Difference between revisions of "Ffmpeg"

From Wasya Wiki
Jump to: navigation, search
(Common Sizes)
Line 17: Line 17:
 
* The range is exponential, so increasing the CRF value +6 results in roughly half the bitrate / file size, while -6 leads to roughly twice the bitrate.
 
* The range is exponential, so increasing the CRF value +6 results in roughly half the bitrate / file size, while -6 leads to roughly twice the bitrate.
  
=== Common Sizes ===
+
=== Common Video Screen Sizes ===
 +
* https://wasyaco.com/wp-content/uploads/2024/02/Vector_Video_Standards8.jpeg
 +
 
 
* 960x540 horizontal (540x960 vertical)
 
* 960x540 horizontal (540x960 vertical)
 
* 640x360
 
* 640x360
 
* 512x288 (288x512)
 
* 512x288 (288x512)
 
* 340x202
 
* 340x202
 +
 +
* 720x480

Revision as of 18:15, 5 February 2024


ffmpeg -i <input>.mp4 <output>.webm
ffmpeg -i MVI_0083.MP4 -s 960x540 -crf 18 20190322_out.webm
ffmpeg -i MVI_0083.MP4 -s 960x540 20190322_out.mp4
ffmpeg.exe -i "test.avi" -c:v libx264 -crf 20 -c:a aac -strict -2 "test.mp4"

You might want to use the -ss and -t options to create short test encodes. -ss being the start time and -t being the duration — both in seconds. You probably don’t need to encode the entire video to determine what’s acceptable.

crf

  • 0 = lossless
  • 18 = visually lossless
  • 23 = default
  • 28 = sane low quality
  • 51 = worst quality possible
  • The range is exponential, so increasing the CRF value +6 results in roughly half the bitrate / file size, while -6 leads to roughly twice the bitrate.

Common Video Screen Sizes

  • Vector_Video_Standards8.jpeg
  • 960x540 horizontal (540x960 vertical)
  • 640x360
  • 512x288 (288x512)
  • 340x202
  • 720x480