[FFmpeg-user] Use of "-color_range"

[Tim Nicholson]

On 05/07/11 08:30, Thomas Worth wrote:
> On Mon, Jul 4, 2011 at 11:33 PM, Tim Nicholson<tim.nicholson at bbc.co.uk>  wrote:
>> On 04/07/11 18:13, Thomas Worth wrote:
>>>
>>> On Mon, Jul 4, 2011 at 7:44 AM, Tim Nicholson<tim.nicholson at bbc.co.uk>
>>>   wrote:
>>>>
>>>> I am struggling to find any documentation on the use of this and
>>>> searching
>>>> the source was not very revealing, to my eye at least.
>>>>
>>>> Apart from the fact that it expects an<int>    I am none the wiser.
>>>>
>>>> I since it is a DEV function I was hoping I could use it to force ffmpeg
>>>> to
>>>> handle source material of a non standard range.
>>>
>>> Regarding this and x264 encoding: I had some full range 4:2:2 material
>>> I was trying to encode with x264 a while back and found that if I
>>> forced the "yuvj420p" pix format, FFmpeg would pass full range values
>>> to x264. This was using x264 in pipe mode, but I don't see why it
>>> wouldn't work with libx264. I would get very different results when
>>> changing yuv420p to yuvj420p.
>>
>> Quite! Except that if you look at pixfmt.h it says (line 74)
>>
>> "PIX_FMT_YUVJ420P,  ///<  planar YUV 4:2:0, 12bpp, full scale (JPEG),
>> deprecated in favor of PIX_FMT_YUV420P and setting color_range"
>>
>> Which begs the original question.
>
> Does this help? From libavcodec/h264.c:
> [...]

I think Marks extract was a little more straightforward..... :)


-- 
Tim

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