Common abbreviations/shorthands we use that don't need a comment
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dsp: digital signal processing
dst/adst: (asymmetric) discrete sine transform
ec: entropy coding or error concealment
er: error resilience
fdct/idct: forward/inverse discrete cosine transform
fft: fast Fourier transform
gop: group of pictures
hw/sw: hardware/software
lp: lowpass
lpf: loop filter
lut: lookup table
mb: macroblock
mc: motion compensation
me: motion estimation
mv: motion vector
nal: network abstraction layer
pel/qpel/epel/hpel/fpel: pixel / quarter-pixel / eighth-pixel / half-pixel / full-pixel
pp: post process
qp: quantization parameter
rc: rate control
sei: supplemental enhancement information
sl: slice
vlc: variable length coding
vq: vector quantization