Pointing to a specific file. Code request

[avagraha]

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Question

Hi. Until the word DO all is right , after it is catastrophic. What have i to write after DO to tell:
Ignore the fake q5.mp4 and download the real q8.mp4 only?
I already know that it is not easy, surely possible but not easy. Thanks for a working string before closing the topic.
FOR /F "delims=" %A IN ('xidel.exe -s 
"https://tvthek.orf.at/profile/Archiv/7648449/Neues-beim-Wiener-Sommernachtskonzert/13919349/Neues-beim-Wiener-Sommernachtskonzert/13995118" 
 -e "//div[@Class='jsb_ 
jsb_VideoPlaylist']/json(@data-jsb)/selected_video/(sources)()[delivery='hls' 
and quality='Q8C']/src"') DO @youtube-dl.exe --user-agent "" -i "%A" 
merged_Q8_output.mp4

[avagraha]

Before asking I filled in all the forms provided by this site. Therefore the question is difficult not incomplete.