[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
             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           |

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>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

More information about the FFmpeg-trac mailing list