mpp VS FFmpeg

I cloned and built it (after building its dependencies: librga from https://github.com/JeffyCN/rockchip_mirrors/tree/linux-rga ; mpp from https://github.com/rockchip-linux/mpp)

There's also video4linux2 hardware decode APIs and various vendor-specific libraries, e.g. Rockchip's. On many particular platforms, doing hardware decoding without ffmpeg seems pretty approachable. Even making a nice combo library that supports a variety of them seems feasible. And obviously when the hardware's available (exists, the right kernel drivers are loaded, the C library's around if necessary, the permissions are right, it's not busy, etc.) hardware seems preferable. But it'd be nice to also support a fallback to software and then we're back to ffmpeg.

I know Rockchip have their non-standard "MPP" framework for making use of their hardware encoders and decoders at https://github.com/rockchip-linux/mpp which is an option if you're OK with sticking on the 4.4 BSP kernel.

FFmpeg (https://ffmpeg.org/)

GPL2

Since FFmpeg is GPL2, doesn’t that require CompressX to disclose its source code?

IANAL, apologies if I miss understand license requirements.

https://github.com/FFmpeg/FFmpeg?tab=License-1-ov-file

This turns out to be a lot of assembly macros to help write one x86 assembly. https://github.com/FFmpeg/FFmpeg/blob/master/libavutil/x86/x...

The sibling comment recommending compiler intrinsics is probably the best way to go for writing SIMD code. A mixture of `` style types and intrinsics to specify instructions is a solid 90% solution compared to assembly.

If you want that last 10%, I think macros are putting the emphasis in the wrong place. They're a somewhat easy way to build up a language abstraction which will work if held carefully, but I'm confident the dev experience using this abstraction when you write invalid code will be deeply confusing.

I would suggest to write a parser instead of the macros. That'll tell you clearly when the syntax is invalid (though possibly not with much precision) and it'll give you a place to put semantic analysis for where valid syntax encodes nonsense. Do the equivalent of the macro expansions on the parsed tree instead of on the text. Emit asm as the "back end".

You might have heard of FFMPEG or ImageMagick for image and video edition in a programmatic way. MoviePy is a Python module for video editing (Python wrapper for FFMPEG and ImageMagick). It provides functions for cutting, concatenations, title insertions, video compositing, video processing, and the creation of custom effects. It can read and write common video and audio formats and be run on any platform with Python 2.7 or 3+.

There are many cloud-based tools and websites that can convert your images, but the problem with these tools is that you usually have to upload the files for them to be processed, and some of their services are not free. In this article, I'd like to introduce a piece of software called FFmpeg, which allows you convert the images locally with one simple command.

To run the demo locally, be sure to have Python 3.11 and FFmpeg installed.