Hi, 2015-10-13 13:10 GMT+02:00 Michael Niedermayer <mich...@niedermayer.cc>: > hmm, iam a bit concerned that adding the rounder (which effectively is > 0.5) causes a overflow, that would if iam not mistaken imlpy that > things are very close to overflowing already without it
It's true, but the immediate cause here is the input coeffs overflowing (ie, once the rounder is added, a positive value is seen as a negative one to pmaddwd). Otherwise, your concern is basically whether 32bits arithmetics is enough: then simple_idct may also overflows on x86_32. -- Christophe _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
