[Cin] Very slow opening of one specific mp4 file

[Phyllis Smith]

Andrew, here is the result of analysis:

But attempt at editing  this file with Cin-GG (from July 1 2019 + ffmpeg
> git) resulted in Cin process
> eating  a lot of CPU and only showing and playing first minute or so.
>
> Using the attached script, gg was able to verify that the bandicam...mp4
file has only a single keyframe and to quote from previous information
-- "Generally
it just does not have keyframes which are needed for seeking which is what
is done when you move around the media and start playing in the middle".
Except in this case it already hangs using 1 thread to build the index
because of no keyframes.

Bottom line is that Cinelerra will never be able to handle this file.  He
is going to add a message to the code to at least notify the user so as to
not hang leading to frustration.
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