Implement loop audio #63 #71

README.md

@@ -123,6 +123,7 @@ Edit specs are JavaScript / JSON objects describing the whole edit operation wit
     },
   },
   audioFilePath,
+  loopAudio: false,
   keepSourceAudio: false,
   clips: [
     {
@@ -155,6 +156,7 @@ Edit specs are JavaScript / JSON objects describing the whole edit operation wit
 | `height` | `--height` | Height which all media will be converted to | auto based on `width` and aspect ratio of **first video** | |
 | `fps` | `--fps` | FPS which all videos will be converted to | First video FPS or `25` | |
 | `audioFilePath` | `--audio-file-path` | Set an audio track for the whole video | | |
+| `loopAudio` | `--loop-audio` | Loop the audio track if it is shorter than video? | | |
 | `keepSourceAudio` | `--keep-source-audio` | Keep audio from source files | | |
 | `fast` | `--fast`, `-f` | Fast mode (low resolution and FPS, useful for getting a quick preview) | `false` | |
 | `defaults.layer.fontPath` | `--font-path` | Set default font to a .ttf | System font | |

cli.js

@@ -32,6 +32,7 @@ const cli = meow(`
     --fps  FPS which all videos will be converted to
     --font-path  Set default font to a .ttf
     --audio-file-path  Add an audio track
+    --loop-audio  Loop the audio track if it is shorter than video?
     --keep-source-audio  Keep audio from source files
 
     --fast, -f  Fast mode (low resolution and FPS, useful for getting a quick preview)
@@ -53,6 +54,7 @@ const cli = meow(`
     width: { type: 'number' },
     height: { type: 'number' },
     fps: { type: 'number' },
+    loopAudio: { type: 'boolean' },
   },
 });
 
@@ -94,7 +96,7 @@ const cli = meow(`
     params.clips = clips.map((clip) => ({ layers: [clip] }));
   }
 
-  const { verbose, transitionName, transitionDuration, clipDuration, width, height, fps, audioFilePath, fontPath, fast, out: outPath, keepSourceAudio } = cli.flags;
+  const { verbose, transitionName, transitionDuration, clipDuration, width, height, fps, audioFilePath, fontPath, fast, out: outPath, keepSourceAudio, loopAudio } = cli.flags;
 
   if (transitionName || transitionDuration != null) {
     params.defaults.transition = {};
@@ -112,6 +114,7 @@ const cli = meow(`
 
   if (outPath) params.outPath = outPath;
   if (audioFilePath) params.audioFilePath = audioFilePath;
+  if (loopAudio) params.loopAudio = loopAudio;
   if (keepSourceAudio) params.keepSourceAudio = true;
   if (width) params.width = width;
   if (height) params.height = height;

examples/audioLoop.json5

@@ -0,0 +1,10 @@
+{
+  outPath: './audioLoop.mp4',
+  audioFilePath: './assets/winxp.mp3',
+  loopAudio: true,
+  // Should properly cut off and not crash with EPIPE if loopAudio=false and audio duration is shorter than total duration
+  // loopAudio: false,
+  clips: [
+    { duration: 10, layers: [{ type: 'title-background', text: 'Looping audio!' }] },
+  ],
+}

index.js

@@ -37,6 +37,7 @@ module.exports = async (config = {}) => {
     fps: requestedFps,
     defaults: defaultsIn = {},
     audioFilePath: audioFilePathIn,
+    loopAudio,
     keepSourceAudio,
 
     ffmpegPath = 'ffmpeg',
@@ -365,6 +366,8 @@ module.exports = async (config = {}) => {
       '-y', outPath,
     ];
 
+    const loopAudioArgs = loopAudio ? ['-stream_loop', '-1'] : [];
+
     const args = [
       ...(enableFfmpegLog ? [] : ['-hide_banner', '-loglevel', 'error']),
 
@@ -375,7 +378,7 @@ module.exports = async (config = {}) => {
       '-r', framerateStr,
       '-i', '-',
 
-      ...(audioFilePath ? ['-i', audioFilePath, '-shortest'] : []),
+      ...(audioFilePath ? [...loopAudioArgs, '-i', audioFilePath, '-shortest'] : []),
 
       '-map', '0:v:0',
       ...(audioFilePath ? ['-map', '1:a:0'] : []),