On Mon, Mar 30, 2015 at 11:28:29AM +0100, Kieran Kunhya wrote: > On 30 March 2015 at 11:24, madshi <mad...@gmail.com> wrote: > > 2015-03-30 12:10 GMT+02:00 Kieran Kunhya <kier...@obe.tv>: > >> We should have DRC enabled in AAC and other codecs > >> if it's considered a normative part of the spec. > > > > So basically you do what the spec says regardless of whether it makes sense > > or not? > > Yes,
for FFmpeg, this is not true. ISO mpeg4 specified one way to do QPEL, but the reference implementation did it the other way. Our decoder tries hard to figure out which of the 2 was used on the encoder side and matches it when decoding. IIRC the mpeg4 spec was changed to match the implementation at some point then as well Some mpeg4 encoders do the edge handling for MC wrong, we detect them and match it in the decoder. That way the user sees a nice video instead of one with minor or not so minor artifacts. We clearly violate a normative part of the spec by displaying these videos without artifacts we also detect some ancient buggy version of x264 and decode that different from what the spec would require to match what the encoder did, the above examples are of course bug workarounds but then there is no spec that says "output video with a modified gamma compared to the encoder input unless the user override that" or does one ? [...] > and we let power users change things from the API - I don't see > why that's so hard. > > Kieran > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be, because of the obscurity of the subject, and the brevity of human life -- Protagoras
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