Problem report
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Richelo Killian
Oct 27, 2022, 1:20:41 AM10/27/22
to Video DownloadHelper Q&A
The name & release of your operating system
- macOS Ventura 13.0
The name & release of your web browser
- FireFox 106.0.1The release number of your VDH & whether you have a license
- 7.6.0. I do have a license
The release number of your CoAp
I download the 1280 x 720 version.
The video plays perfectly in the browser. The downloaded video however is skipping, has bad audio, and is missing the slides.
mjs
Oct 27, 2022, 2:18:40 AM10/27/22
to Video DownloadHelper Q&A
I think you're referring to the too fast video problem. I tried them all in VDH and all the same result, video speeds by very quickly then you're left
with just the audio. There are a few different methods which could be used to get your video but only one works which involves opening the Developer Tools. Refer to this network method here :
--
A vdh user
Wild Willy
Oct 27, 2022, 2:38:33 AM10/27/22
to Video Download Helper Google Group
You beat me to it. I was testing whether things would work. You can take the easy way
out & use the MP4s you can find in the Network Monitor. You can also find m3u8 HLS
manifests in the one HTML document as we have both described in that other thread. Using
one of those manifests will require you to learn ffmpeg. There is a reference to the
ffmpeg tutorial in the other thread. If you do learn how to use ffmpeg, you will be able
to download the captions for this. Unlike in several other recent similar problems, the
captions here actually seem to be correct. My sampling of what I downloaded seemed to
show that the captions really did show what the people were saying in the video. But the
bottom line here is that this is a perfect duplicate of the problem we solve over in that
other thread mjs mentioned.
out & use the MP4s you can find in the Network Monitor. You can also find m3u8 HLS
manifests in the one HTML document as we have both described in that other thread. Using
one of those manifests will require you to learn ffmpeg. There is a reference to the
ffmpeg tutorial in the other thread. If you do learn how to use ffmpeg, you will be able
to download the captions for this. Unlike in several other recent similar problems, the
captions here actually seem to be correct. My sampling of what I downloaded seemed to
show that the captions really did show what the people were saying in the video. But the
bottom line here is that this is a perfect duplicate of the problem we solve over in that
other thread mjs mentioned.
mjs
Oct 27, 2022, 2:53:54 AM10/27/22
to Video DownloadHelper Q&A
Are you saying you downloaded some captions from one of those manifests because I couldn't get any of the manifests to work.
They were giving a 403 error forbidden.
Wild Willy
Oct 27, 2022, 4:26:05 AM10/27/22
to Video Download Helper Google Group
There's 7 m3u8 URLs mentioned in that weird file (which I got with Copy Response). But
it looked to me like there were really only 4 unique URLs there with the other 3
duplicating others. I ran all 4 through ffprobe & they all showed the same collection of
Streams. There were several video Streams of various resolutions but just a single audio
Stream in each manifest. The ffprobe invocations also gave the usual complaint about
being unable to interpret the captions. But we know that's bogus. If you take the
partial URL in the error message & prefix it with the front part of the other manifest
URLs listed by ffprobe, you get another manifest URL. Pump that through ffprobe & it
tells you it's a manifest for vtt. So run ffmpeg against that URL. It's not presenting
a simple vtt file. It's presenting the vtt as another stream via a manifest.
I have found on a few sites that you'll get 404 Not Found or 403 Forbidden on a manifest.
But all you need to do is reload the page. It generates a new manifest & that one will
work. It's all about the gibberish part of the URL. Part of it ties the video to your
browser session, & another part of it expresses some kind of timeout. The connection
between what you see in the URLs & the session ID/timeout interval is not obvious.
Actually, it's a total mystery, which is probably intentional. But it's there.
Sometimes. Of course, no two sites are alike. Why would they be? We have to have some
sort of complication to keep us busy.
it looked to me like there were really only 4 unique URLs there with the other 3
duplicating others. I ran all 4 through ffprobe & they all showed the same collection of
Streams. There were several video Streams of various resolutions but just a single audio
Stream in each manifest. The ffprobe invocations also gave the usual complaint about
being unable to interpret the captions. But we know that's bogus. If you take the
partial URL in the error message & prefix it with the front part of the other manifest
URLs listed by ffprobe, you get another manifest URL. Pump that through ffprobe & it
tells you it's a manifest for vtt. So run ffmpeg against that URL. It's not presenting
a simple vtt file. It's presenting the vtt as another stream via a manifest.
I have found on a few sites that you'll get 404 Not Found or 403 Forbidden on a manifest.
But all you need to do is reload the page. It generates a new manifest & that one will
work. It's all about the gibberish part of the URL. Part of it ties the video to your
browser session, & another part of it expresses some kind of timeout. The connection
between what you see in the URLs & the session ID/timeout interval is not obvious.
Actually, it's a total mystery, which is probably intentional. But it's there.
Sometimes. Of course, no two sites are alike. Why would they be? We have to have some
sort of complication to keep us busy.
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