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The anchor I mean

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These anchor mean's frame change, like op, ed etc. Can used to skip op, but how can I read these frame time by ffmpeg or from metadata ?

wener
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    In case you want to get the "progress", you may take a look at [my answer](https://stackoverflow.com/a/67409107/4926757). The anchor is probably the PTS timestamps (in some cases there is a frame number, and in some containers like MKV the average frame rate is in the metadata). The conventional way for getting the PTS is using the C interface of FFmpeg (LibAV). Here is a nice [tutorial](https://github.com/leandromoreira/ffmpeg-libav-tutorial). – Rotem Apr 15 '22 at 08:28

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