Fix handling of streams without PTS values in every frame

[peter.alm@…]

The current handling of streams without pts values in every frame is broken, frames without a stored pts value will have a temppts value of 0, not below 0 which the current check looks for.

Another problem with the current implementation is that it uses time_base when interpolating the pts value, on the channels I have seen that does not set the pts value, the time_base value is not a 1:1 mapping to the frame rate (50fps vs a time_base of 90,000) so this patch changes this behaviour to use curstream->r_frame_rate instead.

[anonymous]

Forgot to set a few fields:

Version should be 0.22-fixes Component should be MythTV - Video Playback

[tralph]

Peter, please provide a short sample which demonstrates your problem. You can use something like dd if=video.mpg of=video_small.mpg bs=1024 count=50000 to generate a 50MB file and upload to filebin.ca.

[peter.alm@…]

Here's a sample: ​http://filebin.ca/kayper/sample.mpg

[tralph]

(In [23612]) Correct the video timestamp fixup code by making the following changes:

• Perform fixup when PTS is not available which is indicated by temppts == 0.

• Calculate temppts using fps instead of context->time_base. The prior calculation was actually wrong since it also needed to be multiplied by context->ticks_per_frame. Using fps also allows us to be consistent with normalized_fps().

This commit is a slight modification of the provided patch.

Thanks to Peter Alm for the patch and sample.

Fixes #7961.