[linux-dvb] Re: MPEG2 capture? good format?

[Dariush Forouher <dariush@forouher.de>]

On Thu, 2002-07-25 at 14:05, Chris Pitchford wrote:
> 
> Hi all,
> 
> I'm just wondering if anyone has any opinions on what I'm trying to do.
> 
> I'm using a Nova-T card, which sadly has no TV-out option. I'm also trying
> to capture TV programs, for later transcoding to smaller formats
> (Mpeg4/mpeg1), basically a crude PVR. Being a beginner I'm using
> DVBstream-0.4pre2..
> 
> dvbstream -f freq <vpid> <apid>   to grab the appropriated channel
> 
> dumprtp | ts2ps <vpid> <apid> | tee source.mpg | mplayer -cache 4096 -
> 	to capture the stream and dump to a file
> 
> The resultant source.mpg file, although plays under MPlayer and XINE,
> isn't recognised by trancode (which I was hoping to use to transcode into
> MPEG1 streams)
> 
> I've noticed the mplex tool that is in the apps/mpegtools directory of the
> driver. I was hoping I might be able to use this to "repair" or alter the
> source.mpg file into a format that may be compatible with transcode. Or
> alternatively just use mplex itself (since it does mention MPEG1 formats
> such as vcd)
> 
> When I attempt to use the tool, it complains the file is notusable:
> 
> # mplex -f 0 -o mpeg1.mpg source.mpg
>    INFO: [mplex] mplex version 2.2.1 ($Date: 2002/02/04 19:06:14 $)
> **ERROR: [mplex] File source.mpg unrecogniseable!
> **ERROR: [mplex] Unrecogniseable file(s)... exiting.
> 
> I've also tried the NEWSTRUCT driver's version of mplex, which works:
> 
> mplex -t MPEG1 -i PS_STREAM -o mpeg1.mpg source.mpg
> 
> but the resultant file has digital artifacts and errors when playing back
> under Mplayer/Xine that the source.mpg file does not exhibit.
> 
> I'm just wondering if anyone has any pointers for a good route for
> grabbing a program and transcoding to MPEG1 (perferably with transcode)
> 
> I'm currently looking at DTV and VDR, though these seem to require a card
> with tv out.. In the mean time, any pointers would be greatly appreciated.
> 
> On another note I have manged to get my Wintv/pvr and Nova-t cards working
> correctly. Thanks to all for the help. In the end a renaming of tuner.o to
> dvbtuner.o and an alteration to the order in which modules were loaded
> seems to have fixed the problem
There are several scripts(e.g. http://ma.hoff.bei.t-online.de/2divx)
available that transcode vdr recordings to divx or svcd. mplayer has the
capability to decode dvb streams, so mencoder can be used for this.

BTW: MPEG1 has even worse compression than MPEG2, that is used for DVB.
It would make no sense to use it.

ciao
Dariush
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