[FFmpeg-trac] #9999(ffmpeg:new): Failure to create webm manifest for single key-frame video

[FFmpeg]

#9999: Failure to create webm manifest for single key-frame video
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             Reporter:  jlenart  |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  ffmpeg   |                  Version:  unspecified
             Keywords:  webm     |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 Summary of the bug:

 I have encountered a possible bug in ffmpeg 5.1.2 (also tested on 5.1). In
 the event an output video has only a single key-frame, attempting to
 generate the DASH manifest will fail, resulting in the error message:

 Error parsing Cues
 output.webm: Invalid data found when processing input


 If multiple key-frames are present, (in the reproduction steps replace -to
 5 with -to 6, given an input video longer than 6), the manifest is created
 without issue.

 How to reproduce:
 {{{

 $ ffmpeg -y -i <input_video> -c:v libvpx-vp9 -an -to 5 -f webm -dash 1
 output.webm
 $ ffmpeg -y -f webm_dash_manifest -i output.webm -c copy -map 0 -f
 webm_dash_manifest -adaptation_sets "id=0,streams=0" result.mpd

 ffmpeg version: 5.1.2 (and 5.1)
 libvpx version: 1.12

 }}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/9999>
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