[Ffmpeg-devel] FFmpeg + X264 questions

[David Shirley]

Thanks Herv?,

-threads 2 gave a little boost in performance - thanks (I didn't see
this option in the man page :()

in regards to interlacing I don't want to change P->I or I->P, I just
want to keep the original settings.

As I understand it x264 does support interlacing in its encoder but
ffmpeg either doesn't pass on the interlaced option or doesn't know
how to.

Also I have posted a x264 Q to the users list before but I didn't get
any response - i feel im on the bleeding edge here so i thought dev's
might have more insight :)

Thanks again.

Dave


On 8/19/06, herve.flores <herve.flores at free.fr> wrote:
>
> Le 19 ao?t 06 ? 13:07, David Shirley a ?crit :
>
> > Hi All,
> >
> > I am trying to convert a bunch of HDTV MPEG2 (DVB streams from
> > Australian TV) into H264 for space saving reasons.
> >
> > So far I am using the command :
> >
> > ffmpeg -qmax 26 -i input.mpg -f mpegts -vcodec h264 -acodec copy
> > output.mpeg
> >
> > The first thing I notice is it will only use 1 CPU rathern that 2CPU's
> > (I have a dual core system) I have compiled in pthreads to both x264
> > and ffmpeg and am running the latest SVN's of both -
>
> I use "-threads 2" on my computer (but it has 2 different proc, not a
> dual core like the new intel, I didn't try with this sort of proc)
>
> > Am I doing something wrong?
> >
> > The other thing I notice is that the resulting video has combing
> > artifacts - If I add "-deinterlace" then these go away - Can
> > x264/ffmpeg interlace the output? (-interlace results in a error)
> >
> > Cheers
> > Dave
>
> "-deinterlace" = removes all odd lines (or all par lines, I don't
> know in fact) and keeps the others = a progressive output
> if you want to write interlace in the header of your stream, use -top
> 1 (or top 0 depends of your source)
> I don't know what's "-interlace", but ffmpeg don't make interlace
> streams (= take a 50 progressive fps and transform it to a 25
> interlaced fps), take a look to the mjpegtools if you need it
>
> PS: I don't know what's happen to a h264 interlaced(how players read
> well this file), but the mpg wrapper can store interlaced information
>
> PS2: the "dev" list  is not the good list, use the "user list" ;-)
>
> bye
>
>
> Herv?
>
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