[Tools-discuss] Re: Session audio recording

[Robert Sparks <[e-mail]>]

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.

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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>>>
>>>   
>
>