[mythtv-users] mythtranscode and wrong aspect ratio

[Markus Schulz]

hello,

i've tried to convert mpeg2 (720x576 anamorphic 16/9) to mpeg4 with 
mythtranscode without luck so far.

***********************************************
Source file:
# mplayer -identify -frames 1 -vo null -ao null 29664_20071118154631.mpg
...
VIDEO:  MPEG2  720x576  (aspect 3)  25.000 fps  15000.0 kbps (1875.0 
kbyte/s)
ID_FILENAME=29664_20071118154631.mpg
ID_DEMUXER=mpegts
ID_VIDEO_FORMAT=0x10000002
ID_VIDEO_BITRATE=15000000
ID_VIDEO_WIDTH=720
ID_VIDEO_HEIGHT=576
ID_VIDEO_FPS=25.000
...
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
ID_VIDEO_ASPECT=1.7778
VO: [null] 720x576 => 1024x576 Mpeg PES 


***********************************************
Transcode process:
# mythtranscode --chanid 29664 --starttime 20071118154631 --profile 
54 --outfile test.nuv
2007-11-20 01:36:31.379 Using runtime prefix = /usr
2007-11-20 01:36:31.419 Empty LocalHostName.
2007-11-20 01:36:31.460 New DB connection, total: 1
2007-11-20 01:36:31.474 Enabled verbose msgs: important
2007-11-20 01:36:31.478 New DB connection, total: 2
2007-11-20 01:36:31.508 Using protocol version 36
2007-11-20 01:36:31.796 Resizing from 720x576 to 720x576
2007-11-20 01:36:31.991 mythtranscode: 0% Completed @ 0 fps.
2007-11-20 01:36:51.994 mythtranscode: 59% Completed @ 31.3669 fps.

***********************************************
After this the final test.nuv:
...
VIDEO:  [DIVX]  720x576  10bpp  25.000 fps    0.0 kbps ( 0.0 kbyte/s)
ID_FILENAME=test.nuv
ID_DEMUXER=lavfpref
ID_VIDEO_FORMAT=DIVX
ID_VIDEO_BITRATE=0
ID_VIDEO_WIDTH=720
ID_VIDEO_HEIGHT=576
ID_VIDEO_FPS=25.000
ID_VIDEO_ASPECT=2.2222
ID_AUDIO_FORMAT=LAME
ID_AUDIO_BITRATE=128000
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2
ID_LENGTH=671.36
...
Movie-Aspect is 2.22:1 - prescaling to correct movie aspect.
ID_VIDEO_ASPECT=2.2222
VO: [null] 720x576 => 1280x576 Planar YV12 

***********************************************
Transcoder settings:
# echo "SELECT * FROM codecparams c where profile = 54"|mysql 
mythconverg
profile name    value
54      encodingthreadcount     1
54      hardwaremjpeghdecimation        4
54      hardwaremjpegquality    100
54      hardwaremjpegvdecimation        4
54      height  576
54      mp3quality      7
54      mpeg2aspectratio        4:3
54      mpeg2bitrate    4500
54      mpeg2maxbitrate 6000
54      mpeg2streamtype MPEG-2 PS
54      mpeg4bitrate    1000
54      mpeg4maxquality 2
54      mpeg4minquality 15
54      mpeg4option4mv  0
54      mpeg4optionidct 0
54      mpeg4optionime  0
54      mpeg4optionvhq  0
54      mpeg4qualdiff   3
54      rtjpegquality   170
54      samplerate      48000
54      scalebitrate    1
54      transcodelossless       0
54      transcoderesize 1
54      volume  80
54      width   0


Aspect changed from:
ID_VIDEO_ASPECT=1.7778
to
ID_VIDEO_ASPECT=2.2222

any ideas how to prevent this?

-- 
Markus Schulz

Unix gives you just enough rope to hang yourself - and then acouple more 
feet, just to be sure.
-- Eric Allman