Le quintidi 5 ventôse, an CCXX, Deron a écrit : > Taking Nicolas George's suggestion, I have created a basic > libavdevice for Blackmagic's DeckLink HD-SDI cards. I'm thrilled to > have it working to any degree (much easier than I expected), but > still have several issues to work out. Where is the proper place to > ask questions for a new libavdevice? ffmpeg-dev or here or ?
I believe ffmpeg-devel is the best place. > The most important is that the normal use of the device will be to > output a specific frame size/fps and the audio is _always_ 48k s16le > 2, 8 or 16 channels. > > The issues I'm not sure about are: > > 1) Automatically converting audio to 48k, s16le, 2/4/8 channels. > > 2) Automatically scale/crop video to output. The usual way is not to convert anything: if the provided data is not in the required format, fail with a clear error message and let the user (or the application) fix it the way they see fit: $ ffmpeg -f s16le -ar 47000 -i /dev/zero -f alsa hw:1 ... [alsa @ 0x1c84de0] cannot set channel count to 1 (Invalid argument) [alsa @ 0x1c84de0] sample rate 47000 not available, nearest is 48000 > 3) Proper configure detection of installed DeckLink includes. The configure script has plenty of support, this should be easy. Regards, -- Nicolas George
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