[streaming] Re: Other output messing the binary Stdout?

[Polyphem]

Hello Sigmund,

thanks for your answer. Nevertheless, it didnt work. This time the video is
playable, but very corrupted (lots of objects floating around). I invoked
VLC with following command line (WinXP, VLC 0.8.5):

vlc.exe test.mpeg -I dummy --dummy-quiet
--sout=#transcode{vcodec=mp2v,acodec=mp3}:standard{access=file,mux=ts,url='-'}
vlc:quit 1>test_out.mpeg

The output file is created but still corupt. Anyone got an idea left?

Best Regards


On 11/17/05, Sigmund Augdal Helberg <dnumgis at videolan.org> wrote:
>
> On Thu, 2005-11-17 at 11:19 +0100, Polyphem wrote:
> > Thanks for the answer Derk.
> > Does this really apply for all kind of codecs? I thougth that this
> > only applies to certain kinds like AVI, and that MPEG1 for example can
> > also be played without a correct header. And what is than the
> > difference to streaming a transcoded file over HTTP, there VLC also
> > can not go back to the header and correct it, because the information
> > is streamed permanently.
> > What makes me wonder is, that of a ~3MB large file only some 1-2 KB
> > seem to be different between output to STDOUT and output to a file.
> > And the difference is in the Header AND the Footer (last few KBs),
> > thats why i think some other stuff is messing it up, maybe some
> > line-breaks sent or something like that.
> Make sure that you use --quiet and that you do _not_ use the rc
> interface (at least not without --rc-host or --rc-socket or what those
> options are called). Even more do not use the ncurses interface or the
> aa/caca video outputs. Most likely it is the rc interface that messes
> stuff up for you, so try -I dummy next time.
>
> As for codecs and such this is somewhat complex. VLC can take different
> actions based on what output it is using. Some containers require no
> header at all (like mpeg2 ts) and is easily used for streaming purposes.
> Some require a simple header that can be generated up front, for these
> the header can be remembered so each time a client connects to http the
> header is sent first, then streaming data is sent. The final case is
> avi, mp4 etc. For these containers vlc will have to rewind and create a
> index at the start of the file after fully generating the contents.
>
> Sigmund
> > Best Regards
> >
> > On 11/16/05, Derk-Jan Hartman <hartman at videolan.org> wrote:
> > If you used --quiet you should be fine regardless.
> > I think it's more that stdout is a stream instead of a file,
> > so VLC
> > cannot go back in the file and update the headers with the
> > correct
> > information and stuff.
> >
> > DJ
> >
> > On 16-nov-2005, at 11:07, Polyphem wrote:
> >
> > > Hello VLC-Community,
> > >
> > > I'm currently playing around with the binary Stdout option
> > an run
> > > into a problem.
> > >
> > > When I use
> > > standard{access=file,mux=asf,url='test.mpeg'}
> > >
> > > the resulting local file is healthy and plays in VLC and
> > WMP. When
> > > I try to capture the binary output from Stdout with
> > >
> > > standard{access=file,mux=asf,url=-}
> > >
> > > and than create the movie with an external program, it is
> > > corrupted. I took hex look at the binaries and it seems that
> > 99.9%
> > > are identical. Only in the top 2-3 header rows and the
> > bottom 2-3
> > > footer rows the Stdout file looks sligtly different.
> > > I looked up the Stdout function here:
> > >
> > https://trac.videolan.org/vlc/file/trunk/modules/access_output/file.c
> > >
> > > Is it possible that these:
> > >
> > > msg_Dbg( p_access, "using stdout" );
> > > msg_Dbg( p_access, "file access output opened (`%s')",
> > p_access-
> > > >psz_name );
> > > msg_Dbg( p_access, "file access output closed" );
> > >
> > > come in my way? Are they also parsed to the Stdout and I
> > have to
> > > deactivate them somehow, or do those Messages need to be
> > invoked by
> > > a special debug option (which I did not found until now)?
> > >
> > > Anyone had this problem before? Is it possible that VLC
> > mixes other
> > > Stdout output into the stream? Invoked it with -q, --quiet,
> > but are
> > > there other parameters to tell VLC not to write other output
> > to
> > > Stdout?
> > >
> > > Thanks and Best Regards
> > >
> > >
> > >
> >
> > --
> > This is the streaming mailing-list, see
> > http://www.videolan.org/streaming/
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> >
> >
>
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