[FFmpeg-trac] #7818(ffmpeg:new): crop filter can't do single pixel width
FFmpeg
trac at avcodec.org
Thu Mar 28 19:48:01 EET 2019
#7818: crop filter can't do single pixel width
-------------------------------------+----------------------------------
Reporter: adaerr | Owner:
Type: defect | Status: new
Priority: normal | Component: ffmpeg
Version: git-master | Resolution:
Keywords: crop filter | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by adaerr):
Additional observation:
The bug is not observed when using lavfi's testsrc instead of color. That
is,
{{{
ffmpeg -report -f lavfi -i testsrc -vf crop=1:70 -vframes 1 -y slice.png
}}}
runs fine, producing the expected 1x70 PNG image, whereas
{{{
ffmpeg -report -f lavfi -i color -vf crop=1:70 -vframes 1 -y slice.png
}}}
as mentioned in the initial report fails with an error. Inspecting the
logs reveals that the second variant leads to the auto-insertion of an
auto_scaler_0 into the filtergraph, which is not the case in the first
variant. Just after that, Parsed_crop_0 reports its configuration as
"[Parsed_crop_0 @ 0x55d8e481f540] w:320 h:240 sar:1/1 -> w:0 h:70 sar:1/1"
(see log attached with original message) and produces a fatal error, while
the corresponding line in the output of the testsrc variant above reads
"[Parsed_crop_0 @ 0x55dea412be00] w:320 h:240 sar:1/1 -> w:1 h:70
sar:1/1". Small but essential difference...
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7818#comment:2>
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