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

[Rene Bartsch <linux-dvb@bartschnet.de>]

Am Don, 2002-07-25 um 23.24 schrieb Chris Pitchford:
> On 25 Jul 2002, Dariush Forouher wrote:
> 
> > 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.
> 
> Hi again,
> 
> I don't think I can use VDR since I have no DVB card with a MPEG-decoder.
Correct.
> I've looked briefly at VDR and KVDR, but so far have had little luck..
> thoguh I would like to get it working, but thats a different matter.

Curretly VDR is restructured. The new API-version will allow new
output-device-plugins (DXR3, X11, ...) within the next months.
> 
> In saying that I did indeed manage to use the "stock" mplex this evening
> to translate a TS stream into a MPEG2 file, which I believe I can then
> transcode .. using transcode. Problem may be solved...

You could also use the -ps option with dvbstream to directly get a
MPEG-PS-stream.

Mencoder can directly produce the A/V-files for (S)VCD.
> 
> the reason for using MPEG1 is purely a VCD issue. Currently the DVD player
> I have access too is VCD compatible, but sadly not SVCD compatibly.
> Ideally something like FFMPegs MPEG4 codec would be good for longer-term
> online storage, though SVCD I imagine would be best for storage on an
> optical disc..
> 
> I aggree, MPEG1 is a poor choice, but is necessity more than anything else
> 
> Thanks
> 
> Chris
> 
> 
> >
> > ciao
> > Dariush
> > --
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> >
> >
> >
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> >
> 
> 
> 
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