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Zhao Zhili 7cd416792a fftools/ffmpeg_filter: fix NULL pointer dereference 
In close_output(), a dummy frame is created with format NONE passed
to enc_open(), which isn't prepared for it. The NULL pointer
dereference happened at
av_pix_fmt_desc_get(enc_ctx->pix_fmt)->comp[0].depth.

When fgt.graph is NULL, skip fg_output_frame() since there is
nothing to output.

frame #0: 0x0000005555bc34a4 ffmpeg_g`enc_open(opaque=0xb400007efe2db690, frame=0xb400007efe2d9f70) at ffmpeg_enc.c:235:44
frame #1: 0x0000005555bef250 ffmpeg_g`enc_open(sch=0xb400007dde2d4090, enc=0xb400007e4e2daad0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:1462:11
frame #2: 0x0000005555bee094 ffmpeg_g`send_to_enc(sch=0xb400007dde2d4090, enc=0xb400007e4e2daad0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:1571:19
frame #3: 0x0000005555bee01c ffmpeg_g`sch_filter_send(sch=0xb400007dde2d4090, fg_idx=0, out_idx=0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:2154:12
frame #4: 0x0000005555bcf124 ffmpeg_g`close_output(ofp=0xb400007e4e2d85b0, fgt=0x0000007d1790eb08) at ffmpeg_filter.c:2225:15
frame #5: 0x0000005555bcb000 ffmpeg_g`fg_output_frame(ofp=0xb400007e4e2d85b0, fgt=0x0000007d1790eb08, frame=0x0000000000000000) at ffmpeg_filter.c:2317:16
frame #6: 0x0000005555bc7e48 ffmpeg_g`filter_thread(arg=0xb400007eae2ce7a0) at ffmpeg_filter.c:2836:15
frame #7: 0x0000005555bee568 ffmpeg_g`task_wrapper(arg=0xb400007d8e2db478) at ffmpeg_sched.c:2200:21

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
2023-12-21 19:29:53 +08:00
compat configure: Set WIN32_LEAN_AND_MEAN at configure time 2023-08-14 22:57:28 +03:00
doc fate: Allow running multiple rounds of tests with differing settings 2023-12-19 13:34:25 +02:00
ffbuild riscv: test for assembler support 2023-12-08 17:21:09 +02:00
fftools fftools/ffmpeg_filter: fix NULL pointer dereference 2023-12-21 19:29:53 +08:00
libavcodec avcodec/mediacodecenc: set quality in cq mode 2023-12-21 19:28:47 +08:00
libavdevice gdigrab: Fix hwnd parameter issues 2023-12-19 00:07:26 +02:00
libavfilter libavfilter/vf_dnn_detect: Add yolov4 support 2023-12-16 21:51:52 +08:00
libavformat avformat/file: seek back to initial position for fd protocol 2023-12-21 19:29:18 +08:00
libavutil avutil/iamf: add missing doxy to free functions 2023-12-19 11:15:44 -03:00
libpostproc Bump versions after 6.1 2023-10-29 16:19:14 +01:00
libswresample swr/swresample: avoid reapplication of firstpts 2023-12-18 15:47:04 +05:30
libswscale riscv: test for assembler support 2023-12-08 17:21:09 +02:00
presets
tests checkasm: Remove unnecessary const on scalar parameters 2023-12-21 00:14:41 +02:00
tools tools/target_dec_fuzzer: Adjust threshold for VMIX 2023-12-14 23:34:46 +01:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore gitignore: add config_components.h 2022-03-17 18:35:41 -03:00
.mailmap mailmap: remap my email accounts 2023-11-03 20:57:49 +08:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog avformat: Immersive Audio Model and Formats muxer 2023-12-18 15:21:47 -03:00
configure lavc/libopenh264: Drop openh264 runtime version checks 2023-12-18 23:59:51 +02:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
INSTALL.md INSTALL.md: Fix Markdown formatting 2019-01-31 10:29:16 -09:00
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS MAINTAINERS: Remove older s3tc entry 2023-12-10 03:25:23 -05:00
Makefile riscv: test for assembler support 2023-12-08 17:21:09 +02:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE RELEASE: update after 5.1 branch 2022-07-13 00:31:42 +02:00

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.