This will effectively disable the cache but allows the cache layer to verify
cached files against the original input file. Useful only for debugging
the shared cache protocol itself, as file corruption can already be caught by
the CRC check.
This adds a new protocol shared:URI which is distinct from the existing
`cache:` in that it is explicity designed to be thread-safe and cross-process,
enabling multiple ffmpeg processes (or multiple ffmpeg decoders within the same
process) to share a single cache file, for e.g. a remote HTTP stream. As such,
it uses a radically different internal design.
To facilitate zero-knowledge cross-process interoperability, the cache file
itself is just a memory-mapped representation of the underlying file data,
which has the side benefit that the resulting cache file will contain a
working copy of the streamed file (assuming the stream was read to
completion).
To keep track of which regions are cached and which are not, we use a
secondary file that contains a minimal header along with a static bytemap of
blocks within the file. This secondary file is also used to store metadata
such as the filesize, if known, as well as marking "failed" blocks.
Both files can grow dynamically in order to accommodate larger/growing files,
and can be atomically updated (through the use of shared space maps). I have
extensively checked the space map initalization and update code for race
conditions, and I believe the current design to be solid.
That said, it is the user's responsibility to some extent to ensure that the
same URI is not used for different streams, as we rely on the URI to uniquely
identify the cache files. That said, we use a cryptographic hash with
sufficient collision resistance to protect against possible abuse. The lack of
any implicit default on `-cache_dir` also means that `shared:` can't be enabled
via URL injection to possibly access random files on the disk (or intentionally
leak content from other streams with similar URIs, even if the cryptograhic
hash function is broken).
If the input is expected to grow, we shouldn't make any assumptions about
the file size. This matches e.g. the behavior of streamed protocols like
chunked HTTP, which similarly return ENOSYS for streams of unknown size.
Sponsored-by: nxtedition AB
Signed-off-by: Niklas Haas <git@haasn.dev>
This allows constraining the set of available backends. This serves as a
better replacement for the "unstable" flag, which is a bit ambiguous. Allows
users to, for example, opt into the memcpy or x86 backend, while excluding
e.g. the upcoming JIT backends.
Signed-off-by: Niklas Haas <git@haasn.dev>
These are needed for interop with e.g. libplacebo, which needs to know the
correct flags to call vkGetDeviceQueue2.
Signed-off-by: Niklas Haas <git@haasn.dev>
It's been replaced with AVStreamGroupLayeredVideo, which is functionally the
same while generic enough to be shared with other kinds of layered video
implementations.
Signed-off-by: James Almer <jamrial@gmail.com>
Carries a raw HEVCDecoderConfigurationRecord for the Dolby Vision
enhancement layer, parsed from the hvcE box (ISOM) or the corresponding
BlockAdditionMapping (Matroska).
libcelt, which it depends on, was not updated in a very long time and is
considered deprecated, as Opus exists which has a CELT mode. Therefore
remove standalone CELT decoding support.
It was already broken since b8604a9761,
11 years ago, and no one noticed and complained.
According to Chapter 3, Paragraph 2 of the "SI Brochure - 9th ed./version 3.02":
> Prefix symbols are printed in upright typeface, as are unit symbols,
> regardless of the typeface used in the surrounding text and are
> attached to unit symbols without a space between the prefix symbol
> and the unit symbol.
https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf
av_program_add_stream_index() added in 526efa1053
may fail to carry out its purpose but the lack of
a return value stops callers from catching any error.
Fixed in new function.
This patch adds the transpose_cuda video filter.
It's similar to the existing transpose filter but accelerated by CUDA.
It supports the same pixel formats as the scale_cuda filter.
This also supersedes the deprecated transpose_npp filter.
Example usage:
ffmpeg -hwaccel cuda -hwaccel_output_format cuda -i <INPUT> -vf "transpose_cuda=dir=clock" <OUTPUT>
Signed-off-by: nyanmisaka <nst799610810@gmail.com>
Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>
Add a top-level title and demote former section headings (MD041-style hierarchy).
Add blank lines around headings and fenced code blocks where appropriate (MD022 and MD031-style). Some Markdown parsers, including kramdown, only recognize headings that are preceded by a blank line.
This incorrectly lists the libavcodec major version as 60 instead of
62. Also fix the date and commit hash while at it
Fixes: 7faa6ee2aa ("libavformat/matroska: Support smpte 2094-50 metadata")
Signed-off-by: llyyr <llyyr.public@gmail.com>
SMPTE-2094-50 is an upcoming standard that is close to being
finalized.
Define a side data type for carrying this metadata. And add
functions for parsing and writing it. This is very similar to
the handling of HDR10+ metadata.
The spec is available here: https://github.com/SMPTE/st2094-50
Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Add a muxer for the Playdate PDV container format.
The muxer writes the frame table and packet layout required by the
Playdate runtime. It requires seekable output and a predeclared
maximum number of frames (-max_frames).
Includes validation for single video stream input, dimension and
framerate checks, and bounded payload/table offset checks. The frame
entry table is allocated once in write_header() using max_frames + 1.
Document the muxer in doc/muxers.texi and add a Changelog entry.
-vf_vpp_amf.c: Remove unused variables.
-vf_amf_common.c: Fix hdrmeta_buffer memory leak.
-hwcontext_amf.c: Fix av_amf_extract_hdr_metadata not picking up light metadata if display mastering metadata is not set.
-doc/filters.texi: Remove irrelevant example with HDR metadata for vpp_amf.
Fix the default value of mpegts_original_network_id from 0x0001 to
0xff01 to match the actual code (DVB_PRIVATE_NETWORK_START).
Add the missing hevc_digital_hdtv service type to the
mpegts_service_type option list.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
The cosmetic-changes policy in developer.texi was written during the SVN
era, when reviewing indentation changes mixed with functional changes
was genuinely difficult.
Since FFmpeg has moved to Git, reviewers now have simple built-in tools
to ignore whitespace changes:
git diff -w
git log -p --ignore-all-space
Forgejo's pull request UI also offers a 'Hide whitespace changes'
toggle, making it trivial to focus on the functional diff.
For those who prefer reviewing patches in their mail client, the same
result can be achieved by saving the patch and running:
git apply --ignore-whitespace <patch> && git diff -w
Relax the policy so that indentation changes which are invisible to
git diff --ignore-all-space may accompany functional changes, while
still requiring non-whitespace cosmetic changes to be in separate
commits.
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
Specifically output side data from tile groups with -show_stream_groups
which includes rotation information in HEIC images.
Signed-off-by: Jeremy James <jeremy.james@gmail.com>
The output file fopen() result is not checked. If it fails (e.g.
permission denied or invalid path), output_file is NULL and the
subsequent fwrite() call will crash.
Add a NULL check with an error message, consistent with the
existing error handling pattern in this example.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
BejoyandGyan Doshi
Lynne
Andreas RheinhardtandJames Almer
Niklas Haas
Kacper Michajłow
Romain Beauxisandtoots
Jerome Berclazandmichaelni
RossWangandRomain Beauxis
Marvin ScholzandLynne
Ramiro Polla
Stuart Eichert
ldm0andmichaelni
Gyan Doshi
Dmitrii GershenkopandArazIusubov
Paul AdenotandLynne
nyanmisakaandTimo Rothenpieler
Arien ShibaniandGyan Doshi
llyyrandLeo Izen
Vignesh VenkatandJames Almer
Priyanshu Thapliyalandmichaelni
Patrice DumasandRamiro Polla
Dmitrii GershenkopandArazIusubov
Jun ZhaoandJun Zhao
WyattBlueandMarton Balint
Zhao ZhiliandGyan Doshi
Jeremy JamesandJames Almer