FFmpeg 4.0是这一全球最流行的视频处理工具在过去近两年时间内的一次重大更新，包括增加对3月刚刚完成1.0版定稿的AV1的支持。感谢FFmpeg开发者、OnVideo联合创始人刘歧提供新闻线索和审校。
文 / 包研
审校 / 刘歧
北京时间4月20日消息，全球最流行的视频处理工具FFmpeg发布了代号为“Wu”的4.0版，并在官网提供了下载地址（https://ffmpeg.org/download.html#releases）。
FFmpeg 4.0版更新重点更新如下，其中包括对今年3月刚刚1.0定稿的AV1的支持：
Bitstream filters for editing metadata in H.264, HEVC and MPEG-2 streams
Intel QSV-accelerated MJPEG encoding
NVIDIA NVDEC-accelerated H.264, HEVC, MJPEG, MPEG-1/2/4, VC1, VP8/9 hwaccel decoding
Intel QSV-accelerated overlay filter
OpenCL overlay filter
support LibreSSL (via libtls)
Removed the ffserver program
Add android_camera indev
AV1 Support through libaom
Haivision SRT protocol via libsrt
FFmpeg 4.0全部更新包括：
Bitstream filters for editing metadata in H.264, HEVC and MPEG-2 streams
Experimental MagicYUV encoder
TiVo ty/ty+ demuxer
Intel QSV-accelerated MJPEG encoding
native aptX and aptX HD encoder and decoder
NVIDIA NVDEC-accelerated H.264, HEVC, MJPEG, MPEG-1/2/4, VC1, VP8/9 hwaccel decoding
Intel QSV-accelerated overlay filter
mcompand audio filter
acontrast audio filter
OpenCL overlay filter
video mix filter
video normalize filter
audio lv2 wrapper filter
VAAPI MJPEG and VP8 decoding
AMD AMF H.264 and HEVC encoders
video fillborders filter
video setrange filter
support LibreSSL (via libtls)
Dropped support for building for Windows XP. The minimum supported Windows version is Windows Vista.
deconvolve video filter
entropy video filter
hilbert audio filter source
aiir audio filter
Removed the ffserver program
Removed the ffmenc and ffmdec muxer and demuxer
VideoToolbox HEVC encoder and hwaccel
VAAPI-accelerated ProcAmp (color balance), denoise and sharpness filters
Add android_camera indev
codec2 en/decoding via libcodec2
native SBC encoder and decoder
drmeter audio filter
hapqa_extract bitstream filter
filter_units bitstream filter
AV1 Support through libaom
E-AC-3 dependent frames support
bitstream filter for extracting E-AC-3 core
Haivision SRT protocol via libsrt
vfrdet filter
《FFmpeg从入门到精通》
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