如何在C ++中使用ffmpeg提取音频形式的视频? [英] How to extract audio form video using ffmpeg in C++?

问题描述

我正在开发一个使用FFmpeg播放音频/视频的C ++应用程序.现在，我想增强该应用程序，以允许用户从视频中提取音频. FFmpeg如何用于此目的?我对此进行了很多搜索，但找不到有关它的教程.

I'm developing a C++ app that uses FFmpeg to play audio/video. Now I want to enhance the application to allow the users to extract audio from video. How can FFmpeg can be used for this? I searched a lot about this but I was not able to find a tutorial regarding it.

推荐答案

您需要

1. 打开输入上下文[avformat_open_input]
2. 获取流信息[avformat_find_stream_info]
3. 获取音频流:

1. Open the input context [ avformat_open_input ]
2. Get the stream information [ avformat_find_stream_info ]
3. Get the audio stream:

if (inputFormatContext->streams[index]->codec->codec_type ==
    AVMEDIA_TYPE_AUDIO) {
  inputAudioStream = inputFormatContext->streams[index];
}

1. 读取每个数据包. AVPacket数据包；

1. Read each packet. AVPacket packet;

int ret = av_read_frame(inputFormatContext, &packet);
if (ret == 0) {
  if (packet.stream_index == inputAudioStream->index) {
    // packet.data will have encoded audio data.
  }
}

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