Problematic code path:
1. sps_buffers[0] is allocated in the first thread's codec context when the
decoder is opened.
2. The first thread context is memcpy'd to the other threads by frame_thread_init().
3. The first thread is closed and its sps_buffers[0] is freed.
4. The third thread is closed.
Because it never got to decode a frame, update_thread_context was never called,
and sps_buffers[0] still contained the first thread's pointer.

Fixed by not trying to free sps/pps buffers if the thread wasn't initialized.
I didn't properly consider this when designing it but this seems to be the
best approach anyway.

Fixes still2.mp4 crash from Chromium

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Patch by Nick Brereton, nick nbrereton net 


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connection (e.g. a seek). This fixes the theoretical case where a server
sends a file first using chunked encoding, and then using non-chunked
encoding.



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them from being sent using chunked encoding (I don't think this ever happened,
but either way it would be wrong).



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It is already rejected by the "source >= 0 && source != ps->num_env" 0 envelope
case and is perfectly legally for the suppressed final envelope case.


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leading cross_prefix in it. Fixes cross-compilation for darwin.


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r23646.


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E-AC-3 (61937-3 Edition 2) and TrueHD (61937-9).


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Document ONLY_IF_THREADS_ENABLED along the way.

Conflicts:
	libavutil/internal.h

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This fixes a potential issue when doing redirects.


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This removes some useless copying of handles, and simplifies error handling.

Patch by Josh Allmann, joshua dot allmann at gmail


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function pointer. Should allow for ASM optimizations.


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Fixes issue2015


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 It allows VLD MPEG-2 decoding using DXVA2 (GPU assisted decoding API under
VISTA and Windows 7).
 It is implemented by using AVHWAccel API.



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Since rtsp_hd isn't assigned to rt->rtsp_hd until after the setup phase,
the initialized URLContext could be leaked on failures.


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Earlier, the function only returned when the enough data to fill the
requested buffer was available. This lead to high latency when receiving
low-bandwidth streams.


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Data-burst is described in IEC 61937-7 (Atrac) and IEC 61937-8 (WMA Pro).


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warning #188: enumerated type mixed with another type
      enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
                                      ^


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