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

[Gabri Nurtinaz Shally]

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.
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>>
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