Nasty problem with testing ppa Kdenlive + ffmpeg

[Harald Albrecht]

Hi,

there seems to be some really nasty problem with the current testing 
ppa: I've seeing crashes in ffmpeg when thumbnails are to be generated 
or when switching to the clip monitor. Anyone else experiencing these 
issues?

#0  0x00007fffd12c65f2 in ?? () from 
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#1  0x00007fffd0de45a5 in ?? () from 
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#2  0x00007fffd0dfe201 in ?? () from 
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#3  0x00007fffd0e02ce7 in ?? () from 
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#4  0x00007fffd0daf5e9 in ?? () from 
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#5  0x00007fffd1135686 in avcodec_decode_video2 () from 
/usr/lib/x86_64-linux-gnu/libavcodec-ffmpeg.so.56
#6  0x00007fffd08bfe38 in ?? () from 
/usr/lib/x86_64-linux-gnu/libavformat-ffmpeg.so.56
#7  0x00007fffd08c93ba in avformat_find_stream_info () from 
/usr/lib/x86_64-linux-gnu/libavformat-ffmpeg.so.56
#8  0x00007fff9d1aff27 in ?? () from 
/usr/lib/x86_64-linux-gnu/qt5/plugins/kf5/kfilemetadata/kfilemetadata_ffmpegextractor.so
#9  0x00000000008ae651 in ClipPropertiesController::fillProperties() ()
#10 0x00000000008a7205 in 
ClipPropertiesController::ClipPropertiesController(Timecode, 
ClipController*, QWidget*) ()
#11 0x00000000008fadfc in ProjectClip::buildProperties(QWidget*) ()
#12 0x00000000008dc7c7 in Bin::showClipProperties(ProjectClip*, bool) ()
#13 0x00000000008d984b in Bin::selectProxyModel(QModelIndex const&) ()

Best regards,
Harald