https://github.com/devidw/11-mp3
https://github.com/devidw/11-mp3
Last synced: 3 months ago
JSON representation
- Host: GitHub
- URL: https://github.com/devidw/11-mp3
- Owner: devidw
- Created: 2024-12-13T22:35:32.000Z (6 months ago)
- Default Branch: main
- Last Pushed: 2024-12-13T22:35:34.000Z (6 months ago)
- Last Synced: 2025-03-09T23:38:16.999Z (3 months ago)
- Language: TypeScript
- Homepage:
- Size: 136 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
Awesome Lists containing this project
README
# issue
- bad.json was retrieved from ws tts
- bad.mp3 is the mp3 file from the base64 encoding (see write.ts)
- bad.mp3 web playback is fine, however when dealing with the file inside unity
for placback and using node av (and mp3) packages for procesing, it fails (see
to_wav.ts)
```
error: Uncaught (in promise) Error: bad main_data_begin pointer
at Layer3.decode (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/mp3/0.1.0/src/layer3.js:112:19)
at MP3Frame.decode (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/mp3/0.1.0/src/frame.js:31:13)
at Class.readChunk (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/mp3/0.1.0/src/decoder.js:40:19)
at Class.Decoder.decode (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/av/0.4.9/src/decoder.js:72:23)
at Class. (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/av/0.4.9/src/decoder.js:46:26)
at Class.EventEmitter.emit (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/av/0.4.9/src/core/events.js:64:12)
at Class.readChunk (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/mp3/0.1.0/src/demuxer.js:168:18)
at BufferSource. (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/av/0.4.9/src/demuxer.js:49:19)
at BufferSource.EventEmitter.emit (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/av/0.4.9/src/core/events.js:64:12)
at BufferSource.loop (file:///Users/devidw/Library/Caches/deno/npm/registry.npmjs.org/av/0.4.9/src/sources/buffer.js:49:21)
```
## cause?
ffmpeg inspection indicates several problems:
```bash
ffmpeg -i bad.mp3 -f null -
```
> [mp3 @ 0x158e2bcb0] Format mp3 detected only with low score of 25, misdetection possible!
> [mp3 @ 0x158e2bcb0] Skipping 114 bytes of junk at 0.
> [mp3 @ 0x158e2bcb0] Estimating duration from bitrate, this may be inaccurate
## re-encoding
re-rencoding with ffmpeg solves the issues, but is an expensive operation
```bash
ffmpeg -i bad.mp3 -c:a libmp3lame -y fix.mp3
```
## Qs
- q: elevenlabs should provide valid mp3 output that does not cause the issues
demonstrated?
- q (unrelated): why is elevenlabs base64 encoding audio instead of binary transfer via web
sockets, which would result in smaller data size thus lower latency