On Wed, Jul 21, 2021 at 8:30 PM Jan Ekström <jee...@gmail.com> wrote: > > On Wed, Jul 21, 2021 at 8:28 PM Jan Ekström <jee...@gmail.com> wrote: > > > > Seems to be: > > * Utilized by Handbrake for track titling > > * Actually defined as "title for the media" > > > > Definition from 3GPP TS 26.244 follows: > > > > Field Type Details > > Value > > BoxHeader.Size Unsigned int(32) > > BOX_SIZE > > BoxHeader.Type Unsigned int(32) > > 'titl' > > BoxHeader.Version Unsigned int(8) > > 0 > > BoxHeader.Flags Bit(24) > > 0 > > Pad Bit(1) > > 0 > > Language Unsigned int(5)[3] Packed ISO-639-2/T language code > > Title String Text of title > > > > Semantics: > > > > Language: declares the language code for the following text. See > > ISO 639-2/T for the set of three character codes. Each character > > is packed as the difference between its ASCII value and 0x60. > > > > The code is confined to being three lower-case letters, so these > > values are strictly positive. > > > > Title: null-terminated string in either UTF-8 or UTF-16 characters, > > giving a title information. If UTF-16 is used, the string shall > > start with the BYTE ORDER MARK (0xFEFF). > > --- > > A sample for this sort of metadata can be seen with > https://0x0.st/-zjq.m4v , which was posted at > https://github.com/mpv-player/mpv/issues/8488 . > > The sample contains both "name" and "titl" boxes: > [udta: User Data Box] > position = 3991500 > size = 71 > [name] > position = 3991508 > size = 28 > [titl] > position = 3991536 > size = 35 > > ...out of which if I read QTFF documentation correctly "name" should > not be utilized for user-facing naming, and "titl" is actually a > user-facing metadata box. Thus I implemented the latter. > > Jan
Ping. Includes a link to a testable file, and the specification of the box is in the commit message :) Jan _______________________________________________ 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".
