Video converteren met FFmpeg

Oplossing

- Installeer FFMPEG -

#sudo apt-get install ffmpeg

- Informatie over een VIDEO bestand opvragen -

#ffmpeg -i mijnvideo.avi

- Exporteer elk frame naar een JPEG van een video -

#ffmpeg -i video.avi afbeelding%d.jpg

If you want to try this, work inside a specific folder or you'll fill your home with thousands of jpeg.

- Video maken van een serie JPEG bestanden -

ffmpeg -f afbeelding2 -i afbeelding03d.jpg mijnvideo.mpg

Note the parameter imagepercent03d.jpg. You must type in terminal % and not percent [I must use this trick beacuse editor misunderstand the combination %zerosometing]. This one works on files named "image001.jpg", "image002.jpg", "image999.jpg". You can adjust it to your need. For example %d is good for images named image1.jpg, image2.jpg, etc. Jpeg are the most common type, but you can work with every kind of bitmap file.

The command is really useful if you're working on a stopmotion video and want a quick test. We can do more, setting fps and bitrate this way.

ffmpeg -r 24 -b 1800 -i image%d.jpg myvideo.mpg

-r 24 means "24 frames per second" and -b 1800 means "video bitrate at 1800 kb/s".

- TO EXTRACT THE AUDIO TRACK FROM A VIDEO AND SAVE IT MP3 -

ffmpeg -i myvideo.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 myaudio.mp3

This means:

Original video: myvideo.avi
Sampling frequency: 44100 Hz
Audio bitrate: 192 kb / s
Output Format: mp3
Audio generated: myaudio.mp3

The quick&dirty version is:

ffmpeg -i myvideo.avi myaudio.mp3

- TO CONVERT A VIDEO FROM FORMAT A TO FORMAT B -

ffmpeg -i originalvideo.avi convertedvideo.mpg

Here we are converting an AVI file into an MPEG one [quick&dirty mode = ON].

- TO QUICK CONVERT A VIDEO TO iPhone -

This is good for 4:3 videos.

ffmpeg -i originalvideo.avi -s 480x320 -aspect 4:3 -b 768k -ab 64k -ar 22050 -r 30000/1001 convertedvideo.mp4

Change -aspect 4:3 to -aspect 16:9 if you are working on a 16:9 video.

- TO CONVERT A VIDEO TO iPad -

When the going gets tough, the toughs get going! Don't fear, just sneak where the files names are and the -aspect parameter.

ffmpeg -y -i originalvideo.avi -acodec aac -ar 48000 -ab 128k -ac 2 -s 1024×768 -vcodec libx264 -b 1200k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 1200k -maxrate 1200k -bufsize 1200k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 16:9 -r 30 -g 90 -async 2 convertedvideo.mp4

- TO QUICK CONVERT A VIDEO TO WEBM -

ffmpeg -i originalvideo.avi convertedvideo.webm

WebM is an audio-video format designed to provide a royalty-free, open video compression format for use with HTML5 video. The project's development is sponsored by Google.

- TO CAPTURE SCREEN AND MIC -

ffmpeg -f alsa -itsoffset 00:00:02.000 -ac 2 -i hw:0,0 -f x11grab -s $(xwininfo -root | grep 'geometry' | awk '{print $2;}') -r 10 -i :0.0 -sameq -f mp4 -s wvga -y mydesktopmovie.mp4

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