On 8/5/2020 9:52 AM, Tom Burrows via ffmpeg-user wrote:
I need to get the duration of any video file such that when multiplied
with the media's fps value (in this case, either ’tbr’ or ‘fps'), it
equals the number of frames in the video.
That works until you find a variable frame-rate video. I have found that to
get a truly accurate duration or frame-count, you have to effectively render
the entire file, even if to /dev/null. It does take (much) longer, but it's
not really a re-encode, just a copy.
A prime example of this is an mp2 pulled out of a dvd vob- I've seen a lot
of cases where the metadata info is wildly wrong* or that parts of the video
change between 24 fps and 29.97, there's also the 3:2 pulldown flag....
*duration 00:46:13 on a 90 minute movie? I think not.
AFAICT, no video tool has solved this without running the entire stream. You
might take one approach for fixed-rate containers/encodings and another for
variable-rate.
Later,
z!
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