I run Avidemux 2.5.6 in Debian Testing amd64 and I usually have random errors when opening a video. They are something like this:
Assert failed :rewind
at line 247, file /tmp/buildd/avidemux-2.5.6/avidemux/ADM_editor/ADM_edRender.cppADM_backTrack
ADM_Composer::getUncompressedFrame(unsigned int, ADMImage*, unsigned int*)
AVDMVideoStreamNull::getFrameNumberNoAlloc(unsigned int, unsigned int*, ADMImage*, unsigned int*)
externalEncoder::encode(unsigned int, ADMBitstream*)
GenericAviSaveProcess::setupVideo(char*)
GenericAviSave::saveAvi(char const*)
A_Save(char const*)
A_SaveWrapper(char*)
FileSel_ReadWrite(void (*)(char const*), int, char const*, char const*)
avidemux2_gtk() [0x529c0c]
HandleAction(Action)
g_signal_emit_valist
g_signal_emit_by_name
g_signal_emit_valist
g_signal_emit
g_signal_emit_valist