Fix progress bar, remove temp file on ffmpeg error (#66)

* Delete the video file on ffmpeg error

* rework chunk calculation (with more tests it turns out it was not good for all durations)

Co-authored-by: kylon <kylonux@gmail.com>

src/destreamer.ts

@@ -15,6 +15,7 @@ import isElevated from 'is-elevated';
 import puppeteer from 'puppeteer';
 import colors from 'colors';
 import path from 'path';
+import fs from 'fs';
 import sanitize from 'sanitize-filename';
 import cliProgress from 'cli-progress';
 
@@ -148,7 +149,6 @@ async function downloadVideo(videoUrls: string[], outputDirectories: string[], s
     const outDirsIdxInc = outputDirectories.length > 1 ? 1:0;
     for (let i=0, j=0, l=metadata.length; i<l; ++i, j+=outDirsIdxInc) {
         const video = metadata[i];
-        let previousChunks = 0;
         const pbar = new cliProgress.SingleBar({
             barCompleteChar: '\u2588',
             barIncompleteChar: '\u2591',
@@ -186,17 +186,15 @@ async function downloadVideo(videoUrls: string[], outputDirectories: string[], s
         // set events
         ffmpegCmd.on('update', (data: any) => {
             const currentChunks = ffmpegTimemarkToChunk(data.out_time);
-            const incChunk = currentChunks - previousChunks;
 
-            pbar.increment(incChunk, {
+            pbar.update(currentChunks, {
                 speed: data.bitrate
             });
-
-            previousChunks = currentChunks;
         });
 
         ffmpegCmd.on('error', (error: any) => {
             pbar.stop();
+            fs.unlinkSync(outputPath);
             console.log(`\nffmpeg returned an error: ${error.message}`);
             process.exit(ERROR_CODE.UNK_FFMPEG_ERROR);
         });