Hi On Mon, Feb 05, 2018 at 04:48:44PM -0500, bmat...@gmail.com wrote: > Added a new expr/function get(n, filename) in libavutil/eval.c that is meant > to > be used in conjunction with the select filter and greatly enhances the > generality of the select filter. > > The select filter as it exists now can be used to selectively enable frames > during transcoding. e.g.: select='not(mod(n\,100))' will enable one frame > every > 100. > > It is often required to do much more complex frame by frame selection under > the > control of an external program. For example, a face detector might indicate > frames on which certain individuals have been detected and we wish to get a > video with only frames where those individuals are present. Another example is > video of lab experiments synchronized with some external sensor and we wish to > extract the frames where the sensor detected some event. > > The get operator may be used as follows: > -vf 'select=get(n\,"frame_select.en")'
no, this is not secure if you want to pass data from a file to a expression this has to be done in a way different from the eval code taking a filename from its expression string. also data should be taken as 64bit double precission floats not bytes [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Avoid a single point of failure, be that a person or equipment.
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