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Old 05.10.2018, 10:47
davis89 davis89 is offline
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Default Not full potential of downloading speed

So I'm not sure how to describe it, but I will try my best.

My device specification maybe could play a role so maybe I will mention it here.
I'm using JDownloader on my Yoga 2 tablet with 2GB RAM, Windows 8.1, 8GB internal memory free, microsd card slot is quite slow(I think usually 5-10MB/s) while copy files etc.

So I've started to download some youtube playlist and channels as an m4a audio and although I usually should have 1-2MB/sec by my LTE sim card inserted in tablet and that the speed I download files with browser, in JDownloader the speed is around 200-800KB for 1-3 seconds at the beginning of downloading and quickly decreasing to ~<50KB

I was thinking that maybe the reason could be my device specs, but it seems
it's happening regardless of settings of how many files are downloading at one time and on how many parts.

When I'm downloading torrents the speed also is normal.

I remember that sometimes I got 50KB when downloading by browser many youtube videos and it was happening when I was downloading many files at the same time(not so many, that the sum of the speed would be the maximum speed).

I was also thinking that maybe it's my mobile net provider?
But then, while I'm having this 50KB in JDownloader, should it be the same in browser(while when I test it, in browser it's full speed)?
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  #2  
Old 05.10.2018, 11:10
mgpai mgpai is offline
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Quote:
Originally Posted by Jiaz View Post
Depending on the video format, Youtube limits download speed to match required bitrate of video/audio.
You can bypass in Settings-Advanced Settings-Youtube.ratebypassenabled
Post#386011
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  #3  
Old 05.10.2018, 14:28
davis89 davis89 is offline
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The issue still occurs the same.

It only occurs for the audio(only 128Kb m4a tested) and the 50KB/s is the exact speed I have also when downloading audio by browser not straight from the source but when using some third party website that download already mp3.
Shouldn't/isn't JDownloader downloading audio straight from the source?

Last edited by davis89; 05.10.2018 at 14:52.
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Old 05.10.2018, 14:35
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Jiaz Jiaz is offline
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Does it only affect YT downloads or all other. In case it affects all downloads, it's very likely be caused by throttling by your ISP
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Old 05.10.2018, 15:51
davis89 davis89 is offline
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It's only for youtube.

By the way, is anywhere explained how the youtube plugin works, as I've asked before - when he downloads audio in most common format now (128KB m4a) is it downloading straight from the youtube?
And why when JDownloader finishes the downloading he needs to convert the file?
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  #6  
Old 05.10.2018, 16:12
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Videos are offered in three different formats
1.) Audio/Video in one file, eg mp4, Resume/Chunks supported
2.) DASH, Audio/Video are seperated, Resume/Chunks supported, requires postprocessing to merge Audio/Video back into one file
3.) HLS, Video is split in many many small parts/chunks, Resume/Chunks is NOT supported, might require postprocessing to merge multiple parts back into one file

JDownloader does only download and there is no converting taking place.

YT limits the downloadspeed to match the required bitrate of the video and that would explain the slow download speed. So either you haven't enabled https://board.jdownloader.org/showpo...52&postcount=2 or YT has disabled this or the video is provided as format 3. Also your ISP might throttle the speed to match the bitrate
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Old 05.10.2018, 16:44
davis89 davis89 is offline
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Using the occasion I wanted just to say Huge Thanks Jiaz for so detailed explanation and also in general for the work you do.
Thank you for making and sustaining this program and also responding so nicely to people in community.

You are my hero! All the best for you and the team.
Thanks
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  #8  
Old 05.10.2018, 17:07
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Nothing to thank me for. Just answered your questions
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  #9  
Old 05.10.2018, 20:58
mgpai mgpai is offline
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@davis89: Does not appear to be HLS. Try increasing the number of chunks. I got ~ 50 KiB/s with 1 chunk, but could download the same file with ~ 1 MiB/s with 20 chunks.
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Old 05.10.2018, 21:05
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@mgpai: bypass didn't work?
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  #11  
Old 05.10.2018, 21:11
mgpai mgpai is offline
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Quote:
Originally Posted by Jiaz View Post
@mgpai: bypass didn't work?
Bypass enabled, but does not seem to have any effect (at least in this case).
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  #12  
Old 05.10.2018, 21:13
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@mgpai: can you send me example link by mail?
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Old 05.10.2018, 21:23
mgpai mgpai is offline
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@Jiaz: Sent
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  #14  
Old 06.10.2018, 05:25
davis89 davis89 is offline
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Ok, I've tested it again today and it seems the same happens in the browser(speed reduce to 50KB quickly from my max 1MB). It's only for youtube, other files are downloading normal speed.

Changing numer of chunks for example to 10 did only slowed the proces of decreasing the speed from few seconds to maybe 20.

I have bypass option on.

Last edited by davis89; 06.10.2018 at 05:29.
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  #15  
Old 06.10.2018, 08:13
mgpai mgpai is offline
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@davis89: Existing downloads continue to download with old chunk setting, unless the are reset. Check the "connections" column to find the number of chunks being used to download the file.

Post example link and your log here so that Jiaz can check it.
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  #16  
Old 06.10.2018, 18:46
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Will check on monday. It may be caused by changes of YT or the removal of the bypass or ISP caching server caused. Increasing connections won't help because each connection still will be throttled/limitied to actual required bitrate
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  #17  
Old 06.10.2018, 19:31
mgpai mgpai is offline
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Quote:
Originally Posted by Jiaz View Post
Increasing connections won't help because each connection still will be throttled/limitied to actual required bitrate
These are the download speeds with 2 different settings for the link which I emailed you yesterday.

Last edited by Jiaz; 06.10.2018 at 19:42.
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  #18  
Old 06.10.2018, 19:42
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Yes, but it shouldn't require multiple connections and bypass should work for one
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  #19  
Old 06.10.2018, 19:46
mgpai mgpai is offline
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OK. How come the images were deleted? Did I post any objectionable content? Better to have clear guidelines on what we can and cannot post.
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  #20  
Old 06.10.2018, 19:49
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Will explain via chat next week, okay?
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