An automatic schedule was set to download the images archived at Kochi University on the hourly basis using cron and wget. The satellite images, which are in JPEG format, are checked and stored onto HPCL storage keeping exactly the same directory tree structure as the original archive. Each day, 24 images are downloaded and stored. The images are then put together into MPEG animation. This process went through a few steps.
In the nutshell, the JPEG image is transformed into portable pixmap (PPM) format with the desired size. This PPM file is then transformed again into raw YUV and then with other images, are combined into MPEG animation with the MPEG compression/decompression software.
- djpeg
- ppmtoyuvsplit
- mpeg tool from Stanford University (MPEGv1.2.2.tar.gz)