Hey Patrick, When rendering to .webm, kdenlive passes
acodec=vorbis to melt. Here's an example $ /usr/bin/melt /tmp/saved.mlt in=0 out=63 -profile atsc_1080p_25 -consumer avformat:/home/kingsley/tmp/test.webm f=webm vcodec=libvpx acodec=vorbis crf=23 vb=0 quality=good aq=6 max-intra-rate=1000 cpu-used=4 threads=1 real_time=-1 But, it crashes with a seg fault. ffmpeg's audio codec documentation says to use libvorbis[1]. libvorbis works for me. $ /usr/bin/melt /tmp/saved.mlt in=0 out=63 -profile atsc_1080p_25 -consumer avformat:/home/kingsley/tmp/test.webm f=webm vcodec=libvpx acodec=libvorbis crf=23 vb=0 quality=good aq=6 max-intra-rate=1000 cpu-used=4 threads=1 real_time=-1 rendered OK. Could kdenlive be passing a bad option to melt (and ffmpeg/libav*)? Thanks, Kingsley [1] FFmpeg Codecs Documentation https://ffmpeg.org/ffmpeg-codecs.html#libvorbis -- Time is the fire in which we all burn.