On 06/10/2011 05:58 PM, Philipp wrote: > Hi, > sorry for abusing this list for a mostly video editing question, but I > didn't find a proper list and knew that we have some video people on > this list. > > I'd like to fix some videos that have partially out of sync video and > audio, meaning that beginning at a certain point in the video the audio > is suddenly out of sync by a couple of seconds. There's no constant > change, the delay seems fixed once it's there. > > I wonder how to fix such a thing. The files are xvid encoded videos and > vbr mp3 audio inside avi containers. I thought it should be reasonably > easy to cut and move the audio (re-encode if unavoidable, but I know > it's in principle possible without) and put it back in a container, but > I didn't manage. > > Can someone recommend a program/workflow that would allow this? > > I tried: > - Avidemux: seems like actual editing is not what this program was > written for, couldn't figure it out, but it seems close > > - openshot: couldn't figure out how to separate video/audio > > - kino: seems to only work with DV-files, apparently takes ages to > decode the file, doesn't seem to be what I need > > - openmovieeditor: I figured it might work by dragging the file to both > a video and an audio track, but I got extremely garbled audio output, > no idea what's wrong > > - cinelerra-cv: Doesn't start. No error message, it simply shows no > window, nothing. Well, it does something with the screen, but it shows > nothing. > > - pitivi: Doesn't seem like it can play back the video. I can drag the > video to the tracks and it starts to draw a waveform, I guess no video > thumbnails because of: gst.ElementNotFoundError: pngenc > Doesn't seem to be able to play the video. > > - kdenlive: would require me to install 30 additional packages, total > about 200MB, no thanks. > > I thought it would be a simple task, really nothing fancy. Seems like I > was wrong. If you're just interested to do it once during playback: with mplayer you can set A/V offset (using '+' and '-' and 'o' for on-screen-display). IIRC VLC can do it as well... If you're up to compiling A3 + videotimeline: it's intended for this kind of work: http://rg42.org/wiki/a3vtl - basically it does the following (but with a nice GUI); 1) separate A/V ffmpeg -i INPUT.avi -vn audio.wav; ffmpeg -i INPUT.avi -an -sameq video.avi 2) re-align A/V (by shifting/cutting the audio) You could do this step with xjadeo & ardour2 3) Mux A/V ffmpeg -i video -i audio.wav -vcodec copy -sameq output.avi The A3-vtl video-export offers a lot more ffmpeg encoding options optimizations.. but the above command should do; see `man ffmpeg` or `ffmpeg --help` - though reading those is only for the faint-hearted. google is your friend. Sorry short reply. I'm a bit tied up this week-end and mostly offline. HTH, robin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
