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

[FFmpeg]

#5072: Weird filter error: Not connected to any destination
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------

Comment (by michael.heuberger):

 Sure. First download and extract the attached test files into another
 directory on your machine.

 Then, reproduce this (the command in one line and its 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 @ 0xb12320] Estimating duration from bitrate, this may be inaccurate
 Guessed Channel Layout for  Input Stream #1.0 : mono
 [audio format for output stream 0:1 @ 0xaea3e0] 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!
 }}}

 and here again the ffmpeg version:

 {{{
 $ ffmpeg -version
 ffmpeg version 2.7.3-0ubuntu0.15.10.1 Copyright (c) 2000-2015 the FFmpeg
 developers
 built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
 configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-
 suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
 --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared
 --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r
 --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray
 --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite
 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
 libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-
 libopenjpeg --enable-openal --enable-libopus --enable-libpulse --enable-
 librtmp --enable-libschroedinger --enable-libshine --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx
 --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi
 --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883
 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264
 --enable-libopencv --enable-libx265
 libavutil      54. 27.100 / 54. 27.100
 libavcodec     56. 41.100 / 56. 41.100
 libavformat    56. 36.100 / 56. 36.100
 libavdevice    56.  4.100 / 56.  4.100
 libavfilter     5. 16.101 /  5. 16.101
 libavresample   2.  1.  0 /  2.  1.  0
 libswscale      3.  1.101 /  3.  1.101
 libswresample   1.  2.100 /  1.  2.100
 libpostproc    53.  3.100 / 53.  3.100
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5072#comment:2>
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