timestamps in flv are 32bits _signed_ according to flash player, specs are wrong
timestamps in flv are 32bits _signed_ according to flash player, specs are wrong

git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@15045 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg