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| author | Leo Izen <leo.izen@gmail.com> | 2022-11-16 06:43:06 -0500 |
|---|---|---|
| committer | James Almer <jamrial@gmail.com> | 2022-12-27 10:41:25 -0300 |
| commit | cd9dd0300639689630171893b3dfb6c9ba63a692 (patch) | |
| tree | 6bb3415330e46f9825f685781406f547efad7352 /libavdevice/dshow_filter.c | |
| parent | 64007595dcb5bb3c5f7bfa74d0b0f2e378f6007e (diff) | |
| download | ffmpeg-cd9dd0300639689630171893b3dfb6c9ba63a692.tar.gz | |
avcodec/pnm: avoid mirroring PFM images vertically
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@gmail.com>
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: James Almer <jamrial@gmail.com>
Diffstat (limited to 'libavdevice/dshow_filter.c')
0 files changed, 0 insertions, 0 deletions