Re: (no subject)
Steve Lhomme <[email protected]>
| Newsgroups | gmane.comp.multimedia.matroska.devel |
|---|---|
| Message-ID | <CAOXsMF+V9J_q9y91CxME_Gd+f=6M=qkDMfR48yQKAn051AyrLQ@mail.gmail.com> |
On Wed, Mar 4, 2015 at 6:14 PM, Frank Galligan <[email protected]> wrote: > Hi Steve, > > Long time. > > Anyway, The altref frames need to have a 0 duration, but we don't need the > 0 duration in a Block to have it signal that the altref is a non keyframe. > We are perfectly fine having the altref frame setting the ReferenceBlock if > it refers to another frame, signaling that the altref frame is a non > keyframe. > > I just don't want muxers writing P frames with a duration of 0 to signal > non keyframe. > Why is this a problem ? > Thanks, > Frank > > > On Sun, Mar 1, 2015 at 11:57 PM, Steve Lhomme <[email protected]> > wrote: > >> On 28/02/2015 03:39, Chris Cunningham wrote: >> >>> + Steve, author of this addition. >>> >> >> Hi everyone, >> >> The change was made following this discussion to handle alt-ref frames in >> VP8 at the container level. >> >> https://groups.google.com/a/webmproject.org/forum/?hl=en#! >> searchin/webm-discuss/Supported$20container$20elements/webm-discuss/ >> 9PuJWrpjE1c/76zzUjRmqpgJ >> >> On Fri, Feb 27, 2015 at 6:27 PM Chris Cunningham >>> <[email protected] <mailto:[email protected]>> wrote: >>> >>> Hey Matroska! >>> >>> First, let me apologize if I'm asking an answered question. The >>> mailing list search function is a bad link >>> <http://lists.matroska.org/swish/swish.cgi>. >>> >>> I work on Chromium Media and we've seen a little confusion from >>> content creators around a line that was added >>> <https://github.com/Matroska-Org/foundation-source/commit/ >>> d3931e8f58898b9d673661fd7221b4704ffc917b> >>> to the Matroska spec >>> <http://www.matroska.org/technical/specs/index.html> for >>> BlockDuration (and whether it should be used in WebM): >>> >>> "When set to 0 that means the frame is not a keyframe." >>> >>> Just curious about the history/motivations for this. WebM's >>> container guidelines don't mention this and AFAIK WebM (de)muxers >>> just use ReferenceBlocks ... is there an edge-case where that >>> doesn't work out? >>> >>> Thanks, >>> Chris >>> >>> >> > -- Steve Lhomme Matroska association Chairman _______________________________________________ Matroska-devel mailing list [email protected] http://lists.matroska.org/cgi-bin/mailman/listinfo/matroska-devel Read Matroska-Devel on GMane: http://dir.gmane.org/gmane.comp.multimedia.matroska.devel