
Bit rate mode                            : Constant
Bit rate                                 : 256 Kbps
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 KHz
Compression mode                         : Lossy
Delay relative to video                  : -858ms
Stream size                              : 58.5 MiB (2%)
Language                                 : nar

Text #1
ID                                       : 5503 (0x157F)-888
Menu ID                                  : 1 (0x1)
Format                                   : Teletext Subtitle
Language                                 : English

Text #2
ID                                       : 5504 (0x1580)
Menu ID                                  : 1 (0x1)
Format                                   : DVB Subtitle
Codec ID                                 : 6
Duration                                 : 31mn 55s
Delay relative to video                  : 2s 378ms
Language                                 : English