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Questions tagged [mlt]

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.

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.

Source: http://www.mltframework.org

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mlt failing after upgrade to fedora 36

Since upgrading my PC from Fedora 35 to Fedora 36, kdenlive has failed to render. I traced the problem to mlt-melt. $ mlt-melt export.mlt +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ |1=-10| |2= -5| |3= -2| |4= -1| |5= …
Phantom of Krankor
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Melt throws “Property without service 'property'”

When building certain mlt files with melt 7.1.0, they run just fine, but when building them with melt 6.24.0, the error message [producer_xml] Property without service 'property'? [producer_xml] Property without service 'property'?? appears any…
Hermann Döppes
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Is X11 required for adding text overlay?

I'm trying to run the below command in a script and it seems it's not adding any text layout to the video, I'm sure I didn't it before and it was fine. My question is, do I need to set up X11 environment in order to use dynamictext or text…
AFT
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Crop filter isn't applied to mixing transitions?

When I apply a -filter crop parameter to my melt script, it only seems to crop each clip - not the -mix mixing between clips. melt \ clip1.mp4 in=180 out=360 \ -mix 20 -mixer luma -mixer mix:-1 \ clip2.mp4 in=660 out=960 \ -mix 20 -mixer luma -mixer…
mr_lou
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h264_qsv leads to memory leak

I use h264_qsv encoder to export a video. The mlt xml :
xin ding
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pass ffmpeg options through mlt xml

I'm looking at an MLT XML file that I created with kdenlive and would like to tweak the command line options passed to ffmpeg. If I understand correclty, this is the part that I need to edit:
carsten
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mlt: image distortion using lossless codec

I have two 1920x1080 PNG files, center.png and right.png, which are identical except that the image in right.png is shifted horizontally by 325 pixels. With mlt XML, I made a two-second long video using the lossless FFV1 format, showing one second…
msp
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Side by side video with slideshow and change sizes in MLT

I have a specific task I'm attempting to do. Unfortunately I am not an expert in MLT and was given this project and told to "go do it" The end goal is to have video plus a slideshow side by side in an mp4 file. This video and the slideshow will…
user3850480
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What is the difference between MLT profiles and MLT presets?

MLT profiles and MLT presets They're both text files of thing=thing\n which apply to an MLT thing, which change how the 'mlt service' works. And how can I add a new profile? And a new preset?
650aa6a2
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How to compile a simple MLT example in C?

I am trying to compile an example code from the MLT Framework website that shows how consumer/producer work. The code is as follows: #include #include #include int main( int argc, char *argv[] ) { //…
Mehdi Haghgoo
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Using mlt framework to export flac file play time error

I use the mlt framework to convert aac to flac files,and the code as follows: ''' consumer.set("acodec", "flac"); consumer.set("ab","1030k"); consumer.set("ar",44100); consumer.set("channels",2); ''' but the time of flac file is wrong.
xin ding
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The exception caused by modify FPS

I use the mlt++ modify FPS as follows: consumer->set("frame_rate_num", 60.0); consumer->set("frame_rate_den", 1); producer->profile()->set_frame_rate(60, 1); producer->set("length",…
xin ding
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generate video containing scrolling image using MLT

I want to generate a video [let's say 1920x1020] from a 1920x10000 still image. The image has to scroll, from top to bottom as if someone was actually scrolling a page. Found answers how to make it with ffmpeg, but i need to scroll it in mlt as i…
user2455079
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MLT/XML: optimizing repetitive attribute lists in a tag

I'm working on a project that will produce MLT files based on user input. A typical case may produce an MLT file containing thousands of nearly-similar filters. Each filter will have 11 attributes, but only 3 attributes will change from filter to…
msp
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MLT transparency of watermarks and tracks not working

I am trying to get melt to work, but it seems, it doesn't support transparency (alpha channels)! Using the official watermarking example, I get a black background behind the PNG and don't see any video through. melt \ test.mp4 out=1000 \ -track…
tobidude
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