RTMP: fix FD leak in rtmp_open()

If we setup AVIO interrupt callback and it will be returns 1 on socket
timeouts and we try to connect to non-existing streams on some servers
(like nginx-rtmp) we got FD leak.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/h264_mp4toannexb_bsf: add a case when only SPS/PPS is in the stream.

When only SPS or PPS is present in the stream, copy the missing one from
AVCC before insertion to the output stream.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/h264_mp4toannexb_bsf: use the given padding in h264_extradata_to_annexb().

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Kill timed SRT
avcodec/srtdec: use AVBPrint API
avcodec/bitstream_filter: Use av_bitstream_filter_next() instead of direct access in av_bitstream_filter_init()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/flvenc: When using "-c:d copy", don't require a codec for passing the AMF metadata through from input to output.