[Tools-discuss] Re: Session audio recording

[Eric Rescorla <[e-mail]>]

On Thu, Nov 6, 2025 at 9:08 AM Robert Sparks <[e-mail]> wrote:

> We are storing the bits.
>
> We are using YouTube and Cloudflare Stream to make them available
> (there's a toggle on the meetecho player to use Cloudflare Stream now,
> and before 125, we'll have the Cloudflare stream urls in the datatracker
> along with the Youtube ones).
>
> The options we have for making the bits available for _download_ from
> our copies are changing. I'll be looking into whether that's something
> we can do, and whether we can make, e.g., audio only downloads available
> as well.
>

Thanks. That would be great. I would be fine with downloading video
and just processing the audio, but obviously it would be cheaper for
IETF to provide audio only.

-Ekr




> RjS
>
> On 11/6/25 11:53 AM, Lorenzo Miniero wrote:
> > On Thu, 6 Nov 2025 08:36:15 -0800
> > Rob Sayre <[e-mail]> wrote:
> >
> >> Well it makes sense, sort of. Even though hosting the files would not
> >> be expensive, someone has to take care of it, and it is a different
> >> task than writing Python and HTML while dealing with IETF details. I
> >> think it would be easy to put them on S3 or equivalent (Cloudflare,
> >> etc have competitors and the API is open, so the AWS tools work with
> >> most of them). That would create an ever-increasing bill as we add
> >> recordings.
> >>
> >> In the meantime, it occurred to me that Ekr can use the "youtube-dl"
> >> tool to make this work right now.
> >>
> >> https://github.com/ytdl-org/youtube-dl/blob/master/README.md#readme
> >>
> >> -x, --extract-audio          Convert video files to audio-only files
> >>                                       (requires ffmpeg/avconv and
> >>                                       ffprobe/avprobe)
> >>
> >
> > Yes, I thought about tools like youtube-dl (or yt-dlp) too, but -x
> > would not be what I'd go to if you want to save the download bandwidth.
> > Those tools have a --list-formats option that allows you to list which
> > options are available for download, and some of them will be audio- or
> > video-only. For instance, from a check I made with a TLS recording from
> > IETF 124:
> >
> >       yt-dlp -F "https://yewtu.be/watch?v=zTAuEx9Otys"
> >
> > formats 233 and 234 look like audio-only available options, meaning
> > that they can be picked selectively:
> >
> >       yt-dlp -f 233 "https://yewtu.be/watch?v=zTAuEx9Otys"
> >
> > In this case, this only downloads 25MB (mp4 file with AAC codec).
> >
> > Lorenzo
> >
> >
> >> thanks,
> >> Rob
> >>
> >> On Thu, Nov 6, 2025 at 7:49 AM Tom Pusateri <[e-mail]>
> >> wrote:
> >>
> >>> I have discussed this in the past for use with the mobile apps.
> >>>
> >>> I had asked for all the individual raw files be archived for audio
> >>> and video but this request was rejected. The problem seemed to be
> >>> that the IETF didn’t want to provide the storage for this. So they
> >>> generate a file to upload to YouTube and delete the originals.
> >>>
> >>> I wanted to play around with different ways to present the audio
> >>> and video through the mobile apps such that you could have just
> >>> audio and have it play in the background while driving or on a
> >>> walk. Or switch between video and high quality synchronized slides.
> >>>
> >>> I also experimented with speech to text systems and speaker
> >>> identification algorithms. But without a reliable source of the
> >>> audio files, I lost interest in the project.
> >>>
> >>> Tom
> >>>
> >>>
> >>>> On Nov 5, 2025, at 11:05 PM, Rob Sayre <[e-mail]> wrote:
> >>>>
> >>>> Oh, some of them do have .m3u but I am not sure how that works.
> >>>> Maybe
> >>> just a few paragraphs of documentation, since the feature already
> >>> seems to be there  (but only sometimes? idk). How do we get the
> >>> headphones link there?
> >>>> thanks,
> >>>> Rob
> >>>>
> >>>> (not unaware that I am sending "how do I get the headphones
> >>>> button?" to
> >>> an IETF list)
> >>>>
> >>>> <Screenshot 2025-11-05 at 8.02.10 PM.png>
> >>>>
> >>>>
> >>>>
> >>>> On Wed, Nov 5, 2025 at 2:50 PM Eric Rescorla <[e-mail]> wrote:
> >>>>
> >>>>
> >>>> On Wed, Nov 5, 2025 at 2:46 PM Watson Ladd
> >>>> <[e-mail]>
> >>> wrote:
> >>>>
> >>>> On Wed, Nov 5, 2025, 2:38 PM Eric Rescorla <[e-mail]> wrote:
> >>>>
> >>>>
> >>>> On Wed, Nov 5, 2025 at 2:32 PM Rob Sayre <[e-mail]> wrote:
> >>>>
> >>>>
> >>>> On 11/5/25 1:02 PM, Eric Rescorla wrote:
> >>>>> Is there a straightforward way to just get the audio recording
> >>>>> for a given session?
> >>>>>
> >>>> Hi,
> >>>>
> >>>> It's a fair question--sometimes they have had links for that from
> >>>> MeetEcho, but this time around it seems like there are no mp3
> >>>> files, only YouTube and Cloudflare video (which confusingly looks
> >>>> like SoundCloud?).
> >>>>
> >>>>
> >>>> These should be on BitTorrent, but in practice it doesn't matter.
> >>>> YouTube works fine and the video overhead isn't too bad because
> >>>> it's just slides that don't really change most of the time over
> >>>> each frame, and you need to show the "Note Well" without wasting
> >>>> everyone's time by reading it out.
> >>>>
> >>>> What I'm looking to do here is not to avoid the bandwidth
> >>>> associated with the video but to be able to download the audio so
> >>>> I can feed it into a speech to text model.
> >>>>
> >>>> The model can also give you the baroque (is there any other kind)
> >>>> of
> >>> ffmpeg invocation to strip out just the audio.
> >>>> Indeed it could, if the video were available for download at some
> >>>>
> >>> official URL.
> >>>> -Ekr
> >>>>
> >>>>
> >>>> -Ekr
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> >>>
> >>>
> >
> >
>
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