On 11/29/22 06:14, Anton Khirnov wrote:
Quoting Leo Izen (2022-11-16 12:43:06)
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.i...@gmail.com>
---
libavcodec/pnmdec.c | 10 ++++++++++
libavcodec/pnmenc.c | 18 ++++++++++--------
tests/ref/lavf/gbrpf32be.pfm | 2 +-
tests/ref/lavf/gbrpf32le.pfm | 2 +-
tests/ref/lavf/grayf32be.pfm | 2 +-
tests/ref/lavf/grayf32le.pfm | 2 +-
6 files changed, 24 insertions(+), 12 deletions(-)
Looks reasonable, will push soonish.
I got a LGTM, can someone push this? Thanks.
- Leo Izen (thebombzen)
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