[Bug] Bug/feature request - Hyphenated formats wrong redirect.

[barkoder]

Both a bug report and a feature request. (I don't know which label to file this under.)

$ yt-dlp -F m9Lz4v265tk | grep 'audio only'
600-0        webm       audio only  [en] ultralow,   30k, webm_dash containervideo@   0k, opus @ 30k (48000Hz), 7.13MiB
599-0        m4a        audio only  [en] ultralow,   30k, m4a_dash containervideo@   0k, mp4a.40.5@ 30k (22050Hz), 7.30MiB
249-0        webm       audio only  [en] low,   45k, webm_dash containervideo@   0k, opus @ 45k (48000Hz), 10.73MiB
139-0        m4a        audio only  [es-US] Spanish (United States), low,   48k, m4a_dash containervideo@   0k, mp4a.40.5@ 48k (22050Hz), 11.56MiB
139-1        m4a        audio only  [de-DE] German (Germany), low,   48k, m4a_dash containervideo@   0k, mp4a.40.5@ 48k (22050Hz), 11.56MiB
139-2        m4a        audio only  [fr-FR] French (France), low,   48k, m4a_dash containervideo@   0k, mp4a.40.5@ 48k (22050Hz), 11.56MiB
139-3        m4a        audio only  [it] Italian, low,   48k, m4a_dash containervideo@   0k, mp4a.40.5@ 48k (22050Hz), 11.56MiB
139-4        m4a        audio only  [pt-BR] Portuguese (Brazil), low,   48k, m4a_dash containervideo@   0k, mp4a.40.5@ 48k (22050Hz), 11.56MiB
139-5        m4a        audio only  [en] low,   48k, m4a_dash containervideo@   0k, mp4a.40.5@ 48k (22050Hz), 11.56MiB
249-1        webm       audio only  [fr-FR] French (France), low,   50k, webm_dash containervideo@   0k, opus @ 50k (48000Hz), 12.04MiB
249-2        webm       audio only  [es-US] Spanish (United States), low,   51k, webm_dash containervideo@   0k, opus @ 51k (48000Hz), 12.12MiB
249-3        webm       audio only  [it] Italian, low,   51k, webm_dash containervideo@   0k, opus @ 51k (48000Hz), 12.13MiB
249-4        webm       audio only  [de-DE] German (Germany), low,   51k, webm_dash containervideo@   0k, opus @ 51k (48000Hz), 12.22MiB
249-5        webm       audio only  [pt-BR] Portuguese (Brazil), low,   51k, webm_dash containervideo@   0k, opus @ 51k (48000Hz), 12.26MiB
250-0        webm       audio only  [en] low,   59k, webm_dash containervideo@   0k, opus @ 59k (48000Hz), 14.08MiB
250-1        webm       audio only  [fr-FR] French (France), low,   65k, webm_dash containervideo@   0k, opus @ 65k (48000Hz), 15.54MiB
250-2        webm       audio only  [es-US] Spanish (United States), low,   66k, webm_dash containervideo@   0k, opus @ 66k (48000Hz), 15.65MiB
250-3        webm       audio only  [it] Italian, low,   66k, webm_dash containervideo@   0k, opus @ 66k (48000Hz), 15.66MiB
250-4        webm       audio only  [de-DE] German (Germany), low,   66k, webm_dash containervideo@   0k, opus @ 66k (48000Hz), 15.79MiB
250-5        webm       audio only  [pt-BR] Portuguese (Brazil), low,   66k, webm_dash containervideo@   0k, opus @ 66k (48000Hz), 15.83MiB
251-0        webm       audio only  [en] medium,  119k, webm_dash containervideo@   0k, opus @119k (48000Hz), 28.40MiB
251-1        webm       audio only  [fr-FR] French (France), medium,  126k, webm_dash containervideo@   0k, opus @126k (48000Hz), 29.86MiB
251-2        webm       audio only  [es-US] Spanish (United States), medium,  126k, webm_dash containervideo@   0k, opus @126k (48000Hz), 30.05MiB
251-3        webm       audio only  [it] Italian, medium,  127k, webm_dash containervideo@   0k, opus @127k (48000Hz), 30.12MiB
251-4        webm       audio only  [de-DE] German (Germany), medium,  127k, webm_dash containervideo@   0k, opus @127k (48000Hz), 30.30MiB
251-5        webm       audio only  [pt-BR] Portuguese (Brazil), medium,  127k, webm_dash containervideo@   0k, opus @127k (48000Hz), 30.32MiB
140-0        m4a        audio only  [de-DE] German (Germany), medium,  129k, m4a_dash containervideo@   0k, mp4a.40.2@129k (44100Hz), 30.68MiB
140-1        m4a        audio only  [es-US] Spanish (United States), medium,  129k, m4a_dash containervideo@   0k, mp4a.40.2@129k (44100Hz), 30.68MiB
140-2        m4a        audio only  [fr-FR] French (France), medium,  129k, m4a_dash containervideo@   0k, mp4a.40.2@129k (44100Hz), 30.68MiB
140-3        m4a        audio only  [it] Italian, medium,  129k, m4a_dash containervideo@   0k, mp4a.40.2@129k (44100Hz), 30.68MiB
140-4        m4a        audio only  [pt-BR] Portuguese (Brazil), medium,  129k, m4a_dash containervideo@   0k, mp4a.40.2@129k (44100Hz), 30.68MiB
140-5        m4a        audio only  [en] medium,  129k, m4a_dash containervideo@   0k, mp4a.40.2@129k (44100Hz), 30.68MiB
600-1        webm       audio only  [en-US] English (United States) original (default), ultralow,   30k, webm_dash containervideo@   0k, opus @ 30k (48000Hz), 7.13MiB
599-1        m4a        audio only  [en-US] English (United States) original (default), ultralow,   30k, m4a_dash containervideo@   0k, mp4a.40.5@ 30k (22050Hz), 7.30MiB
249-6        webm       audio only  [en-US] English (United States) original (default), low,   45k, webm_dash containervideo@   0k, opus @ 45k (48000Hz), 10.73MiB
139-6        m4a        audio only  [en-US] English (United States) original (default), low,   48k, m4a_dash containervideo@   0k, mp4a.40.5@ 48k (22050Hz), 11.56MiB
250-6        webm       audio only  [en-US] English (United States) original (default), low,   59k, webm_dash containervideo@   0k, opus @ 59k (48000Hz), 14.08MiB
251-6        webm       audio only  [en-US] English (United States) original (default), medium,  119k, webm_dash containervideo@   0k, opus @119k (48000Hz), 28.40MiB
140-6        m4a        audio only  [en-US] English (United States) original (default), medium,  129k, m4a_dash containervideo@   0k, mp4a.40.2@129k (44100Hz), 30.68MiB

Going to https://<instance>/latest_version?id=m9Lz4v265tk&itag=140-0&local=true audio redirects to itag=18 video.
This is a bug and should not happen.

These new hyphenated formats are weird. The URLs for each of them don't resolve to their own separate hyphenated itags.
The final URL for the new formats all have the same itag.
Regardless of if you specify 140-1/2/3/4/5/6 the itag on the final googlevideo URL is always itag=140 – just with a different clen , dur and related values for the various languages.

I don't know of any way to query language specific audio on invidious. Please consider supporting hyphenated formats.
Unless this option already exists – in which case, do let me know.

Thanks!

[absidue]

This is not a bug report, the hyphenated values are a yt-dlp specific thing created by yt-dlp, they are not real itag values, so it is in no way surprising that they don't work on Invidious. Invidious searches for the itag and when it doesn't find it, because you passed it an invalid value, it redirects you to something that does actually exist so that you still get playback.

Also Invidious doesn't actually support multiple audio tracks yet, so this really is just a duplicate of the existing feature request. Additionally even when Invidious does support it, what you are doing still wouldn't work, as it would require Invidious to not only adopt support for invalid itag values but also to sort the audio streams in the exact same way as yt-dlp so that those arbitrarily assigned numbers would actually work, which seems extremely unlikely.

[unixfox]

duplicate of #2007

On top of the fact that you shouldn't use latest_version endpoint, it's only made for the frontend. use the API to fetch the URLs for downloading videos or audio.

[barkoder]

@absidue I didn't know that. Thanks!

@unixfox sorry for the dupe.