On Fri, Sep 21, 2018 at 3:19 PM Maxim Ershtein <mersht...@gmail.com> wrote: > > Hello, > > ffmpeg allows capturing a/v from custom DirectShow source filters, and > provides some methods to pass parameters to these filters, but these > methods seem insufficient. > > So ffmpeg offers to launch a filter configuration dialog via > -show_video_device_dialog > , however, it doesn't work on some filters, but most importantly, it is not > a programmatic way; you need to have a user configuring the filter. > > I wrote an issue report yesterday to ffmpeg-users: > http://www.ffmpeg-archive.org/Cannot-receive-audio-video-from-Unreal-WebRTC-DirectShow-Source-filter-td4685353.html > > The principal problem is with network capture filters that must be > initialized with URL or some network address, in order for them to get the > stream and construct a media type on the output pins. > They don't have any output media type once instantiated - they must be > initialized in order to have a media type. Depending on network address > where they pull a stream from, this media type can be very different. > > So a feature suggestion is to use a common COM interface used in DirectShow > for this purpose: > IFileSourceFilter. Notice how GraphEdit pops up an open file dialog > prompting you to load a configuration file, when you try to add source > filter that supports this interface. > > So, ffmpeg can have a command-line parameter, like > *-IFileSourceFilter_Init_String.* > If this parameter is passed, AND source filter supports IFileSourceFilter, > then ffmpeg calls IFileSourceFilter::Load with that parameter. > > Any other idea of how to programmatically pass *custom* parameters to > source filters, > is welcomed.
Yeah I attempted to research it once and didn't get very far https://stackoverflow.com/questions/14050074/how-to-change-directshow-filter-properties-c/27931102#27931102 If IFileSourceFilter is common then that's a legit option... _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
