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YouTube - Produce - Format.

http://www.youtube.com/watch?v=

https://www.youtube.com/playlist?list=

&time_continue=

16 x 9 -- 1.7778 x 1

YouTube uses 16:9 (1.777) aspect ratio players.

  1920 x 1080 : 1080p  1.7778
  1600 x 900  : -----  1.7778
  1366 x 768  : -----  1.7786
  1360 x 768  : -----  1.7708 
  1280 x 720  :  720p  1.7778
   854 x 480  :  480p  1.7792
   640 x 360  :  360p  1.7778
   426 x 240  :  240p  1.7750

4 x 3 -- 1.33 x 1

  1400 x 1050
   728 x  546
   640 x  480
   633 x  473
   552 x  414
   548 x  411
   512 x  384
   480 x  360
   456 x  343
    16 x   12
     4 x    3
  1.33 x    1
     1 x    0.75
     

Windows - Available resolutions (Dell G7)

  1920 x 1080 : 1080p  1.7778 * (Recommended [Max])
  1680 x 1050 : -----  1.6000
  1600 x  900 : -----  1.7778 *
  1440 x  900 : -----  1.6000
  1400 x 1050 : -----  1.3333
  1366 x  768 : -----  1.7786 *
  1360 x  768 : -----  1.7708 
  1280 x 1024 : -----  1.2500
  1280 x  960 : -----  1.2500
  1280 x  800 : -----  1.6000
  1280 x  768 : -----  1.6667
  1280 x  720 :  720p  1.7778 *
  1280 x  600 : -----  2.1333
  1152 x  864 : -----  1.3333
  1024 x  768 : -----  1.3333
   800 x  600 : -----  1.3333
  

My Youtube upload: 4 x 3

Orig. Upload:
512 x 384 == 1.33

Displays:
 - 456 x 343 (Default) 1.3294
 - 633 x 473 (large)   1.3383

Best Formats for Uploading

YouTube can accept almost any video format for upload, but for most users we have found the following settings give the best results.

• Video Format: H.264, MPEG-2 or MPEG-4 preferred
• Aspect Ratio: Native aspect ratio without letterboxing (examples: 4:3, 16:9)
• Resolution:


• Width Times Height
• W * H
• wxh


1. 480x360 (16:12 - 4:3) [h = 0.75 * w].
   Or, ..
   
2. Recommended >>
   640x360 : (16:9) [h = 0.5625 * w].


• Audio Format: MP3 or AAC preferred
• Frames per second: 30
• Maximum length: 10 minutes (we recommend 2-3 minutes)
• Maximum file size: 1 GB

Archive below

Ideal Youtube Video Format:

Best Video File Formats To Publish Video Online
https://www.youtube.com/watch?v=AQEmzOQW97o
pg 24 of "oldest" to "newest" listing. (914)

Recommended: 

MP4 Considered Best for Public and 
Private servers.

.mp4 codec:h264

Be sure to encode your .mp4 files using 
codec 'h264'.

.flv - Universal Browser acceptance.

All modern browsers are FLV compatible.

FLV files play in the browser
via the "flash Player' plugin.

The Flash Player browser plugin
will also play video formats in addition to .flv
including mp4 files.

My guess is that the Flash player plugin is 
"Adobe Flash Player".

===

• Video Format: H.264, MPEG-2 or MPEG-4 preferred
• Aspect Ratio: Native aspect ratio without letterboxing (examples: 4:3, 16:9)
• Resolution:


• Width Times Height
• W * H
• wxh


1. 480x360 (16:12 - 4:3) [h = 0.75 * w].
   Or, ..
   
2. Recommended >>
   640x360 : (16:9) [h = 0.5625 * w].


• Audio Format: MP3 or AAC preferred
• Frames per second: 30
• Maximum length: 10 minutes (we recommend 2-3 minutes)
• Maximum file size: 1 GB

• 100 MB Max.
• *.MP4. (*.mov, *.windows
• https://www.google.com/support/youtube/
  https://www.google.com/support/youtube/