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Andreas Rheinhardt c85508f5a9 avcodec/mpeg12dec: Allocate dummy frames for non-I fields 
MPEG-2 allows to pair an intra field (as first field) together
with a P-field. In this case a conformant bitstream has to satisfy
certain restrictions in order to ensure that only the I field
is used for prediction. See section 7.6.3.5 of the MPEG-2
specifications.

We do not check these restrictions; normally we simply allocate
dummy frames for reference in order to avoid checks lateron.
This happens in ff_mpv_frame_start() and therefore does not happen
for a second field. This is inconsistent. Fix this by allocating
these dummy frames for the second field, too.

This already fixes two bugs:
1. Undefined pointer arithmetic in prefetch_motion() in
mpegvideo_motion.c where it is simply presumed that the reference
frame exists.
2. Several MPEG-2 hardware accelerations rely on last_picture
being allocated for P pictures and next picture for B pictures;
e.g. VDPAU returns VDP_STATUS_INVALID_HANDLE when decoding
an I-P fields pair because the forward_reference was set incorrectly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-06-12 10:50:12 +02:00
compat
doc lavc: bump minor and add APIchanges entry for new USAC profile 2024-06-08 00:22:36 +02:00
ffbuild riscv: add Zvbb vector bit manipulation extension 2024-05-11 11:38:49 +03:00
fftools fftools/ffmpeg_mux_init: Fix leak when using non-encoding option 2024-06-11 14:32:25 +02:00
libavcodec avcodec/mpeg12dec: Allocate dummy frames for non-I fields 2024-06-12 10:50:12 +02:00
libavdevice avdevice/xcbgrab: Check sscanf() return 2024-06-12 00:39:11 +02:00
libavfilter avfilter/vf_rotate: Check ff_draw_init2() return value 2024-06-12 00:39:14 +02:00
libavformat avformat/mov: Use int64_t in intermediate for corrected_dts 2024-06-12 00:39:13 +02:00
libavutil lavu/hwcontext_vulkan: Support write on drm frame 2024-06-12 01:53:18 +02:00
libpostproc
libswresample
libswscale riscv: probe for Zbb extension at load time 2024-06-11 20:12:37 +03:00
presets
tests riscv: probe for Zbb extension at load time 2024-06-11 20:12:37 +03:00
tools tools/decode_simple: Check avcodec_send_packet() for errors on flushing 2024-05-28 03:48:06 +02:00
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Changelog changelog: add entry for xHE-AAC 2024-06-02 18:34:46 +02:00
configure configure: Disable DNN without backend 2024-06-11 19:36:54 +08:00
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MAINTAINERS MAINTAINERS: add myself as *BSD maintainer 2024-05-13 03:40:16 +02:00
Makefile riscv: add Zvbb vector bit manipulation extension 2024-05-11 11:38:49 +03:00
README.md
RELEASE

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis tool to inspect multimedia content.
  • Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.