[mythtv] Mythtv mpeg frame counting - patch?

[Yeechang Lee]

Bill <level42 at sympatico.ca> says:
> What am I missing for this problem?  I checked the repeat_pic field in 
> AVFrame (I think it is); this is not the problem.  It is almost as if the 
> actual frame rate is 24, or the frame rate is not constant or for DVB 
> broadcast they are playing some other tricks to save bandwidth. 

Some observations that may help you to fix this issue:

* On my cable system, I see the discrepancy with both HD premium-movie
  channels (HBO, Cinemax, etc.). One hour equals about 5GB and the OSD
  reports about 51-52 minutes. Advertisements and other non-filmed
  material's elapsed times appear correct. See
  <URL:http://svn.mythtv.org/trac/ticket/1941>.
* I see the discrepancy with non-HD, non-premium but digital cable
  (SoapNET, for example, which is channel 130) channels. One hour
  equals about 1.4GB and the OSD reports about 51 minutes.
* The discrepancy does not exist with non-HD, analog cable channels
  (TCM, for example, which is channel 51). One hour equals about
  2.8-2.9GB.
* The discrepancy does not exist with HDNet Movies and HDNet, which
  are HD channels that advertise their unusually high-bandwidth
  feeds. One hour equals to about 7.5GB +-0.3GB.
* The discrepancy exists to some degree with other HD channels such as
  National Geographic and Discovery HD Theater. This is very
  program-specific, however; the discrepancy for the recent miniseries
  _Planet Earth_, for example, is only 15-30 seconds, while the
  longtime staple _Sunrise Earth_ used to carry no discrepancy but now
  typically carries a two or three-minute discrepancy even on older
  episodes that used to carry no discrepancy. One hour equals to about
  7.5GB +-0.3GB.
* The discrepancy does not exist with most San Francisco Bay area OTA
  and cable HD network affiliates' HD channels. One hour equals to
  about 7.5GB +-0.3GB.
* The discrepancy has existed for the past year or so with the local
  NBC affiliate's OTA and cable HD channel. One hour equals to about
  7.5GB +-0.3GB and the OSD reports about 52 minutes for filmed
  material. See
  <URL:http://www.gossamer-threads.com/lists/mythtv/users/227272#227272>. However,
  videotaped material (like Jay Leno) does not carry the discrepancy,
  or if it does is only for 15-30 seconds.

-- 
Yeechang Lee <ylee at pobox.com> | +1 650 776 7763 | San Francisco CA US