Analize video and audio duration of all .ts files in the same directory

extract-chunks-duration.ts

#!/usr/bin/env node
const fs = require('fs');
const execSync = require('child_process').execSync;

// Local dir ts files
const ts_files = fs.readdirSync('.').filter(fn => fn.endsWith('.ts'));

let n = 0;
const res_total = {video:{ duration_s: 0.0, frames: 0, fr: 0}, audio: { duration_s: 0.0, frames: 0, sr: 0}};
console.log(`Num, Filename, video dur {s}, video frames, audio dur {s}, audio frames, diff (v-a), video frame rate, audio sample rate`)
ts_files.forEach(ts_file => {
    const streams_data = get_streams_data(ts_file);

    console.log(`${n},${ts_file},${streams_data.video.duration_s},${streams_data.video.frames},${streams_data.audio.duration_s},${streams_data.audio.frames},${streams_data.video.duration_s - streams_data.audio.duration_s},${streams_data.video.fr},${streams_data.audio.sr}`)

    res_total.video.duration_s = res_total.video.duration_s + streams_data.video.duration_s;
    res_total.audio.duration_s = res_total.audio.duration_s + streams_data.audio.duration_s;
    res_total.video.frames = res_total.video.frames + streams_data.video.frames;
    res_total.audio.frames = res_total.audio.frames + streams_data.audio.frames;

    n = n + 1;
});

console.log('');
console.log(`Totals duration: video:${res_total.video.duration_s}, Audio:${res_total.audio.duration_s}, Diff (video - audio): ${res_total.video.duration_s - res_total.audio.duration_s}`);
console.log(`Totals Frames: video:${res_total.video.frames}, Audio:${res_total.audio.frames}`);

function get_streams_data(file) {
    const res = {video:{ duration_s: 0.0, frames: 0, fr: ''}, audio: { duration_s: 0.0, frames: 0, sr: ''}};
    
    const data_str = execSync(`ffprobe -count_frames -show_streams -print_format json ${file}`).toString();
    const data_json = JSON.parse(data_str);

    if ('streams' in data_json) {
        data_json.streams.forEach(stream => {
            if (('codec_type' in stream) && (stream.codec_type.toLowerCase() ==='video')) {
                if ('duration' in stream) {
                    res.video.duration_s = parseFloat(stream.duration);
                }
                if ('nb_read_frames' in stream) {
                    res.video.frames = parseInt(stream.nb_read_frames);
                }
                if ('r_frame_rate' in stream) {
                    res.video.fr = stream.r_frame_rate;
                }
            }
            else if (('codec_type' in stream) && (stream.codec_type.toLowerCase() ==='audio')) {
                if ('duration' in stream) {
                    res.audio.duration_s = parseFloat(stream.duration);
                }
                if ('nb_read_frames' in stream) {
                    res.audio.frames = parseInt(stream.nb_read_frames);
                }
                if ('codec_time_base' in stream) {
                    res.audio.sr = stream.codec_time_base;
                }
            }
        })
    }

    return res;
}