avconv command lines to reduce video size

avconv_examples.sh

# https://trac.ffmpeg.org/wiki/Encode/H.264
# https://trac.ffmpeg.org/wiki/Encode/AAC

# -map 0 -c copy: copy all remaining streams
# -pix_fmt yuv420p: be compatible with most players

# high quality video, high quality audio
avconv -i input.mov -map 0 -c copy -c:v libx264 -preset veryslow -pix_fmt yuv420p -crf 17 -c:a libfdk_aac -vbr 4 output.mov

# high quality *compatible* full-hd video, high quality audio
avconv -i input.mov -map 0 -c copy -c:v libx264 -preset veryslow -pix_fmt yuv420p -refs 4 -crf 17 -c:a libfdk_aac -vbr 4 output.mov

# medium-high quality video, high quality audio
avconv -i input.mov -map 0 -c copy -c:v libx264 -preset veryslow -pix_fmt yuv420p -crf 22 -c:a libfdk_aac -vbr 4 output.mov

# medium quality video, medium-high quality audio
avconv -i input.mkv -vcodec libx264 -s hd1080 -crf 27 -acodec ac3 output.mp4

# high quality video (resize to hd)
avconv -i input.mov -map 0 -c copy -c:v libx264 -preset veryslow -pix_fmt yuv420p -s 1280x720 -crf 17 output.mov