[Bug] --exec doesn't work on Windows because of single quotes

[Reino17]

• I've verified and I assure that I'm running youtube-dl 2016.12.20
• I've at least skimmed through README and most notably FAQ and BUGS sections
• I've searched the bugtracker for similar issues including closed ones

The purpose of my issue is:

• Bug report (encountered problems with youtube-dl)

---

youtube-dl.exe -vf 18 https://www.youtube.com/watch?v=QgQ-D6bvc1A --exec "ffmpeg -hide_banner
-i {} -c copy -bsf:v h264_mp4toannexb {}.new.ts"
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-vf', '18', 'https://www.youtube.com/watch?v=QgQ-D6bvc1A', '--ex
ec', 'ffmpeg -hide_banner -i {} -c copy -bsf:v h264_mp4toannexb {}.new.ts']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2016.12.20
[debug] Python version 3.4.4 - Windows-XP-5.1.2600-SP3
[debug] exe versions: ffmpeg N-82759-g1f5630a-Sherpya
[debug] Proxy map: {}
[youtube] QgQ-D6bvc1A: Downloading webpage
[youtube] QgQ-D6bvc1A: Downloading video info webpage
[youtube] QgQ-D6bvc1A: Extracting video information
[youtube] QgQ-D6bvc1A: Downloading MPD manifest
[debug] Invoking downloader on 'https://r4---sn-mn4vg5aa-5hns.googlevideo.com/videoplayback?g
ir=yes&itag=18&mn=sn-mn4vg5aa-5hns&signature=4EA90C7BB341BD1B8A800EB25004E3ACAD6478AA.8CF354B
272571A796E82824968C48EFC33EBBB31&key=yt6&ms=au&mv=m&mt=1482271060&dur=89.698&ei=7KlZWOO0I8Ok
1gLl3JXwCA&lmt=1482229941216632&ip=2001%3A980%3A2408%3A1%3Ad66%3Aade4%3A3e76%3Adcf5&expire=14
82292812&id=o-AEXaZmy0b4iQS8upDLzMfyiLoQVHFYYF8L0_HWVfq6TU&upn=MS76gPkPaw4&initcwndbps=251000
0&source=youtube&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%
2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&pl=35&mm=31
&ratebypass=yes&requiressl=yes&ipbits=0&mime=video%2Fmp4&clen=5668603'
[download] Amsterdam - Gewelddadige beroving toerist-QgQ-D6bvc1A.mp4 has already been downloa
ded
[download] 100% of 5.41MiB
[exec] Executing command: ffmpeg -hide_banner -i 'Amsterdam - Gewelddadige beroving toerist-Q
gQ-D6bvc1A.mp4' -c copy -bsf:v h264_mp4toannexb 'Amsterdam - Gewelddadige beroving toerist-Qg
Q-D6bvc1A.mp4'.new.ts
'Amsterdam: No such file or directory
ERROR: Command returned error code 1
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmph8curlv3\build\youtube_d
l\YoutubeDL.py", line 1837, in post_process
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmph8curlv3\build\youtube_d
l\postprocessor\execafterdownload.py", line 26, in run
youtube_dl.utils.PostProcessingError: Command returned error code 1

---

--exec "ffmpeg -hide_banner -i {} -c copy -bsf:v h264_mp4toannexb {}.new.ts"
expands to
[exec] Executing command: ffmpeg -hide_banner -i 'Amsterdam - Gewelddadige beroving toerist-QgQ-D6bvc1A.mp4' -c copy -bsf:v h264_mp4toannexb 'Amsterdam - Gewelddadige beroving toerist-QgQ-D6bvc1A.mp4'.new.ts

Or in other words: {} expands to '{}'. This is bad for 2 reasons:

1. Single quotes won't work in Windows. Hence the 'Amsterdam: No such file or directory-error.
2. The suffix .new.ts is ignored.

No problem at all doing this manually:

ffmpeg -hide_banner -i "Amsterdam - Gewelddadige beroving toerist-QgQ-D6bvc1A.mp4" -c copy -b
sf:v h264_mp4toannexb "Amsterdam - Gewelddadige beroving toerist-QgQ-D6bvc1A.new.ts"
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Amsterdam - Gewelddadige beroving toerist-QgQ-D6bvc1
A.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2016-12-20T10:32:18.000000Z
  Duration: 00:01:29.70, start: 0.000000, bitrate: 505 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x36
0 [SAR 1:1 DAR 16:9], 407 kb/s, 24.89 fps, 25 tbr, 25 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (d
efault)
    Metadata:
      creation_time   : 2016-12-20T10:32:18.000000Z
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Output #0, mpegts, to 'Amsterdam - Gewelddadige beroving toerist-QgQ-D6bvc1A.new.ts':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf57.58.101
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x36
0 [SAR 1:1 DAR 16:9], q=2-31, 407 kb/s, 24.89 fps, 25 tbr, 90k tbn, 25 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (d
efault)
    Metadata:
      creation_time   : 2016-12-20T10:32:18.000000Z
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 2231 fps=0.0 q=-1.0 Lsize=    6279kB time=00:01:29.67 bitrate= 573.6kbits/s speed= 574
x
video:4458kB audio:1051kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 
13.958075%

[yan12125]

Duplicate of #5889.