Core dumped when using ffmpeg2theora on m4v video

ffmpeg2theora 0.29

 Xiph.Org libtheora 1.1 20090822 (Thusnelda)
 Xiph.Org libVorbis 1.3.5
 FFmpeg libavcodec 57.48.101
 FFmpeg libavformat 57.41.100

valgrind ffmpeg2theora VIDEO.m4v -o VIDEO.ogv -x 640 -y 360 --videoquality 5 --audioquality 0 --frontend
==4142== Memcheck, a memory error detector
==4142== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==4142== Using Valgrind-3.12.0.SVN and LibVEX; rerun with -h for copyright info
==4142== Command: VIDEO.m4v -o VIDEO.ogv -x 640 -y 360 --videoquality 5 --audioquality 0 --frontend
==4142==
==4142== Invalid write of size 8
==4142== at 0x7C76899: av_samples_fill_arrays (in /usr/lib/x86_64-linux-gnu/libavutil.so.55.28.100)
==4142== by 0x7C76BB8: av_samples_alloc (in /usr/lib/x86_64-linux-gnu/libavutil.so.55.28.100)
==4142== by 0x40ECC1: ??? (in /usr/bin/ffmpeg2theora)
==4142== by 0x40542E: main (in /usr/bin/ffmpeg2theora)
==4142== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==4142==
==4142==
==4142== Process terminating with default action of signal 11 (SIGSEGV)
==4142== Access not within mapped region at address 0x0
==4142== at 0x7C76899: av_samples_fill_arrays (in /usr/lib/x86_64-linux-gnu/libavutil.so.55.28.100)
==4142== by 0x7C76BB8: av_samples_alloc (in /usr/lib/x86_64-linux-gnu/libavutil.so.55.28.100)
==4142== by 0x40ECC1: ??? (in /usr/bin/ffmpeg2theora)
==4142== by 0x40542E: main (in /usr/bin/ffmpeg2theora)
==4142== If you believe this happened as a result of a stack
==4142== overflow in your program's main thread (unlikely but
==4142== possible), you can try to increase the size of the
==4142== main thread stack using the --main-stacksize= flag.
==4142== The main thread stack size used in this run was 8388608.
==4142==
==4142== HEAP SUMMARY:
==4142== in use at exit: 2,955,775 bytes in 2,333 blocks
==4142== total heap usage: 4,328 allocs, 1,995 frees, 21,257,942 bytes allocated
==4142==
==4142== LEAK SUMMARY:
==4142== definitely lost: 0 bytes in 0 blocks
==4142== indirectly lost: 0 bytes in 0 blocks
==4142== possibly lost: 895 bytes in 8 blocks
==4142== still reachable: 2,954,880 bytes in 2,325 blocks
==4142== suppressed: 0 bytes in 0 blocks
==4142== Rerun with --leak-check=full to see details of leaked memory
==4142==
==4142== For counts of detected and suppressed errors, rerun with: -v
==4142== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Erreur de segmentation