avformat: Provide a standard compliance flag

Provide f_strict for avconv usage.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
nut: Support experimental NUT 4 features

Add the low overhead pipe mode and the extended broadcast mode.
Export the options as 'syncponts' since it impacts only that.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
avresample: Add avresample_get_out_samples

Utility function to get the upper bound on the number of samples the
resampler would output.
af_resample: Use avresample_get_out_samples