[tvthek.orf.at] DASH-formats only download the MPD-file

[hurda]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.04.01
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

>youtube-dl.exe -v -f dash-Q6A-Hoch "https://tvthek.orf.at/profile/Feierabend/13886374/FeierAbend-Aus-dem-Leben-einer-Haubenkoechin/14087728"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-f', 'dash-Q6A-Hoch', 'https://tvthek.orf.at/profile/Feierabend/13886374/FeierAbend-Aus-dem-Leben-einer-Haubenkoechin/14087728']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2021.04.01
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg 4.3.1, ffprobe N-73361-g03b2b40, rtmpdump 2.4
[debug] Proxy map: {}
[orf:tvthek] 14087728: Downloading webpage
[orf:tvthek] 14894657: Downloading m3u8 information
[orf:tvthek] 14894657: Downloading m3u8 information
[orf:tvthek] 14894657: Downloading m3u8 information
[orf:tvthek] 14894657: Downloading m3u8 information
[orf:tvthek] 14894657: Downloading m3u8 information
[orf:tvthek] 14894657: Downloading f4m manifest
[orf:tvthek] 14894657: Downloading f4m manifest
[orf:tvthek] 14894657: Downloading f4m manifest
[orf:tvthek] 14894657: Downloading f4m manifest
[orf:tvthek] 14894657: Downloading f4m manifest
[orf:tvthek] 14894657: Checking hls-Q1A-Niedrig-513 video format URL
[orf:tvthek] 14894657: Checking hls-Q4A-Mittel-1209 video format URL
[orf:tvthek] 14894657: Checking hls-Q6A-Hoch-2381 video format URL
[orf:tvthek] 14894657: Checking hls-Q8C-Sehr hoch-3812 video format URL
[orf:tvthek] 14894657: Checking hls-QXB-Adaptiv-992 video format URL
[orf:tvthek] 14894657: Checking hls-QXB-Adaptiv-1992 video format URL
[orf:tvthek] 14894657: Checking hls-QXB-Adaptiv-3192 video format URL
[orf:tvthek] 14894657: Checking hds-Q1A-Niedrig-429 video format URL
[orf:tvthek] 14894657: Checking hds-Q4A-Mittel-970 video format URL
[orf:tvthek] 14894657: Checking hds-Q6A-Hoch-1947 video format URL
[orf:tvthek] 14894657: Checking hds-Q8C-Sehr hoch-3120 video format URL
[orf:tvthek] 14894657: Checking hds-QXB-Adaptiv-548 video format URL
[orf:tvthek] 14894657: Checking hds-QXB-Adaptiv-968 video format URL
[orf:tvthek] 14894657: Checking hds-QXB-Adaptiv-1457 video format URL
[orf:tvthek] 14894657: Checking hds-QXB-Adaptiv-1945 video format URL
[orf:tvthek] 14894657: Checking hds-QXB-Adaptiv-2531 video format URL
[orf:tvthek] 14894657: Checking hds-QXB-Adaptiv-3117 video format URL
[orf:tvthek] 14894657: Checking dash-Q1A-Niedrig video format URL
[orf:tvthek] 14894657: Checking dash-Q4A-Mittel video format URL
[orf:tvthek] 14894657: Checking dash-Q6A-Hoch video format URL
[orf:tvthek] 14894657: Checking dash-Q8C-Sehr hoch video format URL
[orf:tvthek] 14894657: Checking dash-QXB-Adaptiv video format URL
[download] Downloading playlist: 14087728
[orf:tvthek] playlist 14087728: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[debug] Invoking downloader on 'https://apasfiis.sf.apa.at/dash/cms-worldwide/2021-04-05_1952_sd_02_FeierAbend--Aus_____14087728__o__4943220446__s14894657_7__BCK2HD_19515908P_20005902P_Q6A.mp4/manifest.mpd'
[download] Destination: FeierAbend - Aus dem Leben einer Haubenköchin-14894657.mpd
[download] 100% of 3.53KiB in 00:00
[download] Finished downloading playlist: 14087728

Description

Trying to download videos in any of the DASH-qualities results in just the tiny MPD-file being downloaded instead of the video, see above in the log: [download] 100% of 3.53KiB in 00:00
Downloading any of the HLS- or HDS-variants works fine.