On Fri, 26 Apr 2019 00:40:30 +0200, Moritz Barsnick <[email protected]>
wrote:
On Thu, Apr 25, 2019 at 15:38:22 -0400, Mark McKay wrote:
I'm using the C++ API
To my knowledge, ffmpeg has no C++ API - apart from the fact that a C
API, which it has, is compatible with C++. (Sorry for being petty.)
Furthermore, for questions regarding the use of the ffmpeg-libav*
APIs,
please refer to the mailing list "libav-user":
https://ffmpeg.org/mailman/listinfo/libav-user
I'd like to be able to load a video and determine how many seconds
long it is. I thought I would be able to calculate this time by
looking at AVFormatContext->duration in the header and that
[...]
However, if I scan through all my packets to the end, my final
packet
has a presentation time of 3580928 and my codec context has a
timebase of 1 / 50.
The length of a video as indicated in its header and its actual
length
can differ. There's nothing much you can do about this, except to
demux
/ decode a file to its end to check for the actual timestamps (and
possible discontinuities).
On this mailing list, we can show you how to use the ffmpeg command
line tool to
expose this difference.
Cheers,
Moritz
Thanks. For the record, it turned out I was using the format's
time_base instead of the stream's time_base. In the future I'll post to
the libav list.
Mark
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