[MPlayer-advusers] DVB documentation unclear/outdated
lynx.abraxas at freenet.de
lynx.abraxas at freenet.de
Sun Feb 11 23:43:34 CET 2007
On 11/02/07 12:11:14, Nico Sabbi wrote:
> lynx.abraxas at freenet.de wrote:
> >How is that ment?
> now the description in video.xml is crystal-clear
Yepp. Now it's understandable. Thanks.
> >I don't think the examples show a way of transcoding to mpeg4 for they
> >have a video filter addition. Have a look for yourself.
> excerpt from video.xml_
> If you want to record it in a different format (re-encoding it) instead
> you can run a command such as
> mencoder -o <replaceable>r1.avi</replaceable> -ovc xvid -xvidencopts
> bitrate=800 .br > -oac mp3lame -lameopts cbr:br=128 -pp=ci
> change xvid with lavc and adjust the encoding options as you prefer to
> obtain mpeg4
I think there is a misunderstanding. I am using transcoding here for
"transcoding between MPEG-2 and MPEG-4 (partial decompression)" without
decoding to raw and then encoding to mpeg4 (as mentioned at the end of DVB-
doc). If I'm not mistaken decoding to raw and then encoding is called re-
encoding which is not transcoding. I'm though not sure if transrating would
apply here as well since they are both mpeg but not the same video formats. In
the excerpt it states re-encoding not transcoding and so it is for sure
mencoder's task but not what I am looking for.
> >>>6) Last there is "realtime transcoding between MPEG-2 and MPEG-4
> >>>decompression)" mentioned. It seems this is outdated. In my researches I
> >>>out that in 2002 it had been dropped off the ToDo-list. I couldn't
> >>>anything newer to that concerning mplayer/mencoder. Is it possible now?
> >>it's been possible since dvb:// and demux_ts were added to mplayer
> >Doing some research with your hint to demux_ts I wasn't able to find
> >examples or hints how to transcode my dvb input to a mpeg4 output-file.
> >You please provide some?What programme is in charge for transcoding
> >mplayer or
> >mencoder? (I know there is the programme transcode as well;))
I'm referring to this email from the thread here:
> >What uses demux_ts: -demuxer lavf or -demuxer mpegts?
> isn't the filename clear enough? demux_ts; anyway -demuxer lavf can be
> used to demux dvb streams, too
If one is new and unsure about things concerning DVB, demux_ts is confusing
since mplayer -demux help yields mpegts fitting to last lines of
libmpdemux/demux_ts.c but making not much sense to google hit for demux_ts
So I'm still wondering if anyhow one can use demux_ts with DVB-input to
achieve transcoding in the way I discribed above? So that I end up with an
mpeg4-file without re-encoding.
> >>>Finally: If I use the keys 'h' or 'k' to change the channel when watching
> >>>t mplayer changes it but then does not take any further input
> >Doing some tests I found out that only -vo xv,svga,aa,fbdev allow me to
> >'h' or 'k' to change the channel without dropping input reads. I am very
> >of the vidix driver. Is it a bug that it doesn't work with cvidix nor
> xvidix does accept 'h', 'k' and shows the osd menu. I use it every day
Sorry, my mistake. gmplayer -vo xvidix and 'h' or 'k' make mine crash but
mplayer -vo xvidix does work.
Contrary mplayer -vo cvidix and 'h' or 'k' make mplayer change the channel but
when showing the new channel it does not care about any key strokes any more.
I think this is somehow connected to dvb:// since 'h' or 'k' work forever if
I use them with v4l2 mplayer -vo cvidix tv:// -tv ...
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