#2686: Native AAC encoder collapses at high bitrates on some samples -------------------------------------+------------------------------------- Reporter: Kamedo2 | Owner: Type: defect | klaussfreire Priority: normal | Status: open Version: git-master | Component: avcodec Keywords: aac | Resolution: regression | Blocked By: Blocking: | Reproduced by developer: 1 Analyzed by developer: 0 | -------------------------------------+-------------------------------------
Comment (by klaussfreire): Well, time for an update... I did some tests, and faad's problem is with correlated PNS bands (PNS + ms_mask). It seems to be applying the M/S transform even though the specs clearly state that when PNS is used in conjunction with ms_mask bits, it should not. I'd consider that a faad bug, but we are indeed producing "weird" bitstreams (we signal correlated PNS when only one side uses PNS, which makes the ms_mask unnecessary). Avoiding that weirdness works around faad's bug (and avoids possibly triggering similar bugs in other decoders). I'm working on that patch now (thoroughly testing now). -- Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:473> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker _______________________________________________ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://ffmpeg.org/mailman/listinfo/ffmpeg-trac