This exemplary initial setup uses two devices /dev/sdb and /dev/sdc but can be applied to any amount of devices by following the steps with additional devices.
Create keyfile:
dd bs=64 count=1 if=/dev/urandom of=/etc/cryptkey iflag=fullblock
chmod 600 /etc/cryptkey
Transcoding FLAC music to Opus:
ffmpeg is a highly useful application for converting music and videos. However, audio transcoding is limited to a a single core. If you have a large FLAC archive and you wanted to compress it into the efficient Opus codec, it would take forever with the fastest processor to complete, unless you were to take advantage of all cores in your CPU.
parallel 'ffmpeg -v 0 -i "{}" -c:a libopus -b:a 128k "{.}.opus"' ::: $(find -type f -name '*.flac')
Transcoding Videos to VP9:
| # Instrument binaries, pgo data to /data/pgo, serial make is important to not confuse the pgo generator | |
| env CXXFLAGS='-march=native -fprofile-dir=/data/pgo -fprofile-generate=/data/pgo' cmake .. -DCMAKE_BUILD_TYPE=Release | |
| make -j 1 | |
| # Run instrumented program, generate and write pgo data | |
| ./runIt | |
| # Use profile data and feed into gcc, correct for threading counter noise, serial make is important to not confuse the pgo generator | |
| env CXXFLAGS='-march=native -fprofile-dir=/data/pgo -fprofile-use=/data/pgo -fprofile-correction' cmake .. -DCMAKE_BUILD_TYPE=Release | |
| make -j 1 |
| /* | |
| * Simple sound playback using ALSA API and libasound. | |
| * | |
| * Compile: | |
| * $ cc -o play sound_playback.c -lasound | |
| * | |
| * Usage: | |
| * $ ./play <sample_rate> <channels> <seconds> < <file> | |
| * | |
| * Examples: |
| This is gist. | |
| There are many like it, but this one is mine. | |
| It is my life. | |
| I must master it as I must master my life. | |
| Without me gist is useless. | |
| Without gist, I am useless. |
