#2686: Native AAC encoder collapses at high bitrates on some samples -------------------------------------+------------------------------------- Reporter: Kamedo2 | Owner: Type: defect | Status: open Priority: normal | Component: avcodec Version: git-master | Resolution: Keywords: aac | Blocked By: regression | Reproduced by developer: 1 Blocking: | Analyzed by developer: 0 | -------------------------------------+-------------------------------------
Comment (by klaussfreire): No, it's not the loudest bin. It's a group of bins. Because the sine isn't represented on the mdct by a single bin, but rather a ripple pattern that has to be accurately encoded, or the resulting sine fluctuates in amplitude (hence the clipping). But I got a solution. I'm doing the listening tests now, but it sounds good. Basically, a two-front approach: lower the volume of near-clipping windows (and only those, to make it idempotent), and tweak tonal band priorization (because the sine wave was getting too few bits after all). -- Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:243> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker _______________________________________________ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac