使用 fluent-ffmpeg 处理视频 output 文件持续时间减半

Question

I have a node server set up and it takes a file for pre-processing. When using only ffmpeg library, files are processed with no problem, when using fluent-ffmpeg, if a video is 20 seconds, the output will only be the last half of the video (10 seconds). I've tried multiple files of varying length and with same issue. Any idea why this would happen?

const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
const ffprobePath = require('@ffprobe-installer/ffprobe').path;
const ffmpeg = require('fluent-ffmpeg');

...

ffmpeg.setFfmpegPath(ffmpegPath);
ffmpeg.setFfprobePath(ffprobePath);

ffmpeg('video.mov').videoBitrate('512k').output('./output/video.mov')
    .on('error', function(err, stdout, stderr) {
      console.log('Cannot process video: ' + err.message);
    }).screenshots({
      count: 1,
      size:'640x480'
    });

Answer 1

Turns out I misunderstood docs... can't incorporate both input processing and screenshots in same call... should be

ffmpeg('video.mov').videoBitrate('512k')
    .output('./output/video.mov')
    .on('error', function(err, stdout, stderr) {
      console.log('Cannot process video: ' + err.message);
    });

and separately

ffmpeg('video.mov').screenshots({
      count: 1,
      size:'640x480'
    });