ff_get_format: fix infinite loop

Signed-off-by: Anton Khirnov <anton@khirnov.net>
sdp: Simplify parsing/conversion of H264 extradata

By using ff_avc_write_annexb_extradata instead of the h264_mp4toannexb
BSF, the code for doing the conversion itself is kept much shorter,
there's less state to restore at the end, we don't risk leaving the
AVCodecContext in an inconsistent state if returning early due to
errors, etc.

Also add a missing free if the base64 encoding fails.

Signed-off-by: Martin Storsjö <martin@martin.st>
lavf: Set the stream time base hint properly for chained muxers

This avoids warnings about using the codec time base as time
base hint.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit '153fadc390d05aa47e5e2c56290401898fe41a23'

* commit '153fadc390d05aa47e5e2c56290401898fe41a23':
  ff_get_format: fix infinite loop

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'b76249443864c88ffb2d41ab8d1de7432e985dc7'

* commit 'b76249443864c88ffb2d41ab8d1de7432e985dc7':
  sdp: Simplify parsing/conversion of H264 extradata

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '28816050e47b6dba430a52e429d21a864cffda8e'

* commit '28816050e47b6dba430a52e429d21a864cffda8e':
  lavf: Set the stream time base hint properly for chained muxers

Conflicts:
	libavformat/segment.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/mxfdec: read reel_name and source timecode from physical source package

Reviewed-by: Tomas Härdin <tomas.hardin@codemill.se>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/avpacket: simplify freeing pkt->data

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/avpacket: use av_freep(), do not leave stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/proresenc_kostya: use av_freep(), do not leave stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/escape124: use av_freep(), do not leave stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/hls: use av_freep(), do not leave stale pointers in memory

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>