Hi Dan,

We need this feature for our current project. Could you please let us know if there is a plan to add this feature sometime soon?

Is there a work around the problem?

Thanks,
Rajiv


On Fri, Mar 15, 2013 at 1:34 AM, Dan Dennedy <dan@dennedy.org> wrote:
On Thu, Mar 14, 2013 at 11:45 AM, Dan Dennedy <dan@dennedy.org> wrote:
> On Wed, Mar 13, 2013 at 10:26 PM, Rajiv Kumar <rajiv@manusis.com> wrote:
>> Is there a way in MLT to create a video with transparent background?
>>
>
> Yes, when using the decklink consumer, when you set keyer=1, then it
> will produce a keyed SDI output. When you are using the avformat
> consumer, you need to set mlt_image_format=rgb24a and use a suitable
> output format that has alpha channel such as PNG. I do not know what
> all video file formats have an alpha channel. Then, you need to either
> give MLT source files with an alpha channel or apply a filter that
> affects the alpha channel. There are some frei0r plugins that can
> alter the alpha channel.

Sorry, I made a mistake. The avformat consumer is not capable of alpha
channel output at this time. I will add it to my to-do list.

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