Typically youtube-dl aims to shoot for the highest quality possible. That's not always practical. Flip side I've seen was for minimum quality possible. That's not practical either. What would be a command to make youtube-dl find the highest quality format that is within a set limit?
Say: having resolution width equal to or below a certain value. See this example for available formats for a given video link:
youtube -F
...
format code extension resolution note
2242414685833597ad m4a audio only DASH audio 21k , m4a_dash container, mp4a.40.2 (48000Hz)
572715713158985v mp4 426x240 DASH video 216k , mp4_dash container, avc1.4D401E, video only
110928776481884vd mp4 640x360 DASH video 420k , mp4_dash container, avc1.4D401E, video only
896314927220784v mp4 854x480 DASH video 738k , mp4_dash container, avc1.4D401E, video only
313835759204486v mp4 1280x720 DASH video 1372k , mp4_dash container, avc1.4D401F, video only
dash_sd_src mp4 unknown
dash_sd_src_no_ratelimit mp4 unknown (best)
I want to tell youtube-dl to choose the highest quality video stream whose width does not exceed 640 pixels. That would be the 110928776481884vd in this case.
If its not possible to do with resolution width, we could do with bitrate. So in this same example, bitrate should be 500k or lower.
Note: This question is specifically for non-youtube videos from different providers having different kinds of formats. The youtube ones have standard format names so I've already fixed for that.
Answer
Read the fine manual:
Format selection examples
Note that on Windows you may need to use double quotes instead of sin‐
gle.
# Download best mp4 format available or any other best if no mp4 available
$ youtube-dl -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best'
# Download best format available but not better that 480p
$ youtube-dl -f 'bestvideo[height<=480]+bestaudio/best[height<=480]'
# Download best video only format but no bigger than 50 MB
$ youtube-dl -f 'best[filesize<50M]'
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