packagerot.blogg.se - Ffmpeg resize video with same aspect ratio

#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO HOW TO#
#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO FOR MAC#
#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO MP4#
#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO WINDOWS#

Syntax for pad is A:B:C:D where A,B,C and D must all be whole integers. Syntax for scale is WIDTHxHEIGHT and WIDTH and HEIGTH must both be whole integers. going from HD to Cinematic, therefore top and bottom pad is required)įirst we scale the original video – width is the determining factor Then NO –vf parameter is required and using the existing –s parameter generated by the module. source and output video have the same aspect ratio) SAR = Source Aspect Ratio = OW/OH (floating number)ĭW = Width of destination (Preset) Output video (must be integer)ĭH = Height of destination (Preset) Output video (must be integer)ĭAR = Destination Aspect Ratio = DW/DH (floating number) OH = Height of original uploaded video (must be integer) OW = Width of original uploaded video (must be integer) The files are from a previous dev version of the module but I hope this helps.

I've attached copies of my TranscoderAbstractionFactoryFfmpeg.inc and which I believe add the padding correctly based on the calculation methods below. map "" -c:v libx264 -crf 18 combAll.Not quite right - I converted a 720x576 (4:3) video to 854x480 (16:9) using a preset with "Pad" for the aspect mode and the resulting video has some left/right padding added to it but not enough and picture seem slightly stretched horizontally - it comes out at 854x525 which is not 16:9. Let’s using hstack and vstack to create a 4\times4 video mosaic: ffmpeg -i field.mp4 -i moon.mp4 -i relax.mp4 -i stream.mp4 \ Or vertically: ffmpeg -i relax.mp4 -i stream.mp4 -filter_complex vstack vComb.mp4 We can stack videos horizontally: ffmpeg -i relax.mp4 -i stream.mp4 -filter_complex hstack hComb.mp4 Now, ffmpeg has provided hstack and vstack that we can use to stack videos. The color of padding area can be changed into white following: ffmpeg -i moon_sc_ar_crp.mp4 -vf "pad=1920:1080:(out_w-in_w)/2:(out_h-in_h)/2:white" moon_padwhite.mp4

In the given example crop=640:in_h:(in_w-out_w)/2:0, the output rectangle has width=640, output height=input height, and will reserve the central area.

x and y are the top left corner of the output rectangle.

out_h indicate the height of the output rectangle.

out_w indicate the width of the output rectangle.

In the definition of crop=out_w:out_h:x:y: We can crop the video using: ffmpeg -i moon_sc_ar.mp4 -vf "crop=640:in_h:(in_w-out_w)/2:0" moon_sc_ar_crp.mp4 The re-scaled video size from last section is 853\times480, it is bigger than expected 640\\times480. We can set the width or height to -2 (computed value will be even) in order to let ffmpeg resize the video keeping the aspect ratio: ffmpeg -i moon.mp4 -vf scale=-2:480 moon_sc_ar.mp4 The video has been distorted with another aspect ratio. It can be resized following: ffmpeg -i moon.mp4 -vf scale=640:480,setdar=4:3 moon_sc.mp4 3.1 Scaleįirst, we have a video with original size as 1920\times1080. Herein, we introduce some common options should do the trick. If the video is wider or too short for presentation, we need ways to resize it. However, let’s compare the result when crf=45: ffmpeg -i field.mp4 -c:v libx264 -crf 45 field_crf45.mp4 Consider 17 or 18 to be visually lossless or nearly so. A lower value leads to higher quality, and a subjectively sane range is 17-28.

The range of the crf scale is 0–51, where 0 is lossless, 23 is the default, and 51 is worst quality possible. Note here we set constant rate factor crf as 18. Let’s convert a video with H.264, in ffmpeg it follows: ffmpeg -i field.mp4 -c:v libx264 -crf 18 field_crf18.mp4

#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO WINDOWS#

For windows user, if one doesn’t have administrator privilege, she/he can just unzip the package and cd the bin folder to run the program.Īfter installation, typing ffmpeg in the terminal, if she/he see the window looks like below, it means the package installed successfully!

#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO FOR MAC#

The first step is to install ffmpeg one can find tutorials for Windows here, and for Mac here. Thus, we only need to re-encode videos using libx264. MPEG-4 AVC) and AAC audio are favored format.

#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO MP4#

Mp4 files encoded with H.264 video (a.k.a. Actually, Microsoft offered reference about supported format and recommendations. However, it doesn’t mean all of them are equally supported inside. Power point supports tons of video formats.

#FFMPEG RESIZE VIDEO WITH SAME ASPECT RATIO HOW TO#

This article introduces how to prepare power point compatible videos with the powerful ffmpeg.