FFmpeg-Builds-AT

A BtbN/FFmpeg-Builds fork focusing on AudioToolbox/Win64.

Supports-c:a aac_at on Windows.

Packages removed from this fork:

• openh264 - left libx264.
• kvazaar - left libx265.
• aom - left dav1d, rav1e and svtav1.

Installation

Choose either one of the two:

• Install Apple iTunes using the official installer. No further steps needed.

• Extract files from iTunes. Same as QTFiles for qaac
  On x64 OS, The folder tree looks like this:

  |   ffmpeg.exe
  \-- QTfiles64
      |   ASL.dll
      |   CoreAudioToolbox.dll
      |   CoreFoundation.dll
      |   icudt62.dll
      |   libdispatch.dll
      |   libicuin.dll
      |   libicuuc.dll
      |   objc.dll

Tips

-q 0 gives the best quality, and -q 14 gives the smallest file.
Some useful parameters are:
-q 4 gives ~192 Kbps stereo, very high quality, recommended for movies.
-q 3 gives ~224 Kbps stereo, transparent, use it for opera, live, etc.

For low-res lectures, use -profile:a 4 -b:a 48k for HE-AAC at 48 Kbps.

Examples

# a movie:
ffmpeg -i input.mkv -c:a aac_at -q 4 output.mkv

# a lecture for watching at home:
ffmpeg -i input.mkv -c:a aac_at -profile:a 4 -b:a 64k output.mkv

# a lecture for listening in-car:
ffmpeg -i input.mkv -map 0:a -c:a aac_at -profile:a 4 -b:a 48k output.m4a

# To get some help
ffmpeg -h encoder=aac_at

BtbN/FFmpeg-Builds README.md

FFmpeg Static Auto-Builds

Static Windows (x86_64) and Linux (x86_64) Builds of ffmpeg master and latest release branch.

Windows builds are targetting Windows 7 and newer.

Linux builds are targetting RHEL/CentOS 8 (glibc-2.28 + linux-4.18) and anything more recent.

Auto-Builds

Builds run daily at 12:00 UTC (or GitHubs idea of that time) and are automatically released on success.

Auto-Builds run ONLY for win64 and linux(arm)64. There are no win32/x86 auto-builds, though you can produce win32 builds yourself following the instructions below.

Release Retention Policy

• The last build of each month is kept for two years.
• The last 14 daily builds are kept.
• The special "latest" build floats and provides consistent URLs always pointing to the latest build.

Package List

For a list of included dependencies check the scripts.d directory. Every file corresponds to its respective package.

How to make a build

Prerequisites

• bash
• docker

Build Image

• ./makeimage.sh target variant [addin [addin] [addin] ...]

Build FFmpeg

• ./build.sh target variant [addin [addin] [addin] ...]

On success, the resulting zip file will be in the artifacts subdir.

Targets, Variants and Addins

Available targets:

• win64 (x86_64 Windows)
• win32 (x86 Windows)
• linux64 (x86_64 Linux, glibc>=2.28, linux>=4.18)
• linuxarm64 (arm64 (aarch64) Linux, glibc>=2.28, linux>=4.18)

The linuxarm64 target will not build some dependencies due to lack of arm64 (aarch64) architecture support or cross-compiling restrictions.

• davs2 and xavs2: aarch64 support is broken.
• libmfx and libva: Library for Intel QSV, so there is no aarch64 support.

Available variants:

• gpl Includes all dependencies, even those that require full GPL instead of just LGPL.
• lgpl Lacking libraries that are GPL-only. Most prominently libx264 and libx265.
• nonfree Includes fdk-aac in addition to all the dependencies of the gpl variant.
• gpl-shared Same as gpl, but comes with the libav* family of shared libs instead of pure static executables.
• lgpl-shared Same again, but with the lgpl set of dependencies.
• nonfree-shared Same again, but with the nonfree set of dependencies.

All of those can be optionally combined with any combination of addins:

• 4.4/5.0/5.1/6.0 to build from the respective release branch instead of master.
• debug to not strip debug symbols from the binaries. This increases the output size by about 250MB.
• lto build all dependencies and ffmpeg with -flto=auto (HIGHLY EXPERIMENTAL, broken for Windows, sometimes works for Linux)