I need just increase sound of my MTS video. But I'm very afraid to lose the quality of video because it is classical music and intonation is very important.
1 Answer
The setup that i use for something similar is:
Step 1 - demux
avconv -i in.mts -an -c:a copy video.mkv -c:a copy audio.ac3
Step 2 - audio editing
For this i just open my audio.ac3 in Audacity and normalise the sound. At this time it may be a good idea to try to remove the noise. I reencode into Vorbis, but it is up to you what you wish to do. Let's say you save into audio.oga
Step 3 - mux
avconv -i video.mkv -i audio.oga -c:v copy -c:a copy out.mkv
Notes
- Video was getting copied all the time. So no quality loss is possible from that.
- You can drop the video demuxing, and just grab it directly from the original in the third step. But i find it just makes the process much cleaner when you know where everything is.