[FFmpeg-devel] [PATCH 4/4] ffmpeg: pass decoded or filtered AVFrame to output stream initialization

[James Almer]

On 9/15/2020 1:21 PM, Jan Ekström wrote:
> On Tue, Sep 15, 2020 at 5:28 PM Jan Ekström <jeebjp at gmail.com> wrote:
>>
>>
>> Further looking into this, it seems to come from filtering (?) (diff attached)
>>
>> decoded AVFrame: 128x128, pix_fmt: rgba, range: pc
>> while...
>> AVFrame to be encoded: 128x128, pix_fmt: bgra, range: tv
>>
>> Jan
> 
> For the record, the culprit seems to be this piece of logic within
> libavfilter/vf_scale.c:
> http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavfilter/vf_scale.c;h=58eee967440657798f84383ec6f79e8a05c3ece0;hb=HEAD#l747
> 
> Only input has range defined, out_full never gets set to nonzero.
> Thus,
> out->color_range = out_full ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG
> leads to AVCOL_RANGE_MPEG.

Would changing that to out->color_range = scale->out_range help, or
break things too much?

> 
> Jan
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