[MEncoder-users] what video output to select for mencoder when encoding dvd's to h.264

[Cristian Manea]

but if I append -vf scale to the filter list, mencoder outputs the same
message:

Could not find matching colorspace - retrying with -vf scale...
> Opening video filter: [scale]
> The selected video_out device is incompatible with this codec.
> Try appending the scale filter to your filter list,
> e.g. -vf spp,scale instead of -vf spp.


 but with one additional line:

[swscaler @ 0x8a38540]using unscaled yuv420p -> yuv420p special converter


"James Hastings-Trew" from this mailing list, told me to use "-vf
format=i420", but I get the same output message. I tried selecting another
codec using "-vc mpeg12" and "-vfm libmpeg2 -vc mpeg12", but both mencoder
and mplayer are unable to continue, they exit with "MPlayer interrupted by
signal 11 in module: decode_video", and "Carl Eugen Hoyos" from this mailing
list, suggested me to compile mencoder from source. I haven't tried that
yet.

On Mon, Sep 26, 2011 at 2:03 AM, Gabri Nurtinaz Shally
<gabri.ns at gmail.com>wrote:

> the resulted video stream is probably YV12 which is doesn't supported by
> 'output device' x264 encoder. try add -vf scale to convert the stream to
> RGB
> On Sep 26, 2011 5:56 AM, "Cristian Manea" <cristian.manea348 at gmail.com>
> wrote:
> > Yes, 720x540 is 4:3, not 16:9 like I said previously by mistake. I knew
> that
> > vobs store aspect ratio, just like mkv, but I didn't knew that mencoder
> > doesn't use -vo wich I learned now that it is mplayer only. But I assumed
> it
> > uses -vo because there's this message that mencoder outputs: "The
> selected
> > video_out device is incompatible with this codec", wich probably means
> that
> > I should force other codec than default, for decoding...
> >
> > On Mon, Sep 26, 2011 at 1:28 AM, The Wanderer <wanderer at fastmail.fm>
> wrote:
> >
> >> On 09/25/2011 04:54 PM, Cristian Manea wrote:
> >>
> >> There is something that I don't understand about MEncoder. By default,
> >>> MEncoder and MPlayer both use xv as video output. But, for example,
> when
> I
> >>> open a dvd title or vob file in MPlayer, it scales it to a 16:9
> >>> resolution:
> >>>
> >>
> >> According to my understanding (which could be inaccurate), that's
> because
> >> something - possibly the file itself - asked for a 16:9 aspect ratio,
> even
> >> though the actual video data was encoded with a different aspect ratio.
> >>
> >>
> >> Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
> >>>> VO: [xv] 720x480 => 720x540 Planar YV12
> >>>>
> >>>
> >> I don't see a 16:9 aspect ratio in there. 720x480 is 3:2, and 720x540 is
> >> 4:3.
> >>
> >>
> >> So, my first question is: do I have to use a different video output that
> >>> xv
> >>> when encoding DVD's/mpeg2 streams to H.264 using MEncoder with x264 ?
> >>> Maybe a
> >>> video output that doesn't scale 720x480 to 720x540 and leave all frames
> >>> unscaled ?
> >>>
> >>
> >> This question doesn't make any sense.
> >>
> >> MPlayer decodes and displays the video. To do the display, it uses a VO
> >> method.
> >>
> >> MEncoder decodes and encodes the video, without displaying anything but
> the
> >> console-window text. Because it doesn't display the video, it doesn't
> need
> >> to
> >> use a VO method, and doesn't. (Or I'd be exceedingly surprised to learn
> >> that it
> >> did.)
> >>
> >> --
> >> The Wanderer
> >>
> >> Warning: Simply because I argue an issue does not mean I agree with any
> >> side of it.
> >>
> >> Secrecy is the beginning of tyranny.
> >> ______________________________**_________________
> >> MEncoder-users mailing list
> >> MEncoder-users at mplayerhq.hu
> >> https://lists.mplayerhq.hu/**mailman/listinfo/mencoder-**users<
> https://lists.mplayerhq.hu/mailman/listinfo/mencoder-users>
> >>
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