mov: do not set avg_frame_rate in the demuxer

The track duration is often not reliable or is not the duration
represented by the number of frames. In those cases, avg_frame_rate
was reported incorrectly. Removing this code falls back to the
default calculation in avformat_find_stream_info().

This is a partial revert of commit c3aeaa540.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
rtmpproto: Avoid using uninitialized memory

If the url ends with .flv, we stripped it but didn't initialize
rt->playpath, doing av_strlcat on an uninitialized buffer.

Signed-off-by: Martin Storsjö <martin@martin.st>
rtmpproto: Send a full, absolute timestamp if it isn't monotonically growing

The normal differential timestamps can't handle negative
differences, thus send a full packet header with an absolute
timestamp in these cases.

Signed-off-by: Martin Storsjö <martin@martin.st>
vc1: Always reset numref when parsing a new frame header.

Fixes an issue where the B-frame coding mode switches from interlaced
fields to interlaced frames, causing incorrect decisions in the motion
compensation code and resulting in visual artifacts.

CC: libav-stable@libav.org
Signed-off-by: Tim Walker <tdskywalker@gmail.com>
Merge commit 'd01e684186bc1631bc176f06b89d33c27ec0d24d'

* commit 'd01e684186bc1631bc176f06b89d33c27ec0d24d':
  mov: do not set avg_frame_rate in the demuxer

Conflicts:
	libavformat/mov.c

Not merged
The default fallback code that sets avg_frame_rate guesses the value
from a very small number of frames at the videos start and is wrong in
some cases for the file as a whole.
Now that makes it guess vs guess, but the code in mov is much faster

Also ideally the mov code should be fixed and give a exact avg_frame_rate
based on the actual cts from the index (CTTS/STTS)

If someone has sample(s) which show wrong fps values, please open a ticket
on trac or mail me if its private.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '24eb3c791606fe98a1591c13a8b2ba6c342bb3b5'

* commit '24eb3c791606fe98a1591c13a8b2ba6c342bb3b5':
  rtmpproto: Avoid using uninitialized memory

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '89564be444d24f75ea5add8b6987e414cf7aa7d5'

* commit '89564be444d24f75ea5add8b6987e414cf7aa7d5':
  rtmpproto: Send a full, absolute timestamp if it isn't monotonically growing

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  vc1: Always reset numref when parsing a new frame header.

Conflicts:
	libavcodec/vc1.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
examples/muxing: reduce duration, remove wrong and misleading comment

Set duration to 10 seconds, after it was increased from 5 to 200 seconds
in 8d80f3cb877b890889b1673029387229648901ed.

200 seconds will generate too much data which is annoying especially when
testing.