[FFmpeg-user] Get video duration programmatically for encoding

[killkenny64]

Hi,

I'm trying to figure out the duration of a video that I have decoded so that
I can encode it correctly.

I noticed some fields in AVFormatContext and AVStream that seem to be useful
however I can't seem to make heads nor tails of the values I'm getting.

If I look at inputFormatCtx->streams[videoStream]->duration, the value seems
to change every time I run my program. I get values like 1220560, 505248,
1333280 etc.

inputFormatCtx->streams[videoStream]->time_base is always 1, so I'm not sure
how I can use it to calculate the duration.

inputFormatCtx->duration at least stays the same each time I run my program
but I get the value of 1336792 so I'm unsure how to use this value.

I know that I can use the frame rate and the total number of frames to
calculate the duration, but I dont know the total number of frames until
I've iterated through them all.

Any help would be much appreciated, thanks! =)

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