Wednesday, April 20, 2016

Version 6.2.0 Released

You can download it from SourceForge or GitHub. The major announcement is the introduction of support for libavfilter! This is still a work-in-progress. It is limited to FFmpeg 2.3 and up, and there are a number of filters that are black-listed because they are known to not integrate with MLT, which is not a full libav* environment or simple wrapper for it. There are likey avfilters that are not yet black-listed but might not work because they have not been completely tested. Also, they do not support MLT's keyframable property animation nor its frame-threaded parallelism due to architectural or integration limitations. However, some avfilters are slice-threaded (internal parallelism), and that works. Finally, libavfilter filtergraph syntax is not supported either.

All of the supported libavfilters are exposed as MLT filters beginning with the prefix "avfilter." All of the avfilter parameters are exposed as MLT properties with the "av." prefix to prevent clashes with MLT properties. You can run
melt -query filters to see the new avfilters, and
melt -query filter=avfilter.rotate, for example, to view generated documentation for an individual filter.

Here is a list of notable fixes and enhancements in this release:
  • Added support for libavfilter to avformat module.
  • Added auto-rotate support to avformat producer.
  • Added animated GIF preset for avformat consumer.
  • Prevent serializing and deserializing mlt_type property to xml module.
  • Fixed relative paths for WebVfx "plain:" resources in xml module.
  • Updated libebur128 to v1.1.0 in plus module.
  • Added dynamic_loudness filter to plus module.
  • Added loudness_meter filter to plus module.
  • Qt 5 fixes for kdenlivetitle producer.
  • Added gradients and text shadows to kdenlivetitle producer.
  • Added support for building rtaudio against external build of lib.
  • Upgraded bundled RtAudio to v4.1.2.
  • Added status parameters to ladspa producer and filters.
  • Added 5.1 surround to stereo downmix to audiochannels filter in core module.
  • Fixed compiling SWIG bindings for Ruby 2.0.

Wednesday, February 17, 2016

Version 6.0.0 Released

This is a bugfix and minor enhancement release. Note that our release versioning scheme has changed. We were approaching 1.0 but decided to synchronize release version with the C library ABI version, which is currently at v6. You can download it from SourceForge or GitHub. Here are some of the notable changes and enhancements:

Framework

  • Added unit tests for tractor, multitrack, and field.
  • Deprecate mlt_frame_get_alpha_mask().
  • Added drop_count readable property to mlt_consumer.
  • Added mlt_factory_repository().
  • Added mlt_properties_to_utf8().
  • Define MIN, MAX, CLAMP in mlt_types.h in not already defined.
  • Switched to __APPLE__ and _WIN32 defines throughout codebase.

Modules

  • Added UDP and SMPTE 2022-2 support to cbrts consumer.
  • Fixed build against latest FFmpeg versions - now requires v1.1 and up.
  • Added audiospectrum filter to qt module.
  • Added meta.media.0.codec.rotate property to avformat producer to let apps and other services get the media orientation.
  • Make the avformat producer handle animated images.
  • Added style property to dynamictext filter.
  • Added timewarp producer to core module.
  • Fixed slowly accumulating A/V sync drift in mix audio transition.
  • Added width_crop and width_fit properties to pango producer.

Melt
  • Added -abort option to simply exit without full cleanup.
  • Fix key-press handling on Windows.

Thursday, September 10, 2015

SMPTE 2022-2 Output Added

Thanks to the sponsorship of BCE (Broadcast Centre Europe), the git version of the cbrts consumer now includes SMPTE 2022-2 RTP/UDP output. It has been successfully tested for 36 hours of continuous playback with an ateme DR8400 IRD and the DecTek StreamXpert performing PCR analysis and TR 101 290 monitoring.

Wednesday, July 29, 2015

Version 0.9.8 Released

In addition to the exciting new audio/visualization filters mentioned in the previous blog post, this version features some exciting API improvements for manipulating multitracks and property animations. There are still many services, however, that need updating to support animated properties. Also, since SourceForge is still recovering from a storage problem preventing the upload of new files, you can download the release source archive from GitHub.

Framework


  • Added mlt_service_disconnect_producer() and Mlt::Service::disconnect_producer().
  • Added mlt_multitrack_disconnect() and Mlt::Multitrack::disconnect().
  • Added mlt_tractor_remove_track() and Mlt::Tractor::remove_track().
  • Added mlt_service_insert_producer() and Mlt::Service::insert_producer().
  • Added mlt_multitrack_insert() and Mlt::Multitrack::insert().
  • Added mlt_tractor_insert_track() and Mlt::Tractor::insert_track().
  • Added mlt_transition_set_tracks() and Mlt::Transition::set_tracks().
  • Added Mlt::Properties::get_animation().
  • Added Mlt::Properties::get_anim().
  • Added Mlt:Animation class with methods:
    • length()
    • is_key()
    • keyframe_type()
    • get_item()
    • next_key()
    • previous_key()
    • set_length()
    • remove()
    • interpolate()
    • serialize_cut()
  • Added mlt_animation_key_count() and Mlt::Animation::key_count().
  • Added mlt_animation_key_get() and Mlt::Animation::key_get().

Modules


  • Added audiowaveform video filter.
  • Added fft audio filter.
  • Added dance video filter (uses fft).
  • Added lighshow video filter (uses fft).
  • Added distort property to movit.rect video filter.
  • Added rotate property to pango video producer.
  • Added 2K DCI and 4K modes to decklink producer and consumer.
  • Added audiomap (channel remapping) filter.
  • Added property animation to all LADSPA audio filters and producers.

Thursday, June 18, 2015

New Audio Visualization Filters

MLT developer, Brian, developed 4 new filters, available now in git master. The fft filter uses the fast Fourier transform to produce data for other filters. The dance filter moves, scales, and rotates an image or video in reaction to the audio characteristics. The lightshow filter alters the color of the image based on the audio. Lastly, the audiowaveform filter draws a waveform over the image.

These were all sponsored by the "Learn Your Lyrics" YouTube channel. They generate the videos using MLT through shell scripts that generate long melt command lines. You can see the fft, dance, and audiowaveform filters in action in this video:

Sunday, March 1, 2015

Version 0.9.6 Released

A major regression slipped into the 0.9.4 release plus some other good fixes rolled in just afer that release prompting this new release. Please discontinue using version 0.9.4 and upgrade.

Monday, February 16, 2015

version 0.9.4 released

This is a bugfix and minor enhancement release. Here are some of the notable changes and enhancements.

Framework

  • Added color_trc (transfer characteristic) property to mlt_consumer and mlt_frame.
  • Added Mlt::Profile::set_display_aspect(int, int).
  • Added mlt_pool_stat().
  • Added mlt_smpte_df and mlt_smpte_ndf to mlt_time_format for non-drop-frame timecode support.
  • Added Mlt::Tractor::Tractor(Mlt::Profile&).
  • Added mlt_frame_get_alpha().
  • Added default, copy, and assignment methods to Mlt::Frame.
  • Added Mlt::Filter::process(Mlt::Frame&).

Modules

  • Added support for color_trc property to avformat and opengl modules.
  • Performance improvements for composite and matte transitions.
  • Added fill, halign, and valign properties to affine transition and filter.
  • Added producer.* and consumer.* properties to consumer producer.
  • Fixes for libavformat and libavcodec v56.
  • Dropped support for FFmpeg < v1.0 and Libav < v9.
  • Added a lumakey filter.
  • Added a localtime property to dynamictext filter.
  • Added date/time format string support to dynamictext filter.
  • Added no_root property to xml consumer.
  • Added audio-only tone producer.
  • Added drop property to count producer.
  • Added caching to pango producer to improve performance.

Other

  • Added WMV and WMA avformat consumer presets.
  • Added a ProRes-Kostya avformat consumer preset.
  • Changed VP9 WebM preset to use Opus audio codec.
  • Added 4K UHD and 2.5K QHD profiles.
  • Added x265-medium and x265-medium-pass1 avformat consumer presets.
  • Added a unit test for Mlt::Frame.