H264-ROI
(H264 Region Of Interest) Encoder

h264-roi written by Charlie Waters
Programs used and linked libraries are copyright of their respective owners

h264-roi Build Dependencies:
libavformat
libavcodec
libavdevice
libavutil
libswscale
libswresample
libx264
libz
libmp3lame (sometimes the linker demands this, depending on avconfig.h config)

roi.sh Run Dependencies:
ffmpeg
libx264
libmp3lame

Ubuntu Packages:
$ sudo apt-get install libssl-dev libsqlite3-dev libavcodec-dev libswscale-dev libavformat-dev libavdevice-dev ffmpeg libx264-dev libmp3lame-dev

Specifically, ffmpeg must be built with support for libx264 and libmp3lame. This goes something like:
$ git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg
$ cd ffmpeg
$ ./configure --enable-gpl --enable-libx264 --enable-libmp3lame
$ make
# make install

h264-roi Building:
$ git clone --recursive <h264-roi git url> h264-roi
$ mkdir h264-roi-build
$ cd h264-roi-build
$ cmake ../h264-roi
$ make

h264-roi Usage:
$ h264_roi <input_file> <output_file> -q <base_qp> [region] [...]
Where:
input_file = A planar (YUV) H264 video file (NO OTHER CHANNELS, THIS IS WHAT roi.sh IS FOR)
output_file = Where to write a planar (YUV420P) H264 video file
base_qp = Quantizer value from 0 to 51, where 0 is lossless, 51 is no longer video. This "compression factor" is applied to the entire frame.
region = A rectengle to specify a different quantizer value for. Edges are rouned to the macroblock (16x16 pixels). See below for format.

Region Format:
First specify two corners of a rectangle, then the desired quantization factor of the pixel inside the rectangle.
<first_corner_x>,<first_corner_y>,<second_corner_x>,<second_corner_y>:<quantizer_value>
Example: Leave the pixels in the rectangle with opposite corners (100,100) and (500,400) uncompressed: 100,100,500,400:0

roi.sh Usage:
$ sh roi.sh <input_file> <output_file> -q <base_qp> [region] [...]
Where:
input_file = A video file with audio
output_file = Where to write an MP4 file with H264 video and MP3 audio
base_qp = Same as above
region = Same as above

Exmaples:
(in build directory)

Re-Encode lol.avi (1920x1080) as lol.control.5.mp4 with base qp of 5, no regions of interest:
$ bash roi.sh "lol.avi" "lol.control.5.mp4" -q 5

Re-Encode lol.avi (1920x1080) as lol.roi.mp4 with base qp of 20 and qp of 5 in specified regions of interest:
$ bash roi.sh "lol.avi" "lol.roi.mp4" -q 20 0,125,102,681:5 0,828,324,1080:5 1810,118,1920,689:5 1608,766,1920,1080:5 572,839,1352,1080:5