[linux-dvb] Bad TS from dvb-t recording?

Greg 'groggy' Lehey grog at lemis.com
Fri Mar 9 02:09:45 CET 2007

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On Thursday,  8 March 2007 at 17:03:40 +0100, Torbjrn Lundquist wrote:
> Hi,
> I'm trying to make a recording from my dvb-t card (Avermedia). I do like
> this:
>> tzap -r -c channels.conf -t 5 -o test.ts SVT24
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> reading channels from file 'channels.conf'
> tuning to 522000000 Hz
> video pid 0x04e1, audio pid 0x04e0
> status 00 | signal 58cf | snr 0000 | ber 00000000 | unc 00000000 | copied 1708168 bytes (333 Kbytes/sec)
> status 1f | signal f1cf | snr c0c0 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> But then I cannot view the file in VLC for instance. If I run dvbsnoop on it
> I receive some errors, for instance:
> MPEG-DescriptorTag: 63 (0x3f)  [= ITU-T.Rec.H.222.0|ISO/IEC13818-1 Reserved]
>            Descriptor_length: 199 (0xc7)
>              ----> ERROR: unimplemented descriptor (mpeg context), Report!

This sounds like vlc's way of saying "I don't understand MPEG TS".

> I live in Sweden and receive the signal from the Motala-tranciever.

I don't think that this is related to the transmitter.

> What am I doing wrong? Or can I use some other program for recording (I
> tried mencoder without success)?

I do almost exactly this and view the result with mplayer, which
recognizes it without problems.  Note that the timing information in
the stream can be crazy (here, for some reason, it wraps around about
every 26½ hours).  I've done a few patches to mplayer to try to
display saner times, but they don't work all the time.

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