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About Youtube sound quality


Ake

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Hey guys

 

I once uploaded a DJ set to Youtube and used an MP3 320 kbps (LAME) file that was converted from the original WAV file to create the MP4 file for the upload, needless to say that i only used proper lossless files for the DJ set. Unfortunately i lost both, the MP3 and the WAV file of the DJ set. So i was hoping to be able to get at least the 'original upload audio quality' by using the premium version of 'Youtube to MP3 Converter', spent $9 for this. Anyway, windows and dbPoweramp tell me the audio quality is low, 95 kbps. Crap! So it seems to me that people listening to music on Youtube get very low MP3 quality all the time. Just letting you know. Correct me if i'm wrong about this.

 

Cheers

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There's not really a question in my above post, anyway might be interesting what people say about this as I'm not a computer geek so thanks and there you go:

 

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Alright, let's see...

$ youtube-dl --list-formats https://www.youtube.com/watch?v=AJ44v2fln_w
[youtube] AJ44v2fln_w: Downloading webpage
[youtube] AJ44v2fln_w: Downloading video info webpage
[youtube] AJ44v2fln_w: Extracting video information
WARNING: unable to extract uploader nickname
[youtube] AJ44v2fln_w: Downloading MPD manifest
[info] Available formats for AJ44v2fln_w:
format code  extension  resolution note
139          m4a        audio only DASH audio   66k , m4a_dash container, mp4a.40.5@ 48k (22050Hz)
140          m4a        audio only DASH audio  145k , m4a_dash container, mp4a.40.2@128k (44100Hz)
160          mp4        192x144    DASH video  108k , avc1.4d400b, 30fps, video only
134          mp4        480x360    DASH video  112k , avc1.4d401e, 30fps, video only
133          mp4        320x240    DASH video  242k , avc1.4d400c, 30fps, video only
137          mp4        1440x1080  DASH video  752k , avc1.640028, 30fps, video only
135          mp4        640x480    DASH video 1155k , avc1.4d4014, 30fps, video only
136          mp4        960x720    DASH video 2310k , avc1.4d4016, 30fps, video only
17           3gp        176x144    small , mp4v.20.3,  mp4a.40.2@ 24k
36           3gp        320x240    small , mp4v.20.3,  mp4a.40.2
18           mp4        480x360    medium , avc1.42001E,  mp4a.40.2@ 96k
43           webm       640x360    medium , vp8.0,  vorbis@128k
22           mp4        960x720    hd720 , avc1.64001F,  mp4a.40.2@192k (best)

$ youtube-dl -f 22 -x --audio-format best https://www.youtube.com/watch?v=AJ44v2fln_w
[youtube] AJ44v2fln_w: Downloading webpage
[youtube] AJ44v2fln_w: Downloading video info webpage
[youtube] AJ44v2fln_w: Extracting video information
WARNING: unable to extract uploader nickname
[youtube] AJ44v2fln_w: Downloading MPD manifest
[download] Destination: Butterfly Witchcraft (mixed by ake)-AJ44v2fln_w.mp4
[download] 100% of 479.18MiB in 02:33
[ffmpeg] Destination: Butterfly Witchcraft (mixed by ake)-AJ44v2fln_w.m4a

 

$ ls -la
108500367 Jan 23  2017 Butterfly Witchcraft (mixed by ake)-AJ44v2fln_w.m4a

$ ffprobe Butterfly\ Witchcraft\ \(mixed\ by\ ake\)-AJ44v2fln_w.m4a
ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Butterfly Witchcraft (mixed by ake)-AJ44v2fln_w.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 512
    compatible_brands: isomiso2
    creation_time   : 2017-01-23T15:37:25.000000Z
    encoder         : Lavf56.1.0
  Duration: 01:14:16.84, start: 0.000000, bitrate: 194 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      creation_time   : 2017-01-23T15:37:25.000000Z
      handler_name    : SoundHandler

 

Short version: apparently you can dump a 194 kbps m4a, and there's no need to pay $9 for it. However, recently there's been some talk about YouTube auto-applying dynamics processing and re-encoding so I cannot guarantee that the quality is really the same as in the original mp4. And as this is m4a, it won't be the same as the original mp3 that was used as the source for the video. At least one re-encoding has taken place in any case. Anyway, should be better than 95 kbps mp3.

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