[FFmpeg-trac] #5072(undetermined:new): Weird filter error: Not connected to any destination

[FFmpeg]

#5072: Weird filter error: Not connected to any destination
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             Reporter:               |                    Owner:
  michael.heuberger                  |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by michael.heuberger):

 Okay, pulled the latest FFmpeg and compiled with all the other codec:

 Here is the uncut console output:

 {{{
 $ ffmpeg -r 15.251101979467286 -f image2 -thread_queue_size 64 -i
 ./frames/%d.webp -i ./videomail_preview.wav -y -acodec aac -strict
 experimental -ar -1 -ac 1 -vcodec libx264 -vf
 "scale=trunc(iw/2)*2:trunc(ih/2)*2" -crf 16 -preset fast -profile:v
 baseline -pix_fmt yuv420p -loglevel warning -movflags faststart
 ./videomail_good.mp4 -acodec libvorbis -ar -1 -ac 1 -vcodec libvpx -vf
 "scale=trunc(iw/2)*2:trunc(ih/2)*2" -crf 8 -deadline good -cpu-used 1
 -pix_fmt yuv420p -loglevel warning -movflags faststart
 ./videomail_good.webm
 [wav @ 0x31d2800] Estimating duration from bitrate, this may be inaccurate
 Guessed Channel Layout for  Input Stream #1.0 : mono
 [audio format for output stream 0:1 @ 0x322b840] Error parsing sample
 rate: -1.
 Output pad "default" with type audio of the filter instance
 "Parsed_anull_0" of anull not connected to any destination
 Error opening filters!
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5072#comment:5>
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