Here are my notes I used for the presentation:
getting ffmpeg on Fedora20 I needed rpmfusion…
sudo yum install rpmfusion-free-release-20.noarch.rpm sudo yum install rpmfusion-nonfree-release-20.noarch.rpm
sudo yum install ffmpeg
yum install openshot Take the audio out of the video:
ffmpeg -i eviction.mp4 -vcodec copy -an eviction_vo.mp4
-i input_file -vcodec = set the video codec -an = disable audio recording
copy 2 seconds of the video starting at time 38seconds.
ffmpeg -i eviction_vo.mp4 -ss 00:00:38 -t 00:00:02 escape.mp4
-ss = position -t = duration
copy the first 38 seconds:
ffmpeg -i eviction_vo.mp4 -ss 00:00:00 -t 00:00:38 first_part.mp4
copy the last 10 seconds:
ffmpeg -i eviction_vo.mp4 -ss 00:00:40 -t 00:00:10 last_part.mp4
slow down the interesting part by 1/2
ffmpeg -i escape.mp4 -vf "setpts=(1/.5)*PTS" slower.mp4
now put them back together!
Create a file with the parts in it (preferably in order!)
file first_part.mp4 file slower.mp4 file last_part.mp4
ffmpeg -f concat -i list.txt -c copy whole_thing.mp4
-f = video format (usually auto-detected and not needed, but here it's needed) -c copy = indicates that the stream is no to be re-encoded.
ffmpeg -i grill.3gpp grill.wav ffmpeg -i bye.amr bye.wav
import them into the project along with any other audio of interest.
create title/intro and credits/outro pages.
save and export the video!
For composing music (writing sheet music) use Rosegarden! Rosegarden has many tools that need to be installed and properly configured in order to get sound to work! (that will probably be my next presentation)
For recording music (guitar / voice /instuments) use Audacity! setup clicktrack, then percussion track, then voicetrack