[FFmpeg-devel] [PATCH] avcodec/pnm: avoid mirroring PFM images vertically

[Leo Izen]

On 11/22/22 11:46, Leo Izen wrote:
> On 11/16/22 06:43, Leo Izen wrote:
>> PFM (aka Portable FloatMap) encodes its scanlines from bottom-to-top,
>> not from top-to-bottom, unlike other NetPBM formats. Without this
>> patch, FFmpeg ignores this exception and decodes/encodes PFM images
>> mirrored vertically from their proper orientation.
>>
>> For reference, see the NetPBM tool pfmtopam, which encodes a .pam
>> from a .pfm, using the correct orientation (and which FFmpeg reads
>> correctly). Also compare ffplay to magick display, which shows the
>> correct orientation as well.
>>
>> See: http://www.pauldebevec.com/Research/HDR/PFM/ and see:
>> https://netpbm.sourceforge.net/doc/pfm.html for descriptions of this
>> image format.
>>
>> Signed-off-by: Leo Izen <leo.izen at gmail.com>
> 
> 
> Bumping for review, thanks.
> 
> - Leo Izen

Another bump, thanks.

- Leo Izen (thebombzen)