Jessica Clarke authored 3 years ago and Anton Mitrofanov committed 3 years ago

Building a shared library without -fPIC does not make sense. On most
architectures, especially recent ones, doing so will give link-time
errors due to relocations in read-only sections like .text. On some
legacy architectures, including i386, it is allowed by default, but will
warn, and is highly discouraged due to the overheads it adds at library
load time. Most architectures were already listed here as having shared
imply PIC, but not all, such as i386 which ends up with unwanted text
relocations, as well as architectures not known to the build system
currently like RISC-V, which does not permit text relocations by
default. There is no good reason to want shared without PIC on any
architecture, so just remove the architecture list.

Back in 2009 when this was added it improved scheduling of lookahead
threads on prevalent operating systems at the time.

According to more recent testing by Intel however, lowering thread
priorities does not improve performance on modern operating systems.
And more importantly, doing so on systems with heterogeneous CPU
topologies may actually result in a severe performance reduction.

Removing this code altogether eliminates the issue with performance
degradation on such systems, while having no noticeable impact on
regular systems with homogeneous CPU topologies.

/usr/ucb/bin/install on Solaris does not support creating multiple
directories in one go, issue multiple install commands instead.

Jean-Baptiste Kempf authored 3 years ago and Anton Mitrofanov committed 3 years ago

The lookahead_thread main loop checks b_exit_thread and exits if it is set.
That flag is set by x264_lookahead_delete, which uses ifbuf.mutex to guard accessing it.
However, the read in the while-loop condition of lookahead_thread is not guarded,
and so TSAN sometimes reports a data race.

Martin Storsjö authored 3 years ago and Anton Mitrofanov committed 3 years ago

This fixes rerunning checkasm with an earlier printed seed, when
it's outside of the signed range.

Ziemowit Zabawa authored 3 years ago and Anton Mitrofanov committed 3 years ago

This includes fixing convert_method_to_flag so it recognizes "gauss"
parameter properly instead of silently defaulting to bicubic.

Particularly in code that makes heavy use of macros it's possible
to end up with 3-operand instructions with a memory operand in src1.
In the case of SSE this works fine due to automatic move insertions,
but in AVX that fails since memory operands are only allowed in src2.

The main purpose of this feature is to minimize the amount of code
changes required to facilitate conversion of existing SSE code to AVX.

ifb authored 6 years ago and Anton Mitrofanov committed 3 years ago

This allows for 2160p UHD at up to 960 Mbit/s.

Anton Mitrofanov authored 3 years ago and Anton Mitrofanov committed 3 years ago

Accept files created by MKVToolNix version 17.0.0 or newer.

Anton Mitrofanov authored 3 years ago and Anton Mitrofanov committed 3 years ago

Compilers are good at optimizing multiplication by shift.

Add the missing header as avcodec.h is no longer included in avformat.h.

ifb authored 3 years ago and Anton Mitrofanov committed 3 years ago

Use --cll to specify the maximum content light level (MaxCLL)
and the maximum frame average light level (MaxFALL) as described
by the CTA 861.3 specification.

ifb authored 5 years ago and Anton Mitrofanov committed 3 years ago

Use --mastering-display to specify the properties of the reference display.
A formatted string with all 10 values is required: G,B,R primaries and
white point coordinates, plus max/min brightness. Coordinates are in
0.00002 increments. Brightness units are 0.0001 cd/m^2.

For example, a 1000 nit BT.2020 display with a 0.0001 nit black level:
--mastering-display G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1)

Anton Mitrofanov authored 3 years ago and Anton Mitrofanov committed 3 years ago

Ignore empty string values for enum.

ffmpeg can now generate y4m files with sequence header length > 80.

Anton Mitrofanov authored 3 years ago and Anton Mitrofanov committed 3 years ago

Rename the old macos target to macos-x86_64.

Brad Smith authored 3 years ago and Anton Mitrofanov committed 3 years ago

On modern versions of OpenBSD, the number of processors online may differ from
the number of processors configured.

Use 'cmhs' (which does an unsigned greater or equal comparison)
instead of 'cmhi' (which does an unsigned greater comparison).

This makes sure that dct coeffs with a magnitude of 1 are recognized
in the output nnz buffer.

Henrik Gramner authored 4 years ago and Henrik Gramner committed 4 years ago

Large stack allocations on Windows need to use stack probing in order
to guarantee that all stack memory is committed before accessing it.
This is done by ensuring that the guard page(s) at the end of the
currently committed pages are touched prior to any pages beyond that.

Anton Mitrofanov authored 4 years ago and Anton Mitrofanov committed 4 years ago

Bug report by Zhengzhi Duan.

Make pointers to padded buffers aligned both before and after padding.