求助关于 fluent-ffmpeg 输出文件的问题

This topic created in 2117 days ago, the information mentioned may be changed or developed.

想把 rtsp 的直播流转成一帧一帧的图片

通过命令行可以实现

ffmpeg -i "rtsp://admin:[email protected]/main/Channels/" -y -f image2  img%03d.jpg

在 nodejs 中使用 fluent-ffmpeg 实现了

const ffmpeg = require('fluent-ffmpeg')
const fs = require('fs')

let ffmpegPath = 'ffmpeg/ffmpeg.exe'
ffmpeg.setFfmpegPath(ffmpegPath)

let url = 'rtsp://admin:[email protected]/main/Channels/'
// ffmpeg -i "rtsp://admin:[email protected]/main/Channels/" -y -f image2  img%03d.jpg


ffmpeg(url)
  .addInputOption('-rtsp_transport', 'tcp', '-buffer_size', '102400') // 这里可以添加一些 RTSP 优化的参数
  // .outputOptions(['-vframes 1', '-fflags nobuffer', '-tune zerolatency']) // 每帧一张图
  .videoCodec('png') // 输出 PNG 格式图片
  .on('error', function (err, stdout, stderr) {
    console.log('错误信息', err.message);
  })
  .on('end', function () {
    console.log('结束' ,'Screenshots taken');
  })
  .on('codecData', function () {
    console.log('codecData 事件', 'Stream codecData.')
  })
  .output('img%03d.jpg').format("image2").noAudio().run()

但是上面两种方式都会直接生成图片有没有办法把图片的 buffer 获取到不写入文件中

Supplement 1 · Aug 4, 2020

我在用 pipe 方式可以获取到图片流但是只有第一张图片然后就报错了

const ffmpeg = require('fluent-ffmpeg')
const fs = require('fs')

let ffmpegPath = 'ffmpeg/ffmpeg.exe'
ffmpeg.setFfmpegPath(ffmpegPath)

let url = 'rtsp://admin:[email protected]/main/Channels/'
// ffmpeg -i "rtsp://admin:[email protected]/main/Channels/" -y -f image2 img%03d.jpg
let img = fs.createWriteStream('img.png')

ffmpeg(url)
 .addInputOption('-rtsp_transport', 'tcp', '-buffer_size', '102400') // 这里可以添加一些 RTSP 优化的参数
 .videoCodec('png') // 输出 PNG 格式图片
 .format("image2").noAudio().pipe().on('data', function(chunk) {
 img.write(chunk)
 console.log('ffmpeg just wrote ' + chunk.length + ' bytes');
 });

控制台信息

$ node index.js
codecData 事件 Stream codecData.
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 16017 bytes
错误信息 ffmpeg exited with code 1: av_interleaved_write_frame(): Invalid argument
frame= 10 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.08 bitrate=N/A speed=0.368x
video:1003kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!

FFmpeg

RTSP

img

1 replies

yangheng4922

Aug 3, 2020

我在用 pipe 方式可以获取到图片流但是只有第一张图片然后就报错了
```
const ffmpeg = require('fluent-ffmpeg')
const fs = require('fs')

let ffmpegPath = 'ffmpeg/ffmpeg.exe'
ffmpeg.setFfmpegPath(ffmpegPath)

let url = 'rtsp://admin:[email protected]/main/Channels/'
// ffmpeg -i "rtsp://admin:[email protected]/main/Channels/" -y -f image2 img%03d.jpg
let img = fs.createWriteStream('img.png')

ffmpeg(url)
.addInputOption('-rtsp_transport', 'tcp', '-buffer_size', '102400') // 这里可以添加一些 RTSP 优化的参数
// .outputOptions(['-vframes 1', '-fflags nobuffer', '-tune zerolatency']) // 每帧一张图
.videoCodec('png') // 输出 PNG 格式图片
.on('error', function (err, stdout, stderr) {
console.log('错误信息', err.message);
})
.on('end', function () {
console.log('结束' ,'Screenshots taken');
})
.on('codecData', function () {
console.log('codecData 事件', 'Stream codecData.')
})
.format("image2").noAudio().pipe().on('data', function(chunk) {
img.write(chunk)
console.log('ffmpeg just wrote ' + chunk.length + ' bytes');
});
```

控制台信息
```
$ node index.js
codecData 事件 Stream codecData.
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 98304 bytes
ffmpeg just wrote 16017 bytes
错误信息 ffmpeg exited with code 1: av_interleaved_write_frame(): Invalid argument
frame= 10 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.08 bitrate=N/A speed=0.368x
video:1003kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!
```

求助 关于 fluent-ffmpeg 输出文件的问题

求助关于 fluent-ffmpeg 输出文件的问题