#FFMPEG SCALE DOWN SIZE HOW TO#
#FFMPEG SCALE DOWN SIZE 1080P#

Vainfo: Driver version: Intel i965 driver for Intel (R ) Ivybridge Mobile - 2.1. Vainfo: VA-API version: 1.1 (libva 2.1.0 ) Libva info: Found init function _vaDriverInit_1_1 Libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so Libva info: va_getDriverName ( ) returns 0 Let’s download a sample video from h264info and scale down without any options: or you could use -s like so: -s 640x360 - this can be used either as. You could use the scale filter: -filter:v scale-1:360.

Imagine you are creating a service to provide video streaming with different quality (720p, 1080p, etc.), so you need to scale down the uploaded video to different resolution. I would like to reduce the resolution by half to 640x360.

Baseline: Scale a video without any options Let’s do an experiment to see the differences. So is there any other way to make FFmpeg faster? Yes, and you can do that within seconds using VAAPI.

#FFMPEG SCALE DOWN SIZE HOW TO#

In my own experience, I spent hours to research how to install and compile FFmpeg, but fails in the end as my GPU is unable to support most of the features, that was sad. Where iw and ih means the width and height of the input video. ffmpeg -i input.mp4 -vf 'scaleiw:ih/2:0:0' outputdown2.mp4. On the width: ffmpeg -i input.mp4 -vf 'scaletrunc (iw/4)2:-1' outputdown2.mp4.

#FFMPEG SCALE DOWN SIZE 1080P#

Youre better off with a nice 1080p video than a distracting 4K video. Lanczos is a common scale algorithm to use, avoiding a blocky looking video after the upscale.

You need to compile FFmpeg from source if you cannot find a ready-to-use version How to scale down a video by 50 preserving the aspect ratio. Using a slow preset will give good compression and a CRF of 19 will keep most of the original video quality.

You need to install nVidia GPU drivers and CUDA (painful in Linux environment).

You don’t own a compatible nVidia GPU card.

If you google how to improve the speed of FFmpeg, you may find discussions about using -preset which lowers the compression ratio for higher speed (a trade-off between file size and speed) and another sexy approach is to leverage nVidia GPU (nvenc, nvdec and cuvid), but it it is not easy as: TechBlog Speedup FFmpeg without compiling from source codeįFmpeg is a great tool when it comes to multimedia manipulation, by default it uses CPU with multi-thread to do the task which causes a high loading to your PC and is kind of slow most of the time.

Ffmpeg scale down size