availability time of Nth segment = availabilityStartTime + (N*segment duration) - availabilityTimeOffset.
This field helps to reduce the latency by about a segment duration in streaming mode.

@availabilityStartTime specifies the anchor for the computation of the earliest
availability time (in UTC) for any Segment in the Media Presentation.

As per this requirement, the @AvailabilityStartTime should be set to the
wallclock time at which the first frame of the first segment begins encoding.
But, it was getting set only when the first segment was completely ready. Making
the required correction in this patch. This correction is mainly needed to reduce
the latency in live streaming use cases.

Calling 'write_manifest' from 'write_header' was causing creation of
first MPD with invalid values. Ex: zero @duration param value. Also,
the manifest files (MPD or M3U8s) should be created when at-least
one media frame is ready for consumption.

When use_template is enabled and use_timeline is disabled, typically
it is required to generate the segments at the configured segment duration
rate on an average. This commit is particularly needed to handle the
segmentation when video frame rates are fractional like 29.97 or 59.94 fps.

There are use cases where average segment duration needs to be configured
and muxer is expected to maintain the average segment duration. So, using
the name 'min_seg_duration' will be misleading. So, changing the parameter
name to 'seg_duration', where it can be minimum segment duration or average
segment duration based on the use-case. The additional updates needed for
this functinality are made the sub-sequent patches of this patch series.

The HLSContext struct contains fields which duplicate the data stored in the
avio_opts field. This change removes those fields in favor of avio_opts, and
updates the code accordingly.
The original patch caused the buffer pointed to by new_cookies in open_url to be
leaked. The only thing that buffer is used for is to store the value until it
can be passed to av_dict_set. To fix the leak, v2 of the patch simply calls
av_dict_set with the AV_DICT_DONT_STRDUP_VAL flag, so that the dictionary takes
ownership of the memory instead of copying it again.
Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: Richard Shaffer <rshaffer@tunein.com>

The rw_timeout option is currently not applied when opening media playlist,
segment, or encryption key URLs. This can cause the HLS demuxer to block
indefinitely, even when the rw_timeout option has been specified. This change
simply enables carrying over the rw_timeout option when the demuxer opens these
URLs.
Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: Richard Shaffer <rshaffer@tunein.com>

libavformat/dashdec: Avoid multiple HTTP requests for initialization segment that is common among all representations
Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: sanilraut <raut.sanil@gmail.com>

This reverts commit 36deec01.

Revert "avformat/dashdec: Avoid multiple HTTP requests for initialization segment that is common among all representations"

This reverts commit 4effd1c4.

The rw_timeout option is currently not applied when opening media playlist,
segment, or encryption key URLs. This can cause the HLS demuxer to block
indefinitely, even when the rw_timeout option has been specified. This change
simply enables carrying over the rw_timeout option when the demuxer opens these
URLs.
Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: Richard Shaffer <rshaffer@tunein.com>

avformat/dashdec: Avoid multiple HTTP requests for initialization segment that is common among all representations
Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
Signed-off-by: sanilraut <raut.sanil@gmail.com>

Reviewed-by: Jun Zhao <mypopydev@gmail.com>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

This was somehow forgotten and nobody noticed until now.

Thanks-to: Moritz Barsnick <barsnick@gmx.net> for finding the correct ones
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Also increase max allowed dry/wet value.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

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

Usage of packet queueing API and some cleaning done by the committer.
Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

This prevents creating potentially broken files, as both the AV1 and
the AV1 in ISOMBFF specs are unfinished.
Signed-off-by: James Almer <jamrial@gmail.com>

Some old mingw-w64 builds seem to provide an incomplete implementation
of the API. Add an extra check to make sure it's disabled for those.
Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

draw a color line for the max level in the given duration

linear (current behaviour) or log display (more close to classic audio meter)

Signed-off-by: Paul B Mahol <onemda@gmail.com>

and refine the warning message when use both hls_key_info_file and hls_enc
Reviewed-by: Gyan Doshi <ffmpeg@gyani.pro>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

Also minor cosmetics.

Adds support for AMF initialisation from a DXVA2 (Direct3D9) device, and
then allows passing DXVA2 surfaces into an AMF encoder.
Signed-off-by: Mark Thompson <sw@jkqxz.net>

Signed-off-by: Mark Thompson <sw@jkqxz.net>

Supplying a hardware input frame which is not in the input hardware frames
context is not allowed by the API, so additional code to handle it is not
necessary.  Further, handling it automatically results in very low
performance - it is more appropriate to fail immediately so that the user
can fix their incorrect setup.

If the user supplies a device or frames context then it is an error
not to use it; this is consistent with other hardware components.

Also factorise out the D3D11 initialisation and improve error
messages.