Multiple connection support in internal dash downloader

[TehBotolSosro]

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

C:\Video>youtube-dl --external-downloader axel http://genflix.orangetv.asia.swiftserve.com/US/videoContent-1530-iqn62l7c-v1/videoContent-1530-iqn62l7c-m1-4-NoneUS/1487-1530-m1-iqn62l7c-default.ism/a.mpd -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--external-downloader', 'axel', 'http://genflix.orangetv.asia.swiftserve.com/US/videoContent-1530-iqn62l7c-v1/videoContent-1530-iqn62l7c-m1-4-NoneUS/1487-1530-m1-iqn62l7c-default.ism/a.mpd', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2016.10.26
[debug] Python version 3.4.4 - Windows-10-10.0.10240
[debug] exe versions: ffmpeg N-82117-gc117343, ffprobe N-82117-gc117343, rtmpdump 2.3
[debug] Proxy map: {}
[generic] a: Requesting header
WARNING: Falling back on generic information extractor.
[generic] a: Downloading webpage
[generic] a: Extracting information
[debug] Invoking downloader on 'http://genflix.orangetv.asia.swiftserve.com/US/videoContent-1530-iqn62l7c-v1/videoContent-1530-iqn62l7c-m1-4-NoneUS/1487-1530-m1-iqn62l7c-default.ism/dash/'
[dashsegments] Total fragments: 3222

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=BaW_jenozKc
• Single video: https://youtu.be/BaW_jenozKc
• Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

https://bitdash-a.akamaihd.net/content/sintel/sintel.mpd
http://genflix.orangetv.asia.swiftserve.com/US/videoContent-1633-istumdrs-v1/videoContent-1633-istumdrs-m1-4-NoneUS/1584-1633-m1-istumdrs-default.ism/a.mpd

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Please add support for multiple connection / thread when downloading mpd video stream as sometime using youtube-dl to download it can be slow even when you have high internet speed, example when downloading from the second example above i mostly only get 20 - 200 KB/sec

as youtube-dl seem to ignore the --external-downloader when downloading mpd file

[TehBotolSosro]

will you be working on this yan12125?

i think enabling the external downloader for the mpd dash will be enough, as i just tried with with creating the fragment link manually and download them using and rename all the dash file to the youtube-dl format so youtube-dl recognize the stream as already downloaded and simply merge them all together and the video run fine

now hopefully youtube-dl support CENC mpd in the future since the key can be easily retrieved, since most of the site now are using DRM encryption (Widevine,Marlin,PlayReady)

thanks again

[yan12125]

CENC is out of scope of this issue. See #1753 (comment). The most difficult part is that CENC requires dynamically loading of C++ modules, which is tricky in terms of portability. youtube-dl needs to support at least Windows, Linux and Mac.

For non-encrypted streams: I don't use download helpers, and as you've said there are workarounds for this feature, so I don't put it to the highest priority.

[Gaploid]

Hi Guys, Can you point me how to use "workarounds" to download Dash video files for example from Twitch using multi-connections or maybe that feature is already in development? It seems it's really slow to download twitch past broadcasts that are stored as m3u8. I`ve tried to use external downloader but youtube-dl fallback to hlsnative. Sometimes speed is only 2.5Mib on 1Gb internet channel.