doc/APIchanges: fill in missing hashes and dates
lavf: add AVFormatContext.max_ts_probe

It allows to configure how long will avformat_find_stream_info() wait
to get the first timestamp.
libavformat: use MSG_NOSIGNAL when applicable

If the remote end of a connection oriented socket hangs up, generating
an EPIPE error is preferable over an unhandled SIGPIPE signal.

Signed-off-by: Martin Storsjö <martin@martin.st>
vfwcap: Add fallback define for HWND_MESSAGE

Some obsolete versions of the MinGW32 runtime (<4.0.0) lack the definition.
vc1: Fix the skip condition

As written in the comment above, skip must be added only if a
start code is found.
mpeg: Write H264 streams at offset 2

It hints that the content is H264 according to HD-DVD.
vc1: Initialize start_code_found to 0

Leftover of a4d3c20035946cbc1509aec2dc28d51c2a2f9a8e.
x11grab: K&R formatting cosmetics
x11grab: Small refactor

Near cosmetic refactorings.
x11grab: Drop a spurious space in the extension reporting message
x11grab: Use a typedef for the context

Match the current best practice.
x11grab: Fallback to normal XImage if SHM is not supported
x11grab: Refactor pixel format parsing
xcbgrab: XCB-based screen capture

Matches the x11grab screen capture by features.