[FFmpeg-devel] 1 bpp BMP sample with palette in the 'bmp' directory of the FATE test suite

Paul B Mahol onemda at gmail.com
Tue Jan 26 10:55:58 CET 2016

On 1/26/16, Mats Peterson <matsp888-at-yahoo.com at ffmpeg.org> wrote:
> On 01/26/2016 10:42 AM, Mats Peterson wrote:
>> I discovered a 1 bpp BMP file with a palette called 'test1.bmp' in the
>> 'bmp' directory of the FATE test suite. When converting this file with,
>> say, "ffmpeg -i test1.bmp test.avi", the output file will use the colors
>> of the palette in the BMP file, not black & white. Also, the pixel
>> format used for the file is pal8, not monow. This leads me to believe we
>> should use pal8 for raw 1 bpp video in AVI in rawdec.c as well, in spite
>> of Microsoft's use of the word "monochrome". But then again, the pal8 to
>> yuv420p conversion discrepancies, using 0x10 and 0xEB instead of 0x00
>> and 0xFF as the output values, will have to get fixed, in order to pass
>> the FATE test suite. This is nothing urgent, of course.
>> Mats
> I should add that opening this file in Paint in Windows XP will show the
> colors properly, not just black & white.

Who still use pal8 today? Only you.

> Mats
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