Thanks for quick answer. I solved it here by installing a dozen or so of Wheezy-testing packages on Squeeze. So I can finally enjoy WebM ! ==== Actually if 'core' FFmpeg was modular - this problem would have much easier solution: Just provide 'libavcodec-webm', and we're done. Sadly FFmpeg is a one indivisible thing, without plug-ins (with separate package per-codec). -- -Alexey Eromenko "Technologov"