How to generate a 2hour-long blank video
For an h264 output in a MP4 container, use:
ffmpeg -t 7200 -f lavfi -i color=c=black:s=640x480 -c:v libx264 -tune stillimage -pix_fmt yuv420p output.mp4
If you want to include an audio track, simply add the arguments for the audio input and encoding (if necessary). The output's duration will be determined by the shortest input, i.e. the audio. For example:
ffmpeg -f lavfi -i color=c=black:s=640x480 -i audio.ogg -c:v libx264 -tune stillimage -pix_fmt yuv420p -shortest -c:a aac -b:a 128k output-with-audio.mp4
You can use ffmpeg for this:
ffmpeg -t 7200 -s 640x480 -f rawvideo -pix_fmt rgb24 -r 25 -i /dev/zero empty.mpeg
UPDATE:
-t: length of the video (in H:m:s format 00:00:00 or in seconds 0.000)
-s: frame size
-f: video format
-pix_fmt: pixel format
-r: fps
-i: input