HI!
Recorded DVB-C mpeg files seem to be somehow corrupted or illegal. I can
watch them perfectly with mplayer and MythTV, but skipping/jumping
through them causes problems.
MythTV (using ffmpeg) reports most of the time things like this, but the
picture is visually OK:
[mpeg2video @ 0xb73fc7e4]skipped MB in I frame at 1 29
[mpeg2video @ 0xb73fc7e4]ac-tex damaged at 0 30
Using mplayer (libmpeg2) causes pixelization for a short moment after
the skip, but it does not report errors. When I switch MythTV from
ffmpeg to libmpeg2, it behaves the same (no error messages, but
pixelization).
Is this "normal"? As I said, it only happens when skipping, not when
playing.
I am using a KNC One DVB-C card (SAA7146, budget_av driver) in a Suse
10.1 machine (kernel 2.6.16.21-0.13-smp), DVB drivers were included with
that kernel.
dvbscan finds all channels and I can tune to all channels with czap with
this output for example:
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
reading channels from file 'channels.conf'
149 DAS
VIERTE:762000000:INVERSION_AUTO:6900000:FEC_NONE:QAM_64:2047:2048:1793
149 DAS VIERTE: f 762000000, s 6900000, i 2, fec 0, qam 3, v 0x7ff, a 0x800
status 1f | signal 9696 | snr eded | ber 00195000 | unc ffffffff |
FE_HAS_LOCK
status 1f | signal 9393 | snr eeee | ber 00195000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal 9393 | snr eded | ber 00195000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal 9393 | snr eeee | ber 00195000 | unc 00000000 |
FE_HAS_LOCK
The last line then repeats itself more or less (slight variations in snr).
According to kaffeine/xine, I have 48-62% signal strength and >90%
signal quality on all channels.
Thanks for any insights.
Thomas
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