On Mon, 2 Mar 2020, Tomas Härdin wrote:
fre 2020-02-28 klockan 10:30 +0100 skrev Marton Balint:On Fri, 28 Feb 2020, Carl Eugen Hoyos wrote: > Am Fr., 28. Feb. 2020 um 01:38 Uhr schrieb Marton Balint <c...@passwd.hu>: > > Fixes ticket #8523.> > > > Signed-off-by: Marton Balint <c...@passwd.hu>> > --- > > libavformat/mxf.c | 13 +++++++++++++ > > 1 file changed, 13 insertions(+)> > > > diff --git a/libavformat/mxf.c b/libavformat/mxf.c> > index 14056647c5..987410258a 100644 > > --- a/libavformat/mxf.c > > +++ b/libavformat/mxf.c > > @@ -135,10 +135,23 @@ static const MXFContentPackageRate mxf_content_package_rates[] = { > > { 2, { 1, 24 } }, > > { 3, { 1001, 24000 } }, > > { 4, { 1, 25 } }, > > + { 6, { 1, 30 } }, > > { 7, { 1001, 30000 } }, > > + { 8, { 1 , 48 } }, > > + { 9, { 1001, 48000 } }, > > { 10, { 1, 50 } }, > > { 12, { 1, 60 } }, > > { 13, { 1001, 60000 } }, > > + { 14, { 1, 72 } }, > > + { 15, { 1001, 72000 } }, > > + { 16, { 1, 75 } }, > > + { 18, { 1, 90 } }, > > + { 19, { 1001, 90000 } }, > > + { 20, { 1, 96 } }, > > + { 21, { 1001, 96000 } }, > > + { 22, { 1, 100 } }, > > + { 24, { 1, 120 } }, > > + { 25, { 1001, 120000} },> > Are these still the only supported frame rates?These are the *package* rates that SMPTE 326M defines (technically it defines the /1.001 version of 25, 50, 75 and 100 fps, but those are not used).For the record, this is section 7.2 Content package rate in SMPTE 326M- 2000. What is not initially obvious is that mxf_content_package_rates-rate is bits b5..b0. A comment about this would be nice, I don't likemagical tables in the MXF codebase not being justified by references :) You could technically have 25/1.001, 50/1.001, 75/1.001 and 100/1.001 too. But it's probably wise not to do that.
I am not sure, maybe we should add all possible values, even if they are uncommon. After all I found out that for example 50/1.001 is actually supported for mkvmerge:
https://gitlab.com/mbunkus/mkvtoolnix/-/commit/1a350a9573e4f895223e7ab10f7d491440abaf62 Regards, Marton
> How do archivists store low-fps film in mxf?I don't know. One can write an undefined package rate into the file, or the frame rate can may be different from package rate. You can put almost anything into MXF, the only problem is that it will not be widely supported or readable.Like Marton says, MXF allows anything. In practice everyone uses a small set of profiles of MXF. No one attempts to support all of MXF, that way lies madness. /Tomas _______________________________________________ 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".
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