#9873: line stride does not appear to always match width in frei0r
-------------------------------------+-------------------------------------
Reporter: Brendan | Type: defect
Hack |
Status: new | Priority: normal
Component: avfilter | Version: git-
| master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
I am trying to run a frei0r filter that transforms pixels around the frame
(rather than just changing their colour) and on certain frame resolutions
I get garbage output. It looks like the provided frame has a stride that
does not match the frame width like frei0r requires. This is a regression
as this functionality works for all resolutions in ffmpeg 5.0.1.
Test data is an image of resolution 1800x1200 (test.jpg) and the same
image at 400x266 (test-400.jpg).
The bug was introduced in commit 17a59a634c39b00a680c6ebbaea58db95594d13d
and affected all resolutions. I am testing using the simple flippo frei0r
plugin that just flips the image horizontally or vertically. In these
tests I flip horizontally.
Checkout to commit 17a59a634c39b00a680c6ebbaea58db95594d13d and test as
follows:
{{{
$ ffmpeg -i test.jpg -filter frei0r=flippo:y -y test-ff-flip-
g17a59a634c.jpg
$ ffmpeg -i test-400.jpg -filter frei0r=flippo:y -y test-ff-
flip-400-g17a59a634c.jpg
}}}
Both of these images come out corrupted.
Commit d353909e773ba8a8201fa13d6c35251351dd567a purports to fix this by
copying to a frei0r compliant frame however this only fixes the problem
for the 400 width image. The 1800 is still corrupt.
Checkout to commit d353909e773ba8a8201fa13d6c35251351dd567a and test as
follows:
{{{
$ ffmpeg -i test.jpg -filter frei0r=flippo:y -y test-ff-flip-
gd353909e77.jpg
$ ffmpeg -i test-400.jpg -filter frei0r=flippo:y -y test-ff-
flip-400-gd353909e77.jpg
}}}
Here the 400 image is good but not the 1800.
The same tests run in the current master
c469c3c3b18fbacd6ee0165573034d2a0408b83f produce the same results.
Checkout to commit c469c3c3b18fbacd6ee0165573034d2a0408b83f and test as
follows:
{{{
$ ffmpeg -i test.jpg -filter frei0r=flippo:y -y test-ff-flip-HEAD.jpg
$ ffmpeg -i test-400.jpg -filter frei0r=flippo:y -y test-ff-
flip-400-HEAD.jpg
}}}
Here the 400 image is good but not the 1800.
{{{
$ ffmpeg -v 9 -loglevel 99 -i test.png
ffmpeg version N-107787-gc469c3c3b1 Copyright (c) 2000-2022 the FFmpeg
developers
built with gcc 9 (Ubuntu 9.3.0-17ubuntu1~20.04)
configuration: --prefix=/home/bendy/.local --arch=amd64 --enable-gpl
--disable-stripping --enable-frei0r --enable-shared
libavutil 57. 33.101 / 57. 33.101
libavcodec 59. 42.101 / 59. 42.101
libavformat 59. 30.100 / 59. 30.100
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 46.103 / 8. 46.103
libswscale 6. 8.102 / 6. 8.102
libswresample 4. 8.100 / 4. 8.100
libpostproc 56. 7.100 / 56. 7.100
Input #0, image2, from 'test.jpg':
Duration: 00:00:00.04, start: 0.000000, bitrate: 162876 kb/s
Stream #0:0: Video: mjpeg (Baseline), yuvj444p(pc,
bt470bg/unknown/unknown), 1800x1200 [SAR 1:1 DAR 3:2], 25 fps, 25 tbr, 25
tbn
At least one output file must be specified
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9873>
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