In order to keep the aspect ratio of the div and prevent its content from stretching it, you need to add an absolutely positioned child and stretch it to the edges of the wrapper with: div. vf scale filter, it is possible to resize videos to a desired size: ffmpeg-i input. Padding-bottom values for other aspect ratios and 100% width : aspect ratio | padding-bottom value Bitrate Control and Buffer Size in FFmpeg Implementing the bitrate. The percentage is calculated with respect to the width of the generated box's containing block (source: w3.org, emphasis mine) This relies on the fact that for padding : In some cases, FFmpeg will set the Sample Aspect Ratio to compensate for the ratio change.I use the following command: ffmpeg-i test.mp4 -vf scale'1000:200' method enforces a specific output aspect ratio.Specify the Width To Retain the Aspect Ratio ffmpeg-i input.mp4 -vf scale320:-1 output.mp4 The resulting video will.

It will result in a with height equal to 75% of the width of its container (a 4:3 aspect ratio). How can I limit output video by width, with auto aspect ratio by height?įor example, I want specify for the output video only width 100px and ffmpeg must automatically calculate height with right aspect ratio. If I will run ffmpeg with -s 100×200, then second video will have bad aspect ratio. I need to make output video with 100*200 resolution. Set the video display aspect ratio specified by aspect.Īspect can be a floating point number string, or a string of theįorm num:den, where num and den are the numerator and denominator The format is wxh (ffserver default = 160x128,įfmpeg default = same as source). Needed quick videoplayer quad mesh resizer, to match video size, so here’s a small editor helper script: It checks video width and height, and then scales transform Y axis to match aspect rat.

How to change resolution of the video with aspect ratio with FFmpeg?

Ffmpeg resize video keep aspect