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

[Bill Crockett]

On 24/09/2011 1:52 PM, Cristian Manea wrote:
> 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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I had exactly the same problem, but with MPlayer.  If I played an 
interlaced video with the "yadif" deinterlacing filter, or any 
deinterlacer, I would get the same display error.

What video output driver are you using?  I am using OpenGL.  If I 
changed to Directx, it did not do it.  If I appended the scale filter 
while using OpenGL, it also fixed it.  I found out that my video card is 
too old, and the only way to use it was to append the scale filter or go 
back to Directx.