![]() ![]() 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. Padding-bottom values for other aspect ratios and 100% width : aspect ratio | padding-bottom value The percentage is calculated with respect to the width of the generated box's containing block (source: w3.org, emphasis mine) (also this is not supported by all players) Resizing required reencoding, so like ProWo wrote its not possible to do what you want without reencoding. This relies on the fact that for padding : mkv does support setting a display resolution, which does tell the player to scale to a specific resolution, but thats about as close as you can get. Right now, I have people people who want this footage. My commands would deinterlace, crop, resize (if needed) & convert to a different container in same pass. I do plan to deinterlace with QTGMC using avisynth & ffmpeg. It will result in a with height equal to 75% of the width of its container (a 4:3 aspect ratio). My videos are capture at 720x480, I corrected my original post & added some more details. ![]() 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. priate value using the aspect ratio it imports from the video file. I need to make output video with 100*200 resolution. Resize a Video Even with fast encoding, transcode will take some time to resize a. 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 You can see the resulting video below: You can add -vf formatyuv420p or -pixfmt yuv420p (when your output is H.264) to increase the compatibility of your video with a wide range of players: ffmpeg -framerate 1 -i happyd.jpg -c:v libx264 -r 30 -pixfmt yuv420p output.mp4. The format is wxh (ffserver default = 160x128,įfmpeg default = same as source). ffmpeg avframe and opencv mat Raw avframemat. How to change resolution of the video with aspect ratio with FFmpeg? Reading and writing videos in OpenCV is very similar to reading and writing images. ![]()
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