FFMPEG's built-in logging and warning level can be read and set with
Set FFMPEG log level. Options are:
loglevel() -> String
Get FFMPEG log level as a variable name string.
Each ffmpeg library has its own VideoIO subpackage:
libavcodec -> AVCodecs libavdevice -> AVDevice libavfilter -> AVFilters libavformat -> AVFormat libavutil -> AVUtil libswscale -> SWScale
The following three files are related to ffmpeg, but currently not exposed:
libswresample -> SWResample libpostproc -> PostProc (not wrapped)
After importing VideoIO, you can import and use any of the subpackages directly
import VideoIO import SWResample # SWResample functions are now available
Note that much of the functionality of these subpackages is not enabled by default, to avoid long compilation times as they load. To control what is loaded, each library version has a file which imports that's modules files. For example, ffmpeg's libswscale-v2 files are loaded by VideoIO_PKG_DIR/src/ffmpeg/SWScale/v2/LIBSWSCALE.jl.
Check these files to enable any needed functionality that isn't already enabled. Note that you'll probably need to do this for each version of the package for ffmpeg, and that the interfaces do change some from version to version.
Note that, in general, the low-level functions are not very fun to use, so it is good to focus initially on enabling a nice, higher-level function for these interfaces.