Media Lovin' Toolkit

Flowblade

“author, manage, and run multitrack audio/video compositions”

“the engine of a non-linear video editor that can be used in all sorts of apps, not just desktop video editors”

MLT is an open source multimedia framework, designed and developed for television broadcasting. It provides a toolkit for broadcasters, video editors, media players, transcoders, web streamers and many more types of applications. The functionality of the system is provided via an assortment of ready to use tools, XML authoring components, and an extensible plug-in based API.

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MLT Adds GPU Image Processing Sat, 23 Feb 2013 07:17:00 +0000

For a few months, we have been working on a set of image processing filters and transitions that utilize the OpenGL Shader Language (GLSL) of your video card/chip. This means that not only are they very fast but also cross-platform and widely supported. GLSL is generally faster and better supported than OpenCL and NVIDIA CUDA because those technologies are rather new or vendor-specific and designed for more general purpose computing. The new filters are also high quality by using 16-bit linear floating point per color component. All of this means that you can apply more effects without a huge reduction in frame rate.

This work has now been merged into the master code branch and will be available in the next release. They have already been integrated into the Shotcut daily builds for all 3 major OS platforms! However, a caveat - there is not much to see there yet because Shotcut does not yet have filters. smile

Nevertheless, it has served as a feasibility exercise of the cross-platform integration. Meanwhile, one can open a clip, save as XML, edit the XML to put something like <filter mlt_service="movit.mirror"/> inside of the <producer></producer>, open the XML in Shotcut, and see the result. But first you will need to enable GPU Processing in the Settings menu.

What is currently available?

movit.blur
movit.convert (colorspace conversion)
movit.crop
movit.diffusion
movit.glow
movit.lift_gamma_gain (color correction)
movit.mirror
movit.opacity
movit.rect (position and scale)
movit.resample
movit.resize (pad)
movit.saturation
movit.sharpen
movit.vignette
movit.white_balance
movit.mix (transition)
movit.overlay (transition)
qglsl (a wrapper to multi consumer that uses Qt to abstract platform-specific OpenGL context)

More information can be found in the documentation section of the website.

What still needs to be done?

A new threading model to improve concurrency between CPU and GPU
More work on qglsl to support more multi-consumer use cases
Keyframable parameters throughout

Thanks

We thank Christophe Thommeret for providing the proof-of-concept which provided many ideas about how to integrate something like this with MLT.

We thank Steinar H. Gunderson for providing the new Movit library, which is an external dependency that provides all of the heavy lifting here.

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version 0.8.8 released Mon, 21 Jan 2013 06:03:00 +0000

This is purely a bugfix/maintenance release. If you are using a very recent version of FFmpeg or libav that has switched to using planar audio in its API you will need this.

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Video Tutorial Series by Kris Occhipinti (metalx) Fri, 23 Nov 2012 20:24:00 +0000

Prolific screen-caster and video tutorial maker MetalX has started a series on video editing on the command line featuring melt.

In case you do not like the embed, here is a link to the YouTube playlist.

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version 0.8.6 released Wed, 14 Nov 2012 17:20:00 +0000

This is a bugfix and minor enhancement release.

Added playlist-next event and PlaylistNextListener to Ruby binding
FFmpeg 1.0 and libAV master compatibility
Improvements to motion_est filter to generate keyframes for apps
Added audiolevel (measurement) filter

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DVEO (Linsys) SDI driver Fri, 26 Oct 2012 16:47:00 +0000

If you are using MLT with the DVEO (formerly Linsys) SDI or ASI cards on Linux, you should know that the drivers stopped building somewhere between kernel 3.0 and 3.2. The Open Broadcast Encoder project made some simple fixes available on their github repo.

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Topic revision: r48 - 2012-06-22 - DanDennedy

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