I have a 20-min video that my friend has recently recorded, but the whole thing occupies 1 G. Is there a way to reduce it to something that can be emailed to people without completely using the quality?
Terminal commands (Which by default are not installed) are:
Install it by
sudo apt-get install mencoder
The part about mencoder that you want is the parameter -vop scale which tells mencoder to what scale you want the video to go to. This is normal if you want to reduce bandwidth use, lower video size, etc..
mencoder input.mp4 -ovc lavc -lavcopts vcodec=mp4 -vop scale=640:480 -oac copy -o output.mp4
mencoder input.mp4 -ovc lavc -lavcopts vcodec=mp4 -vf scale=640:480 -oac copy -o output.mp4
or a simple
mencoder input.mp4 -vop scale=640:480 -o output.mp4
Although from my experience is better to include additional information for video and audio like the one above.
Install it by
sudo apt-get install ffmpeg
Here is an example of ffmpeg:
ffmpeg -i input -vf scale=iw/2:-1 output
Where IW = Video Input Width.
Scale = Parameter to scale to. In this case you are dividing the original size by 2 (iw/2)
both of which can provide more information if you either execute them without parameters or variables like just
ffmpeg or type for example
man mencoder or
man ffmpeg which will give you a VERY extensive little manual on how to work with them.
AVCONV <-- I love this guy!
To Install -
sudo apt-get install libav-tools
To Run -
avconv -i input.mp4 -s 640x480 output.mp4
-i is for the original input file,
-s is for the size for each frame and the name of the output final goes in the end.
GUI tools which I love are:
AVIDEMUX - It can resize and lower the size which helps in cases where the objective is to lower size. avidemux
HANDBRAKE - Excellent tool for converting videos and optimizing size. I use it a lot when going from ogg to mp4 with h.264. Lowers A LOT the size. handbrake
So in conclusion, for direct resizing/scaling you can use the terminal ones. For size you can use all.
Generally for such tasks, you could try Handbrake
HandBrake is a tool for converting video from nearly any format to a selection of modern, widely supported codecs
It should be in the repositories.
sudo apt-get install handbrake
Though 1GB ---> something that can be send by e-mail, sounds rather (read extremely) optimistic.