[FFmpeg-trac] #8887(undetermined:new): Weird vertical stripes

[FFmpeg]

#8887: Weird vertical stripes
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  michael.heuberger                  |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Looks like a bug. Any ideas why ffmpeg encoded like this? See attached
 image.

 Trying to generate two videos in one go (MP4 and WebM) based on image
 frames with this long command:

 {{{
 ffmpeg -f image2 -thread_queue_size 4096 -framerate 20.0
 -i ./frames/%d.webp -y -an
 -vcodec libx264
 -filter:v
 scale=trunc(iw/2)*2:trunc(ih/2)*2,hflip,drawtext=fontfile=./fonts/Varela-
 Regular.ttf:text=test-
 video:fontsize=14:fontcolor=0xFFFFFF at 0.6:x=text_h/1.5:y=main_h-(text_h*2):shadowcolor=0x111111 at 0.6:shadowx=1:shadowy=1
 -crf 18 -pix_fmt yuv420p -preset medium -profile:v baseline
 -level:v 3.1 -movflags +faststart ./video_good.mp4
 -vcodec libvpx
 -filter:v scale=trunc(iw/2)*2:trunc(ih/2)*2,hflip,drawtext=fontfile
 =./Varela-Regular.ttf:text=test-
 video:fontsize=14:fontcolor=0xFFFFFF at 0.6:x=text_h/1.5:y=main_h-(text_h*2):shadowcolor=0x111111 at 0.6:shadowx=1:shadowy=1
 -crf 4 -pix_fmt yuv420p -deadline good -cpu-used 1
 -loglevel warning ./video_good.webm
 }}}

 Does it look like a bug? I cannot always reproduce it and only seems to
 happen from some images generated from some webcam models of my visitors.

 Not sure, could be something else. Thanks.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8887>
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