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Media Lovin' Toolkit

OpenShot

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

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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making nice slideshows: For a long while MLT had the capability to easily make a slideshow from a folder of photos. This was demonstrated in demo/mlt_slideshow for years and is the basis of Kdenlive's Slideshow virtual clip. However, these slideshows always fell rather "flat" or dull. Over the past year, I have been working on that, and I think all of the pieces are in place now for something much nicer. Here is an example:
http://www.youtube.com/watch?v=JsSutNpBtbA

See the new demo/mlt_slideshow2 to see how easy it was to create that (requires a very recent change to the luma filter that will appear in the next release - v0.5.8):
melt \
photos/.all.jpg ttl=75 \
-attach crop center=1 \
-attach affine transition.cycle=225 transition.geometry="0=0,0:100%x100%;74=-100,-100:120%x120%;75=-60,-60:110%x110%;149=0:0:110%x110%;150=0,-60:110%x110%;224=-60,0:110%x110%" \
-filter luma cycle=75 duration=25 \
-track demo/music1.ogg \
-transition mix

That rather complex looking transition.geometry string is just something I whipped together to add some variety to the animated pan and zooms. A front end tool could contain a collection of these strings to let the author choose a style. Also, notice the addition of automatic center cropping to remove black bars and fill the output frame with the photo image regardless its resolution and aspect ratio.
(Sat, 21 Aug 2010 09:05:01 GMT)
version 0.5.6 released: This is a maintenance release to address some bugs that appeared thus far in the 0.5.x series. Beyond that is a few enhancements:

* Added interpolation to the affine transition and filter.
* Added multi-track audio encoding to avformat consumer.
* Added interlaced field rendering to kdenlivetitle producer.
(Sun, 20 Jun 2010 19:13:38 GMT)
interpolated affine transformation: A popular feature request is to have smooth pan and zoom effects especially over photos for slideshows - a.k.a. the Ken Burns effect. This is currently exposed partially or in various ways in the applications using MLT, but it lacks the smoothness due to not supporting sub-pixel positioning and rendering. The last couple of evenings I have been working on adding interpolation and making other little changes to make it smooth for the next release. Here is a sample video - please excuse the red-eye :-/
http://mltframework.org/mlt/panzoom.ogg
(Wed, 26 May 2010 21:34:00 GMT)
version 0.5.2 released: This is a minor maintenance release, but it is interesting because it now enables usage of libswscale as the default choice for image scaling, image format conversion, and color space conversion. That gives better quality and performance. In addition, there are some improvements in the sdl_preview consumer to make it suitable for use in OpenShot 1.1.
(Thu, 11 Mar 2010 06:51:32 GMT)
version 0.5.0 released: This is an enhancement release, confined mainly to the modules rather than the framework. In particular, this adds support for VDPAU, YADIF, and HD-SDI technologies!

configure: added --disable-sse2

framework:
* mlt_cache: added mlt_cache_set_size()
* mlt_filter: added data property "service" - set when attached
* mlt_frame:
- added Doxygen docs
- added "previous frame" and "next frame" data properties - available
when its producer has _need_previous_next=1
* mlt_playlist: added support for negative out point same as length-1
* mlt_service:
- added mlt_service_cache_purge()
- added "_need_previous_next" handling in mlt_service_get_frame()
- added firing event "service-changed" in mlt_service_attach()

modules:
* avformat producer:
- added decoding H.264 with NVIDIA VDPAU
Requires FFmpeg built with vdpau.
This is automatically detected and enabled. You can disable this by setting environment variable MLT_NO_VDPAU=1 or property novdpau=1.
- added caching of FFmpeg contexts and decoded images
This allows large numbers of clips in a project avoiding limitations with number of threads and file descriptors permitted per process.
You can disable image caching with property noimagecache=1.
- added variant of producer named avformat-novalidate
- restored support for video4linux(2)
* avformat consumer: added apre, fpre, and vpre preset properties
* crop filter: added center_bias integer property
* deinterlace filter: added the excellent YADIF as a method
* kdenlivetitle producer: added text outlining
* linsys/sdi consumer:
- added support for HD-SDI
- changed name from "linsys_sdi" to just "sdi"
* oldfilm filter: added "uneven development" effect
* xml producer: add support for unspecified out points

profiles:
* added several missing ATSC (HD) profiles
* change descriptions from using Hz to fps
(Tue, 16 Feb 2010 07:00:51 GMT)

Topic revision: r34 - 2010-05-31 - 19:08:22 - DanDennedy

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