this post was submitted on 09 Jul 2023
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Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ
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Please somebody correct me if I'm wrong:
Separate audio is rarely available on streaming sites like YouTube, so if you're ripping a song from it, you essentially are transcoding the files three times:
So no matter how great the quality is at either of these transcoding ends, you are still transcoding in lossy format at least two times
yt-dlp can just download the audio. It usually comes down in m4a at quality that I would describe as "very listenable". So only the first of those three steps are mandatory if you do it that way.
yt-dlp -x <url>But is the source separate on YT's server is what I'm wondering.
If not, there's a transcoding stage
From my use of this, it downloads a video and extracts the audio stream from it. In fact, you can see this as it leaves the video file on disk while it's extracting the audio, and the audio-extraction process uses a decent amount of cpu (takes a few minutes for long concert sets on my raspberry pi). AFAICT, there's no way to only download the audio without incurring the unnecessary bandwidth and CPU usage.
Edit: I just checked and the CPU usage seems to be coming from the fact that I am asking yt-dlp to convert the audio format. Now I'm questioning whether it is actually the video that I've seen temporarily on disk or just the audio file in the youtube-native format.
It varies based on the age of the video, newer ones do indeed have separate audio downloads. You can force audio only with
yt-dlp -f bestaudio
This will cause the script to only consider audio-only formats, if bandwidth is a concern. However, how it decides which one is "best" is beyond me. For example, I tried one video and got a webm that contains only an audio track:
Here is an alternative Piped link(s): https://piped.video/watch?v=dQw4w9WgXcQ
https://piped.video/watch?v=dQw4w9WgXcQ
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I'm open-source, check me out at GitHub.
Yes, I deleted my comment after I checked the command line I was using and testing it out. The CPU usage was because I was using the
--audio-formatflag with something other than m4a/opus or whatever it is that youtube uses natively. And the file I saw on disk was not the video, it was the audio file in youtube's native format.For reference, I'm using
$ytdl -f "bestaudio/best" -ciw -o "$audioroot/%(title)s (%(upload_date>%Y-%m-%d)s).%(ext)s" --extract-audio --audio-quality 0 --audio-format mp3 "$vidurl".I haven't seen a YouTube video without a separate audio track. If you use yt-dlp just add -F and the URL to get all available download options/formats. Then use -f and the number of the download option and URL to download the video/audio. Audio on YouTube is available in two formats most of the time: opus and m4a.