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DVB-T and suckage
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Gareth
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DVB-T and suckage
Long story short:
I have a working arial, but the BBC encrypt all the HD streams and on top of that it seems I have the terrible luck to pick the weakest possible signal for BBC 3 when recording, and have a corrupted glitchy horrible mess as a result.
Just ranting out loud.
“Lanie, I’m going to print more printers. Lots more printers. One for everyone. That’s worth going to jail for. That’s worth anything.” - Printcrime by Cory Doctrow
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| 09-09-2012 09:05 AM |
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Gareth
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RE: DVB-T and suckage
As an example of what I mean, look at this when I change to the default BBC3 for recording, the one broadcast from a transmitter that's technically out of range in my area:
cycle: 229 d_time: 0.112 s Sig: 44975 SNR: 64764 BER: 12286 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 230 d_time: 0.112 s Sig: 44975 SNR: 64764 BER: 12130 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 231 d_time: 0.120 s Sig: 44975 SNR: 64507 BER: 12052 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 232 d_time: 0.168 s Sig: 44975 SNR: 64764 BER: 12156 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 233 d_time: 0.164 s Sig: 44975 SNR: 64507 BER: 11856 UBLK: 0 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 234 d_time: 0.112 s Sig: 45232 SNR: 64764 BER: 11916 UBLK: 0 Stat: 0x00 []
cycle: 235 d_time: 1.540 s Sig: 36494 SNR: 63479 BER: 61452 UBLK: -1 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 236 d_time: 0.361 s Sig: 36494 SNR: 62965 BER: 70562 UBLK: -1 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 237 d_time: 0.111 s Sig: 36494 SNR: 63736 BER: 65914 UBLK: 43 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 238 d_time: 0.112 s Sig: 36494 SNR: 63993 BER: 63300 UBLK: -1 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
cycle: 239 d_time: 0.188 s Sig: 36494 SNR: 62965 BER: 68018 UBLK: -1 Stat: 0x1f [SIG CARR VIT SYNC LOCK ]
The important bits here are the "Sig:" bit, which drops quite massively, and when I try to play the raw MPEG stream in mplayer I get this:
[mpeg2video @ 0x8ab2700]ac-tex damaged at 2 25
[mpeg2video @ 0x8ab2700]ac-tex damaged at 8 26
[mpeg2video @ 0x8ab2700]00 motion_type at 6 27
[mpeg2video @ 0x8ab2700]00 motion_type at 4 28
[mpeg2video @ 0x8ab2700]00 motion_type at 1 29
[mpeg2video @ 0x8ab2700]ac-tex damaged at 9 30
[mpeg2video @ 0x8ab2700]ac-tex damaged at 10 31
[mpeg2video @ 0x8ab2700]mb incr damaged
[mpeg2video @ 0x8ab2700]ac-tex damaged at 8 33
[mpeg2video @ 0x8ab2700]00 motion_type at 10 34
[mpeg2video @ 0x8ab2700]00 motion_type at 12 35
[mpeg2video @ 0x8ab2700]concealing 1395 DC, 1395 AC, 1395 MV errors
By comparision, live BBC 3 on the local transmitter there are precisely ZERO errors in the stream.
Kaffeine (the software I used for recording, naively assuming it'd use the good signal) is absolute rubbish.
“Lanie, I’m going to print more printers. Lots more printers. One for everyone. That’s worth going to jail for. That’s worth anything.” - Printcrime by Cory Doctrow
This post was last modified: 09-09-2012 09:15 AM by Gareth.
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| 09-09-2012 09:12 AM |
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Shnoing
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| 09-09-2012 12:33 PM |
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Gareth
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RE: DVB-T and suckage
Would this one http://en.wikipedia.org/wiki/VLC_media_player have the functionality you're looking for? I think I remember to have used it for encoding, but from a stream, not a TV signal.
VLC is what i've been using for viewing live, or mplayer - but recording is a bit more fiddly - you can record from DVB streams but it doesn't have scheduled recordings.
I can also write my own script for scheduling recordings, but there's got to be good software already out there for this. In fact, if I can get kaffeine to use the right transmitter, it otherwise works brilliantly - it's just the fact it uses the weakest signal it can which causes this issue.
“Lanie, I’m going to print more printers. Lots more printers. One for everyone. That’s worth going to jail for. That’s worth anything.” - Printcrime by Cory Doctrow
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| 09-09-2012 12:42 PM |
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Gareth
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RE: DVB-T and suckage
Would this one http://en.wikipedia.org/wiki/VLC_media_player have the functionality you're looking for? I think I remember to have used it for encoding, but from a stream, not a TV signal.
Oh, just a note - there's no difference between a digital TV stream, a DVD and a streaming MPEG2 video online - all use the same codec.
DVB just sends MPEG data over the air, sometimes with an annoying layer of crypto on top, it also streams other data such as EPG (Electronic Programme Guide) and subtitles.
“Lanie, I’m going to print more printers. Lots more printers. One for everyone. That’s worth going to jail for. That’s worth anything.” - Printcrime by Cory Doctrow
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| 09-09-2012 03:10 PM |
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Gareth
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RE: DVB-T and suckage
Managed to almost repair one recording:
“Lanie, I’m going to print more printers. Lots more printers. One for everyone. That’s worth going to jail for. That’s worth anything.” - Printcrime by Cory Doctrow
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| 09-10-2012 02:39 AM |
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Gareth
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RE: DVB-T and suckage
Look at the times on there - it makes no sense
“Lanie, I’m going to print more printers. Lots more printers. One for everyone. That’s worth going to jail for. That’s worth anything.” - Printcrime by Cory Doctrow
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| 09-10-2012 02:39 AM |
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Shnoing
Posts: 2,113
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RE: DVB-T and suckage
It must have been recorded on Mercury or Venus. 
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| 09-11-2012 09:35 PM |
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