[FFmpeg-devel] [PATCH 4/4] avformat/concatdec: always re-calculate start time and duration

[Nicolas George]

Marton Balint (2018-12-09):
> Seeking will only work in the special case I provided in the commit message,
> when we always seek back to the beginning and otherwise read the referenced
> files continously.
> 
> In theory, when we are in "seekable" state then if we detect a duration
> change we could indeed update all subsequent start times to provide proper
> timestamps for seeking, but I did not need this for my purpose, and I am not
> sure if it's worth the extra code needed.

I am really not comfortable with leaving the loaded gun of the seekable
flag if it does not work reliably. I think at the very least the code
should detect a file change, emit a warning and invalidate all
subsequent durations.

Note that if all you are interested in is seeking to the beginning of
the virtual file, it can always work. I would not object to a special
case in the seek code for that.

Regards,

-- 
  Nicolas George
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