[FFmpeg-trac] #4298(avfilter:open): zoompan filter creates shaky image

FFmpeg trac at avcodec.org
Mon Jul 1 08:16:38 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):

 I suspect there were some errors copying and pasting the original "how to
 reproduce" command and output. It reads,

  ffmpeg -framerate 25 -loop 1 -i in.jpg -vf
 "zoompan=z='min(zoom+0.0015,1.4)':x=50:d=150" -t 6 -s 640x380 out.mp4
 ffmpeg version N-69568-g21051af Copyright (c) 2000-2015 the FFmpeg
 [... omitted for brevity ...]
 Input #0, image2, from 'out.jpg':
   Duration: 00:00:00.04, start: 0.000000, bitrate: 3236 kb/s
     Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
 640x360, 25 fps, 25 tbr, 25 tbn, 25 tbc
 [... omitted for brevity ...]
 Output #0, mp4, to 'out.mp4':
     encoder         : Lavf56.19.100
     Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021),
 yuvj420p(pc), 640x360, q=-1--1, 25 fps, 12800 tbn, 25 tbc
 [... omitted for brevity ...]

 First, the command line has the output size setting `-s 640x380`, but the
 command output says "output #0" has size 640x360, as does also the
 supplied "out.mp4" file. 380 is different than 360. Second, the command
 line specifies an input file named `in.jpg`, but the command output says
 the input is read `from 'out.jpg'`. "in.jpg" is not "out.jpg". If there
 are mistakes here, are there mistakes elsewhere?

Ticket URL: <https://trac.ffmpeg.org/ticket/4298#comment:8>
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