Allocate just one and reuse it.

Fixes ticket #747.

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>

This patch adds a select_region option to the xcbgrab input device.
If set to 1, the user will be prompted to select the grabbing area
graphically by clicking and dragging. A rectangle will be drawn to
mark the grabbing area. A single click with no dragging will select
the whole screen. The option overwrites the video_size, grab_x, and
grab_y options if set by the user.

For testing, just set the select_region option as follows:

ffmpeg -f x11grab -select_region 1 -i :0.0 output.mp4

The drawing happens directly on the root window using standard rubber
banding techniques, so it is very efficient and doesn't depend on any
X extensions or compositors.

Reviewed-by: Andriy Gelman <andriy.gelman@gmail.com>
Signed-off-by: Omar Emara <mail@OmarEmara.dev>

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>

Signed-off-by: James Almer <jamrial@gmail.com>

This way the old max queue size limit based behavior for streams
where each individual packet is large is kept, while for smaller
streams more packets can be buffered (current default is at 50
megabytes per stream).

For some explanation, by default ffmpeg copies packets from before
the appointed seek point/start time and puts them into the local
muxing queue. Before, it getting utilized was much less likely
since as soon as the filter chain was initialized, the encoder
(and thus output stream) was also initialized.

Now, since we will be pushing the encoder initialization to when the
first AVFrame is decoded and filtered - which only happens after
the exact seek point is hit as packets are ignored until then -
this queue will be seeing much more usage.

In more layman's terms, this attempts to fix cases such as where:
- seek point ends up being 5 seconds before requested time.
- audio is set to copy, and thus immediately begins filling the
  muxing queue.
- video is being encoded, and thus all received packets are skipped
  until the requested time is hit.

then we can set the rtp read timeout instead of infinite timeout.

How to test(5s timeout):
./ffprobe -i rtp://192.168.1.67:1234?timeout=5000000

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

Signed-off-by: hwren <hwrenx@126.com>

Extend aphasemeter to detect out of phase or mono sequences in
stereo streams.

Signed-off-by: Romane Lafon <romane@nomalab.com>

Signed-off-by: hbj <hanbj@pku.edu.cn>
Signed-off-by: hwren <hwrenx@126.com>

The manual states "there is virtually no reason to use that encoder.".

It supports less sample formats than the native encoder, is less efficient
than the native encoder and is also slower and pretty much remains untested.
libwavpack also isn't being fuzzed, which given that we plug the parameters
without any sanitizing them looks concerning.

A common pattern e.g. in libavcodec is replacing/updating buffer
references: unref old one, ref new one. This function allows simplifying
such code and avoiding unnecessary refs+unrefs if the references are
already equivalent.

misc style fixes.

Reviewed-by: Steven Liu <liuqi05@kuaishou.com>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>

Signed-off-by: Marton Balint <cus@passwd.hu>

Signed-off-by: Marton Balint <cus@passwd.hu>

Signed-off-by: Marton Balint <cus@passwd.hu>

Signed-off-by: liushuyu <liushuyu@aosc.io>

* chroma-derived-nc / chroma-derived-c and ictcp

Signed-off-by: Harry Mallon <harry.mallon@codex.online>
Signed-off-by: Gyan Doshi <ffmpeg@gyani.pro>

Allow to set the EOF timestamp.

Also: doc/filters/testsrc*: specify the rounding of the duration option.

The changes in the ref files are right.

For filter-fps-down, the graph is testsrc2=r=7:d=3.5,fps=3.
3.5=24.5/7, so the EOF of testsrc2 will have PTS 25/7.
25/7=(10+5/7)/3, so the EOF PTS for fps should be 11/7,
and the output should contain a frame at PTS 10.

For filter-fps-up, the graph is testsrc2=r=3:d=2,fps=7,
for filter-fps-up-round-down and filter-fps-up-round-up
it is the same with explicit rounding options.
But there is no rounding: testsrc2 produces exactly 6 frames
and 2 seconds, fps converts it into exactly 14 frames.

The tests should probably be adjusted to restore them to
a useful coverage.

It will allow to include it.

Expressions for option fontsize of video filter drawtext have been
supported since commit 6442e4ab3c.

Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com>
Revised-by: Gyan Doshi <ffmpeg@gyani.pro>

Signed-off-by: Aman Verma <amanraoverma@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>