[mythtv-users] Problems with audio in DVB transcodes

Kent Williams kent2 at optusnet.com.au
Sat Jan 24 23:03:49 EST 2004


I can't seem to get the audio in my DVB transcodes to work properly.
I've tried many different settings for the MPEG2 profile under
transcoders but each gives the same results.
For the 'MP3' codec I've tried sampling rates of 32kHz, 44.1kHz, and
48kHz.
One interesting point is that when changing the codec to 'uncompressed'
(only tried this with a sample rate of 48kHz) I still get the same
problem. This suggests to me that the problem is in the decoding?

I've created a short 30 second clip that can probably explain things
better:
http://scuznet.dyndns.org:8888/files/6005_20040121060000_20040121063000.
nuv

It was created with the following transcode settings:
Image size: 512x384
Codec: MPEG-4
Bitrate: 1900kbps
Max qual: 2
Min qual: 15
Max qual diff bet frames: 3
Scale bitrate for frame size: off
Enable hq: off
Enable 4MV: off
Audio codec: MP3
Sampling rate: 48kHz
MP3 qual: 7


The following is what is shown on mythbackend:
Input #0, mpeg, from
'/mnt/massstore/recordings/6005_20040121060000_20040121063000.nuv':
  Stream #0.0: Video: mpeg2video, 720x576, 25.00 fps
  Stream #0.1: Audio: mp2, 48000 Hz, stereo, 256 kb/s
2004-01-25 14:58:53 Fast-Forwarding from 0 to 5989
2004-01-25 14:59:23 Fast-Forwarding from 6739 to 53331
[mpeg2video @ 0x84290c8]invalid mb type in P Frame at 35 2
[mpeg2video @ 0x84290c8]concealing errors
[mpeg2video @ 0x84290c8]Warning MVs not available
2004-01-25 14:59:25 Transcoding
/mnt/massstore/recordings/6005_20040121060000_20040121063000.nuv done

Any help would be very much appreciated!

Cheers,
Kent


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