[MEncoder-users] MEncoder outputs "could not find matching colorspace"

[Cristian Manea]

If I add

-vf format=i420
>

to mencoder or mplayer, they still output

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 if I add the scale filter, there is one additional message in the
output:

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

what is i420 ? why i420 ? is x264 requiring a video format different than
that of an mpeg2/vob/dvd video stream ? if so, how do I determine the right
type of conversion, in order to convert from the format of the source to a
format that x264 accepts as input ? I have't seen these type of colorspace
conversions in the filter list of other mencoder users, or in the manual...

On Sat, Sep 24, 2011 at 6:01 AM, James Hastings-Trew <jimht at shaw.ca> wrote:

> On 11-09-23 7:59 PM, Cristian Manea wrote:
>
>> 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.
>>>
>>>  In MPlayer manual it says that the scale filter "Scales the image with
>> the
>> software scaler (slow) and performs a YUV<->RGB colorspace conversion".
>> From
>> this, I understand that it converts the source frames to RBG before
>> sending
>> them to x264, but I don't know if this conversion is necessary, therefore,
>> I
>> don't know if the scale filter is needed, but even if I add it, mencoder
>> tells me to add it.
>> _____________________
>>
>
> Try adding this instead: |-vf format=i420
>
>
> |
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