[FFmpeg-trac] #9184(avfilter:open): pngdec output frame that has double image

FFmpeg trac at avcodec.org
Mon Jul 26 13:01:05 EEST 2021

#9184: pngdec output frame that has double image
             Reporter:  akoryagin    |                    Owner:  (none)
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  artefact on  |               Blocked By:
  the video                          |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
Comment (by Pljushevij):

 Replying to [comment:19 wenbin,chen]:
 > {{{
 > ffmpeg -init_hw_device vaapi=va -filter_hw_device va -hwaccel vaapi
 -hwaccel_output_format vaapi -i 1080P_THE_HOBIT3_1920x1080_2700frames.264
 -c:v h264_vaapi -b:v 3M -maxrate 3M -c:a copy -y -movflags +faststart
 > }}}
 > Hi Pljushevij. Here is the command for vaapi. There is no "shortest"
 option so you need to set "loop" for movie. And overlay_vaapi seems
 doesn't process alpha channel, so you need to set "alpha" option for
 overlay_vaapi. And somehow the command cannot work on "sailboat.ts" but
 can work on other video. Please use qsv as vaapi only have limited
 Hello. Thank you for you answer, but this command show error: No such
 filter: 'overlay_vaapi'
Ticket URL: <https://trac.ffmpeg.org/ticket/9184#comment:20>
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