Next I thought I would try to (initially) put them into mkv containers, but I ended up with this: flv files that I want to combine into one file.įirst of all, I tried putting them together in avidemux, but the sound is out of sync by the end (all of the files play perfectly by themselves). Posted: Sun 9:16 pm Post subject: basic video editing So the best thing to do is: demux your V and your A to separate streams, fix your V, then accordingly fix your A (using separate tools) and then remux them together again.Gentoo Forums :: View topic - basic video editing Some of them are more processor intensive in order to avoid non-musical artifacts. That is often not possible with general-purpose apps, but with audio-specific apps there are a number of pitch-correcting duration/tempo change options. While there might be some apps that do BOTH kinds of speedup/slowdown, the better tools work specifically with one media type or the other (A or V).įor example, with audio, most people prefer that when speeding up/slowing down that the pitch remain the same. Changing video's FPS changes its duration, so you'd have to change audio's duration the same percentage as was done to the video to keep it in sync with the video. Too much and you have silly "chipmunk" voices.įor them to maintain sync, they have to start at the same time and keep the same duration. A similar thing happens with audio: if you speed up the audio, the pitch & tempo changes. Too much and you have silly "keystone cops" type of motion. If you speed up the video, the rate of motion changes. Multi-channel/multi-track audio is fairly common, while multi-track video is relatively rare (stereo 3d most common exception). Audio is (usually) sample-accurate, while Video is frame-accurate. While multimedia containers may make it look to average users that V+A are combined, they are different beasts with different requirements.
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