M1 安装 ffmpeg
brew install ffmpeg
安装完成输入
ffmpeg -version
可以看到下面信息
ffmpeg version 5.1.1 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.1.1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
libavutil 57. 28.100 / 57. 28.100
libavcodec 59. 37.100 / 59. 37.100
libavformat 59. 27.100 / 59. 27.100
libavdevice 59. 7.100 / 59. 7.100
libavfilter 8. 44.100 / 8. 44.100
libswscale 6. 7.100 / 6. 7.100
libswresample 4. 7.100 / 4. 7.100
libpostproc 56. 6.100 / 56. 6.100
安装 libmp3lame
1.下载开源编码库libmp3lame,然后编译、安装到系统
https://nchc.dl.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz
# cd lame-3.100
# ./configure --enable-shared --enable-static
# make -j4
# sudo make install
报错 _lame_init_old 找到 libmp3lame.sym 文件 将 lame_init_old 删除 重新执行命令即可
Undefined symbols for architecture arm64:
"_lame_init_old", referenced from:
-exported_symbol[s_list] command line option
ld: symbol(s) not found for architecture arm64
clang: **error:** **linker command failed with exit code 1 (use -v to see invocation)**
make[2]: *** [libmp3lame.la] Error 1
make[1]: *** [install-recursive] Error 1
make: *** [install-recursive] Error 1
基于 libmp3lame 转换
ffmepg -i input.wav -f mp3 -acodec libmp3lame -y output.mp3
在iOS 项目中 播放完 无法再次播放 可以试用下面这种方式
ffmepg -i input.wav -f mp2 output.mp3
如果还不可以，可以尝试 将裁剪为 整秒的视频
ffmpeg -i input.mp3 -ss 00:00:00 -t 00:00:05 -acodec copy output.mp3
