[FFmpeg-trac] #1051(avdevice:new): ffmpeg with -f lavfi and movie leads to error messages and videos with 1 fps

[FFmpeg]

#1051: ffmpeg with -f lavfi and movie leads to error messages and videos with 1
fps
------------------------------------+------------------------------------
             Reporter:  ls          |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avdevice
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by ls):

 There seems to be a problem with framerate estimation and lavfi.

 Working:
 {{{
 $ ffplay -f lavfi movie=camera-raw.mp4,scale=-1:968
 [...]
 Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1721x968 [SAR
 15488:15489 DAR 16:9], 25 tbr, 25k tbn, 25k tbc
 }}}

 Only 1 fps:
 {{{
 $ ffplay -f lavfi movie=camera-raw.mp4,scale=-1:969
 [...]
 Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1723x969 [SAR
 5168:5169 DAR 16:9], 1 tbr, 25k tbn, 25k tbc
 }}}

 A small change in frame height changes the framerate estimated to 1 fps.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1051#comment:1>
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