cubicweb-mediaplayer #12266731 encoding an audio file with an invalid embeded png image fails [validation pending]

since ffmpeg try to embed the image in the converted file:

root@sd-88636:/var/www/serendib.io# ffmpeg  -y -i 263117_data_Tilge\,\ Höchster\,\ meine\ Sünden\,\ \[BWV\  1083\]NLMkmZ  -f mp3 -acodec libmp3lame -ab 123k /tmp/out.mp3
ffmpeg version 2.8.6-1~bpo8+1 Copyright (c) 2000-2016 the FFmpeg developers
 built with gcc 4.9.2 (Debian 4.9.2-10)
 configuration: --prefix=/usr --extra-version='1~bpo8+1' --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr /lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --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-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
 libavutil      54. 31.100 / 54. 31.100
 libavcodec     56. 60.100 / 56. 60.100
 libavformat    56. 40.101 / 56. 40.101
 libavdevice    56.  4.100 / 56.  4.100
 libavfilter     5. 40.101 /  5. 40.101
 libavresample   2.  1.  0 /  2.  1.  0
 libswscale      3.  1.101 /  3.  1.101
 libswresample   1.  2.101 /  1.  2.101
 libpostproc    53.  3.100 / 53.  3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7160e0] stream 0, timescale not set
[png @ 0x719360] Invalid PNG signature 0xFFD8FFE1212A4578.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7160e0] decoding for stream 1 failed
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7160e0] Could not find codec parameters for stream 1 (Video: png, none(pc)):  unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '263117_data_Tilge, Höchster, meine Sünden, [BWV 1083]NLMkmZ':
 Metadata:
   major_brand     : M4A
   minor_version   : 0
   compatible_brands: M4A mp42isom
   creation_time   : 2031-03-23 02:37:00
   iTunSMPB        :  00000000 00000840 00000194 00000000002C022C 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
   iTunNORM        :  000001B3 000001E9 00000B26 00000CDA 00001D06 0000D0FB 0000352A 00002DDA 00001D06 0000D0FB
   title           : 31 Pergolesi/Bach - 14. Amen (CD Tempéraments - Radio France)
   artist          : M. Frimmer, A. Markert, Le Parlement de Musique, Martin Gester
   album_artist    : Le Parlement de Musique, Martin Gester
   composer        : Bach, J.S.
   album           : Bach - Tilge, Höchster, meine Sünden TEMPERAMENTS
   grouping        : Sampler
   genre           : Classical
   track           : 15/22
   disc            : 1/1
   date            : 2000
   compilation     : 0
   account_id      : martin.gester@mac.com
   media_type      : 1
   sort_album_artist: Parlement de Musique, Martin Gester
 Duration: 00:01:05.46, start: 0.000000, bitrate: 418 kb/s
   Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 249 kb/s (default)
   Metadata:
     creation_time   : 2031-03-23 02:37:00
   Stream #0:1: Video: png, none(pc), 90k tbr, 90k tbn, 90k tbc
[buffer @ 0x73fa40] Unable to parse option value "0x0" as image size
[buffer @ 0x73fa40] Unable to parse option value "-1" as pixel format
[buffer @ 0x73fa40] Unable to parse option value "0x0" as image size
[buffer @ 0x73fa40] Error setting option video_size to value 0x0.
[graph 0 input from stream 0:1 @ 0x742440] Error applying options to the filter.
Error opening filters!
prioritynormal
typebug
done in0.2.1
load left0.000
closed by#2dcb0609e382 [media] do not import image/video stream in encoded audio media (closes #12266731)
patch[media] do not import image/video stream in encoded audio media (closes #12266731) [applied]