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Set DSCP value after the remote address has been set (this is needed for DSCP to be set correctly on Windows).

Fixing bug which was preventing libv4l2 from being really disabled when using the option --disable-libv4l2.

Make the VideoToolbox decoder sends the MS_DECODER_DECODING_ERRORS notification when it fails to decode a frame

CMSampleBufferCreateReady is only available after MacOSX 10.10

That must be done since VideoToolbox filters are registered at runtime
when the platform support them

That filter must be added at runtime when the VideoToolbox API is present on the system

When the application is put into background on iOS, the VideoToolbox session
is boken. That resulted in the VideoToolbox filter was not able to decode
any frame once the application has been resumed.

That fix destroys the decoding context when the -12903 status code
is returned by the VTDecompressionSessionDecodeFrame function.
Then, the decompression session will be created again when a new frame
is recieved.

This reverts commit 0dc0a702.