ffmpeg 常用命令

安装

sudo apt install ffmpeg

从 mp4 中提取 wav

ffmpeg -y -i "BV1hZ421g7xC.mp4" -vn -acodec pcm_s16le -ar 44100 -ac 2 "BV1hZ421g7xC.wav"

其中：

• -i "input.mp4"：输入文件为 input.mp4
• -vn：不包含视频流
• -acodec pcm_s16le：音频编码为 pcm_s16le
• -ar 44100：音频采样率为 44100
  • 降低该值以减小文件，例如可取 22050, 16000
• -ac 2：音频通道数为 2

See: ffmpeg - Extracting wav from mp4 while preserving the highest possible quality - Super User

• https://superuser.com/questions/609740/extracting-wav-from-mp4-while-preserving-the-highest-possible-quality

ffmpeg - Wav audio file compression not working - Stack Overflow

• https://stackoverflow.com/questions/34520694/wav-audio-file-compression-not-working

从 mp4 中提取 mp3

ffmpeg -y -i "BV1hZ421g7xC.mp4" -vn "BV1hZ421g7xC.mp3"