HANDY TIP: Concatenating ffmpeg encodes
You can easily concatenate (chain together) several FFmpeg commands to produce multiple sequential encodes in one command line. You can also join video files in this way.
Example parallel use:
ffmpeg -i fluid8.mov -y out1.mp4 && ffmpeg -i fluid8.mov -y out2.avi && ffmpeg -i fluid8.mov -y out3.flv && ffmpeg -i fluid8.mov -y out4.mov
The same input file is being encoded to several different formats.
Example chained use:
ffmpeg -i fluid8.mov -y out1.mp4 && ffmpeg -i out1.mp4 -y out2.avi && ffmpeg -i out2.avi -y out3.flv && ffmpeg -i out3.flv -y out4.mov
The output of the first command is being used as the input for the second command and so on.
ffmpeg -i episode1.mov -sameq -y tmp1.mpg && ffmpeg -i episode2.mov -sameq -y tmp2.mpg && cat tmp1.mpg tmp2.mpg > tmp3.mpg && ffmpeg -i tmp3.mpg -vcodec libx264 -vpre hq -b 1500k -y joined.mp4
By using the -sameq command as well as the mpg format, you are ensuring an absolute minimum loss of quality. mpg has to be used as it's raw codec streams can easily be joined into a valid movie file by *nix with the cat command. This high quality intermediate is then encoded to a format or size of your choice, 1.5 m/bit x264 in this case.
(The two movies are the same size and frame rate in this example. There is no audio in this example.)
Experiment with different combinations and settings to make life easier. I can post some examples with audio if desired.
Take it easy.
"half-way to world domination A.K.A. the belligerent blue bike shed"