[FFmpeg-devel] Suggested Patch for timecode timebase calculation in mov.c

Clément Bœsch u at pkh.me
Sat Jan 24 11:35:20 CET 2015

On Fri, Jan 23, 2015 at 06:44:56AM -0800, jon wrote:
> Hi Michael,
> That is great!
> I see what you are referring to in mov_read_timecode_track(). However the
> text of that comment seems contradictory to me based on what I have read in
> the QuickTime reference I sited about the tmcd counter flag.
> It seemed like prior to the patch I submitted mov_parse_stsd_data() was
> collecting the st->codec->time_base as if the counter flag was unset.
> That comment text comes from commit:
> 35da85562d2f731855b28d4ab3b9b0679730ebf7
> Perhaps Clément Bœsch has a better understanding of the difference between
> timecode values when the counter flag is set and when it is not. My work was
> based on deciphering the samples I had at my disposal in conjunction with my
> interpretation of the reference pdf.

From what I remember, all the samples I had were in "frame number format"
even though the flag was not set. I haven't look at this stuff for a very
long time though.


Clément B.
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