[KakaoTV] Downloads ad video

henryjmin commented 1 year ago

Checklist

[x] I'm reporting a broken site support
[x] I've verified that I'm running youtube-dl version 2021.12.17
[x] I've checked that all provided URLs are alive and playable in a browser
[x] I've checked that all URLs and arguments with special characters are properly quoted or escaped
[x] I've searched the bugtracker for similar issues including closed ones

Verbose log

> youtube-dl --verbose https://tv.kakao.com/channel/3152511/cliplink/432327649

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://tv.kakao.com/channel/3152511/cliplink/432327649']
[debug] Encodings: locale cp949, fs mbcs, out cp949, pref cp949
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg 5.0.1-full_build-www.gyan.dev, ffprobe 5.0.1-full_build-www.gyan.dev
[debug] Proxy map: {}
[Kakao] 432327649: Downloading video info
[Kakao] 432327649: Downloading video URL for profile LOW
[Kakao] 432327649: Downloading video URL for profile BASE
[Kakao] 432327649: Downloading video URL for profile MAIN
[Kakao] 432327649: Downloading video URL for profile HIGH
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'http://vsak1.play.kakao.com/vod/ve0d4t74G2k7HVK7GB4t4H7/mp4/mp4_720P_2M_T1/clip.mp4?px-time=1679423593&px-bps=5920000&px-bufahead=31&px-hash=8b4670b43e541acd8f46bd0ecdb096e9'
[download] Destination: [카카오TV] 광고 영상_150624-432327649.mp4
[download] 100% of 3.12MiB in 00:00

Description

When I try to download a Kakao TV video, the advertisement video is downloaded instead of the video I want.

dirkf commented 1 year ago

Sure looks like an ad: http://vsak1.play.kakao.com/vod/ve0d4t74G2k7HVK7GB4t4H7/mp4/mp4_240P_200K_T1/clip.mp4?px-time=1679428992&px-bps=526428&px-bufahead=249&px-hash=04233b12a701ae785227077623985c12

Could you get the media URL of the actual target video for comparison, using browser devtools?

october262 commented 1 year ago

try it with this link - "https://tv.kakao.com/embed/player/cliplink/432327649?service=kakao_tv&section=channel&autoplay=1&profile=HIGH&wmode=transparent" the video will download & play but it might be DRM protected

dirkf commented 1 year ago

Tracing the link above (no DRM) shows these requests in particular:

https://play-tv.kakao.com/katz/v1/close/cliplink/432327649/info (with the target URL in the Referer header): {"vid":"rvbsmxiwvfuhflibaclegdvyn","canScrap":true,"clipId":338893481}
https://kamp.kakao.com/vod/v1/src/rvbsmxiwvfuhflibaclegdvyn?tid=4cdb701e88c926e9b49e6b49ad512537&param_auth=true&1679619955169: JSON includes all the media streams.

In principle, (1) gives us the vid for the video; then (2) uses the the vid to get the streams. But for (2) we need a JWT Bearer token that is not obviously seen in previous exchanges: it may be found in one of the JS files that were loaded, or it may be generated from other parameters by some JS. Possibly it's a fixed value (for some period) so that a sniffed token could be used as a constant in the extractor. If tid also turns out to be required, another request seems to have the value: https://tv.kakao.com/katz/v4/ft/cliplink/432327649/readyNplay?player=monet_html5&referer=&pageReferer=&uuid=a6ce4ba02e6d5b047c8601641cf23bf9&profile=HIGH&service=kakao_tv&section=channel&fields=seekUrl,abrVideoLocationList&playerVersion=3.14.8&appVersion=91.0&startPosition=0&tid=&dteType=PC&continuousPlay=false&autoPlay=false&contentType=&drmType=widevine&ab=&literalList=&1679618929478.

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Watch

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