Cannot download the best quality format of a particular file extension with -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]'

[springsin0]

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Description of your issue, suggested solution and other information

I want to download this file "https://www.youtube.com/watch?v=-Ng9hpqFlm89hpq", and it has these formats.

youtube-dl --proxy "http://localhost:3715" -F https://www.youtube.com/watch?v=-Ng9hpqFlm89hpq
[youtube] -Ng9hpqFlm8: Downloading webpage
[youtube] -Ng9hpqFlm8: Downloading video info webpage
[youtube] -Ng9hpqFlm8: Extracting video information
[youtube] -Ng9hpqFlm8: Downloading MPD manifest
[info] Available formats for -Ng9hpqFlm8:
format code  extension  resolution note
249          webm       audio only DASH audio   50k , opus @ 50k, 36.88KiB
250          webm       audio only DASH audio   58k , opus @ 70k, 43.25KiB
171          webm       audio only DASH audio  103k , vorbis@128k, 75.71KiB
251          webm       audio only DASH audio  107k , opus @160k, 79.32KiB
140          m4a        audio only DASH audio  128k , m4a_dash container, mp4a.4
0.2@128k (44100Hz)
278          webm       256x144    144p   91k , webm container, vp9, 30fps, vide
o only, 66.58KiB
160          mp4        256x144    DASH video  112k , avc1.4d400c, 30fps, video
only
242          webm       426x240    240p  112k , vp9, 30fps, video only, 82.35KiB

243          webm       640x360    360p  219k , vp9, 30fps, video only, 160.28Ki
B
134          mp4        640x360    DASH video  237k , avc1.4d401e, 30fps, video
only
133          mp4        426x240    DASH video  246k , avc1.4d4015, 30fps, video
only
244          webm       854x480    480p  373k , vp9, 30fps, video only, 272.60Ki
B
135          mp4        854x480    DASH video  505k , avc1.4d401f, 30fps, video
only
247          webm       1280x720   720p  843k , vp9, 30fps, video only, 615.20Ki
B
136          mp4        1280x720   DASH video 1157k , avc1.4d401f, 30fps, video
only
137          mp4        1920x1080  DASH video 2247k , avc1.640028, 30fps, video
only
248          webm       1920x1080  1080p 2316k , vp9, 30fps, video only, 1.65MiB

17           3gp        176x144    small , mp4v.20.3,  mp4a.40.2@ 24k
36           3gp        320x180    small , mp4v.20.3,  mp4a.40.2
43           webm       640x360    medium , vp8.0,  vorbis@128k
18           mp4        640x360    medium , avc1.42001E,  mp4a.40.2@ 96k
22           mp4        1280x720   hd720 , avc1.64001F,  mp4a.40.2@192k (best)

The following command with -f 137+140 works well.

youtube-dl --proxy "http://localhost:3715" -f 137+140 https://www.youtube.com/watch?v=-Ng9hpqFlm8
[youtube] -Ng9hpqFlm8: Downloading webpage
[youtube] -Ng9hpqFlm8: Downloading video info webpage
[youtube] -Ng9hpqFlm8: Extracting video information
[youtube] -Ng9hpqFlm8: Downloading MPD manifest
[dashsegments] Total fragments: 3
[download] Destination: 乃木坂46「齋藤飛鳥_クリエイターパソコン」篇　6秒 _ マウ
スコンピューター--Ng9hpqFlm8.f137.mp4
[download] 100% of 1.39MiB in 00:11
[dashsegments] Total fragments: 2
[download] Destination: 乃木坂46「齋藤飛鳥_クリエイターパソコン」篇　6秒 _ マウ
スコンピューター--Ng9hpqFlm8.f140.m4a
[download] 100% of 94.94KiB in 00:05
[ffmpeg] Merging formats into "乃木坂46「齋藤飛鳥_クリエイターパソコン」篇　6秒
_ マウスコンピューター--Ng9hpqFlm8.mp4"
Deleting original file 乃木坂46「齋藤飛鳥_クリエイターパソコン」篇　6秒 _ マウス
コンピューター--Ng9hpqFlm8.f137.mp4 (pass -k to keep)
Deleting original file 乃木坂46「齋藤飛鳥_クリエイターパソコン」篇　6秒 _ マウス
コンピューター--Ng9hpqFlm8.f140.m4a (pass -k to keep)

But with -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]' cannot correctly download the file, it prompts ERROR: requested format not available.

youtube-dl --proxy "http://localhost:3715" -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]' https://www.youtube.com/watch?v=-Ng9hpqFlm8 -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--proxy', 'http://localhost:3715', '-f', "'bestvide
o[ext=mp4]+bestaudio[ext=m4a]'", 'https://www.youtube.com/watch?v=-Ng9hpqFlm8',
'-v']
[debug] Encodings: locale cp936, fs mbcs, out cp936, pref cp936
[debug] youtube-dl version 2017.02.04.1
[debug] Python version 3.4.4 - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg N-83195-ge371f03, ffprobe N-83195-ge371f03
[debug] Proxy map: {'http': 'http://localhost:3715', 'https': 'http://localhost:
3715'}
[youtube] -Ng9hpqFlm8: Downloading webpage
[youtube] -Ng9hpqFlm8: Downloading video info webpage
[youtube] -Ng9hpqFlm8: Extracting video information
[youtube] -Ng9hpqFlm8: Downloading MPD manifest
ERROR: requested format not available
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpwby3zsth\bu
ild\youtube_dl\YoutubeDL.py", line 707, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpwby3zsth\bu
ild\youtube_dl\YoutubeDL.py", line 753, in process_ie_result
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmpwby3zsth\bu
ild\youtube_dl\YoutubeDL.py", line 1432, in process_video_result
youtube_dl.utils.ExtractorError: requested format not available

[yan12125]

IIRC you need to use double quotes on Windows

[springsin0]

@yan12125 Thank you. It worked. With double quotes or no quotes.