I've been trying to use the Record function to edit video files, only recording the part I want.
This has worked well in many cases, but WEBM files are converted to AVI format and the sound is lost.
This problem may be related to another topic: viewtopic.php?f=14&t=99375&p=334297
The difference is that the source in this case is not a URL but a file already on my hard disk.
This ticket may also be relevant, but maybe needs to be edited to reflect this broader problem:
http://trac.videolan.org/vlc/ticket/6493