[FFmpeg-devel] [PATCH v7] lavc/rawdec: Remove monowhite switching code for 1 bpp AVI without a palette

[Mats Peterson]

On 02/11/2016 02:14 AM, Michael Niedermayer wrote:
> On Thu, Feb 11, 2016 at 01:15:38AM +0100, Mats Peterson wrote:
>> On 02/11/2016 01:11 AM, Mats Peterson wrote:
>>> On 02/11/2016 12:07 AM, Mats Peterson wrote:
>>>> For black & white AVI or QuickTime files, in order to produce a
>>>> monochrome nut file, force the pixel format with "-pix_fmt monow" or
>>>> "-pix_fmt monob".
>>>>
>>>> Unfortunately, there is a problem with converting from pal8 to monow,
>>>> and I know what it is now. There seems to be some weird dithering going
>>>> on of the white color, so there will be black pixels here and there in
>>>> the monow output. A better way is to use "ffmpeg -i 1bpp.avi -vcodec
>>>> copy -vtag B1W0 1bpp.nut". The "-vtag" option is currently needed,
>>>> otherwise FFmpeg will use a RGB[15] codec tag for some reason.
>>>>
>>>
>>> An alternative is to use "-sws_dither none", it seems to work fine. I
>>> just don't understand why the fully white color is dithered at all when
>>> converting from pal8 to monow.
>>>
>>
>> Nope, doesn't work. I forgot to use "-pix_fmt monow", and it's the
>> same as before.
>
> have you tried updating your git checkout ?
> it might be fixed by: 23261e60014908da7446e9b5bc7401dc30fdecd6
>

I just pulled the latest. Let's see what happens. It seems you've 
changed the *bpp1 files in tests/ref/vsynth for some reason. I'm 
creating a new patch here, since the old one will fail.

Mats