我正在使用fluent-FFmpeg将m3u8视频流转换为音频流。输出的音频流具有可变的比特率。 如何获得恒定的比特率而不是可变的比特率?
我尝试提供
.addOption('-b:a 48k')
.addOption('-bufsize 48k')
保持48kbps的恒定比特率。但这没用。
这是代码示例:
const ffmpeg = require('fluent-ffmpeg');
const { Transform } = require('stream');
let dest = new Transform({
transform: (chunk, enc, next) => {
//chunk duration
next(null, chunk);
}
}).on('data', () => {});
let m3u8_url = 'https://fuel-streaming-prod01.fuelmedia.io/v1/sem/40f15d3b-689f-48a5-9c61-a4f9583ed619.m3u8';
let command = ffmpeg()
.format('flac') // required for working with streams
.on('start', function() {
console.log('ffmpeg : processing Started');
})
.on('progress', (progress) => {
console.log('ffmpeg : Processing');
})
.on('end', () => {
console.log('ffmpeg : Processing finished !');
})
.on('error', (err) => {
console.log('ffmpeg : ffmpeg error :' + err.message);
})
//.addOption('-b:a 48k')
//.addOption('-bufsize 48k')
.output(dest) //transform stream
.audioBitrate('48k')
.audioCodec('flac') // needed for getting proper metadata
command.run();