Massimo Battistel <battistel <at> gmail.com> writes: > ffmpeg -i sample.mp4 -vn -acodec pcm_s16le -ac 2 > -async 1000 -f asf - > nul Why are you adding -async 1000 ? Unrelated: --enable-zlib and --enable-bzlib do not what you think they do, please remove them. Carl Eugen