interpolated affine transformation
May 26, 2010
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 :-/
v0.5.2 released
Mar 11, 2010
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.
v0.5.0 released
Feb 16, 2010
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
YADIF
Feb 5, 2010
Since its inception, MLT has been limping along on linear-blending for deinterlacing, but I just added the world-class YADIF deinterlace filter! It is not a new MLT filter that you need to manually apply; rather, it is integrated with the existing one. It is the new default when you are not playing through SDL (i.e. Kdenlive and OpenShot). SDL defaults to linear interpolation (i.e. onefield), which is faster and will not making seeking on AVCHD suck any more than it already does. Encoding through avformat and SDI outputs default to YADIF (which, of course, gets applied only when required).
This took quite a bit of work because this filter requires the preceding and following frames' images to the current frame being processed, and the framework was not equipped to provide that. Also, there were quite a few pitfalls along the way.
v0.4.10 released
Dec 9, 2009
Yesterday, I introduced a fatal bug shortly before the 0.4.8 release. Actually, a bug fix exposed a different bug. So, this release is a "hot fix" release.
