On Fri, Sep 27, 2019 at 04:14:33PM +0100, Derek Buitenhuis wrote: > On 27/09/2019 15:37, Matthieu Bouron wrote: > > Allows the creation of the sdtp atom while remuxing MP4 to MP4. This > > atom is required by Apple devices (iPhone, Apple TV) in order to accept > > 2160p medias. > > Can you point to a document about this (for informational purposes)?
For the MP4 container, tt is part of ISO/IEC14496-12 but it looks like it is not public. It is also described here for the QT container: https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-SW46 The specification differs in wording and presentation between the two, but the final encoded values of each flags are the same. For both specs the flags are stored in 1 byte. For sample_is_depended_on in QT, you have to use: kQTSampleDependency_NoOtherSampleDependsOnThisSample = 1<<3, kQTSampleDependency_OtherSamplesDependOnThisSample = 1<<2, In MP4, the spec describe the following layout for the flags: unsigned int(2) reserved = 0; unsigned int(2) sample_depends_on; unsigned int(2) sample_is_depended_on; unsigned int(2) sample_has_redundancy; unsigned int(2) And values for sample_is_depended_on: 0: the dependency of other samples on this sample is unknown 1: other samples depend on this one (not disposable) 2: no other sample depends on this one (disposable) 3: reserved NOTE: we already support the sdtp atom in movenc.c. > > Is this valid for both QTFF and ISOBMFF? > > > static void mov_update_dts_shift(MOVStreamContext *sc, int duration) > > { > > if (duration < 0) { > > @@ -6767,6 +6801,7 @@ static const MOVParseTableEntry > > mov_default_parse_table[] = { > > { MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */ > > { MKTAG('s','t','t','s'), mov_read_stts }, > > { MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */ > > +{ MKTAG('s','d','t','p'), mov_read_sdtp }, /* independant and disposable > > samples */ > > Spelling mistake. Fixed locally. Thanks. -- Matthieu B. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
