For quite a while I occasionally got bitten by an annoying problem
(I am not sure, whether the behavior of dvbcut actually changed;
maybe I was just lucky before):

At least here (Berlin), many TV stations provide more than 1 audio
stream. Usually, in addition to the "normal" sound (track 0, 192 kbit)
there is a second track with a lower bitrate carrying a description
for visually impaired people or the like). For "arte" for example, it
looks like this:

[tcprobe] MPEG packetized elementary stream (PES)
[tcprobe] summary for test.ts, (*) = not default, 0 = not detected
import frame size: -g 720x576 [720x576]
     aspect ratio: 16:9 (*)
       frame rate: -f 25.000 [25.000] frc=3
                   PTS=2961.4172, frame_time=40 ms, bitrate=15000 kbps
      audio track: -a 0 [0] -e 48000,16,2 [48000,16,2] -n 0x50 [0x2000] (*)
                   PTS=2960.7474, bitrate=192 kbps
                   -D 16 --av_fine_ms 29 (frames & ms) [0] [0]
      audio track: -a 0 [0] -e 48000,16,2 [48000,16,2] -n 0x50 [0x2000] (*)
                   PTS=2960.7325, bitrate=128 kbps
                   -D 17 --av_fine_ms 4 (frames & ms) [0] [0]

(I put a little data snippet on http://user.cs.tu-berlin.de/~gator/tmp/test.ts
for illustration).

Every other program sees the tracks in this order (and uses track 0 by
default).In dvbcut however, the tracks are sometimes swapped, so if I
export just track 0, I actually end up with the second track. Furthermore,
in some cases when I notice the problem in time and explicitly choose only
track 1, I get (at least as far as my DVD player is concerned) 2 audio tracks,
of which track 0 (which is played by default) is empty.

Any idea, what is the problem here and what to do about it?

Regards,
                        Peter Daum




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