[FFmpeg-trac] #4298(avfilter:open): zoompan filter creates shaky image
FFmpeg
trac at avcodec.org
Mon Jul 1 08:24:27 EEST 2019
#4298: zoompan filter creates shaky image
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Reporter: slhck | Owner:
Type: defect | Status: open
Priority: normal | Component: avfilter
Version: git-master | Resolution:
Keywords: zoompan | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by jdlh):
Replying to [comment:4 slhck]:
> Inserting the scale filter before (as Carl-Eugen suggested) with video
magically makes the output 720p, without me requesting that.
>
> {{{
> ffmpeg -i test.mp4 -vf "scale=640:360,
zoompan=z='min(zoom+0.0015,1.5)':d=125" out.mp4
> [... omitted for brevity ...]
> }}}
The 720p output is expected. Note that [http://ffmpeg.org/ffmpeg-
all.html#zoompan the '''zoompan''' filter defaults to an output image size
of hd720], unless the invocation asks for a different size by means of the
`s` option. For a proper test, this command should be revised to
{{{ffmpeg -i test.mp4 -vf "scale=640:360,
zoompan=z='min(zoom+0.0015,1.5)':d=125:s=640x360" out.mp4}}}
One of the example zoompan filter invocations in the documentation
demonstrates setting the output size this way.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/4298#comment:9>
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