GES 1.14 -- How to achieve crossfade

[Thibault Saunier]

I knew it :-)

Just pushed a simple example in python:
https://gitlab.freedesktop.org/gstreamer/gst-editing-services/blob/master/examples/python/keyframes.py

You should be able to extrapolate for any language you use (also I
would be happy to review the port of that example to that language ;))



Thibault.

On Thu, Feb 21, 2019 at 1:56 PM David Ing <ding at panopto.com> wrote:
>
> I don't know how to do that.
>
> On Wed, Feb 20, 2019 at 3:59 PM Thibault Saunier <saunierthibault at gmail.com> wrote:
>>
>> Then you should keyframe the alpha child property of the source :)
>>
>> On Wed, Feb 20, 2019, 20:26 David Ing <ding at panopto.com> wrote:
>>>
>>> What if I did not want a transition between two clips "a" and "b", but instead I want clip "a" to transition into whatever the lower-priority layers had drawn?
>>>
>>> On Wed, Feb 20, 2019 at 2:12 PM David Ing <ding at panopto.com> wrote:
>>>>
>>>> Thank you!
>>>>
>>>> On Wed, Feb 20, 2019 at 2:00 PM Thibault Saunier <saunierthibault at gmail.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Feb 20, 2019, 18:44 David Ing <ding at panopto.com> wrote:
>>>>>>
>>>>>> Thibault, you said "Transitions happen between 2 overlapping clips".  Do you mean two clips within the same layer?
>>>>>>
>>>>>>
>>>>>> Are you saying that this will achieve a 2-second crossfade from a --> b?
>>>>>>
>>>>>> Layer 1:
>>>>>>
>>>>>> GESSourceClip a
>>>>>>
>>>>>> starts at 0 seconds
>>>>>> ends at 11 seconds
>>>>>>
>>>>>> GESTransitionClip c
>>>>>>
>>>>>> starts at 9 seconds
>>>>>>
>>>>>> ends at 11 seconds
>>>>>>
>>>>>> GESSourceClip b
>>>>>>
>>>>>> starts at 9 seconds
>>>>>> ends at 20 seconds
>>>>>
>>>>>
>>>>> That is correct yes :)
>>>>>>
>>>>>>
>>>>>> On Wed, Feb 20, 2019 at 1:37 PM Thibault Saunier <saunierthibault at gmail.com> wrote:
>>>>>>>
>>>>>>> Hello David,
>>>>>>>
>>>>>>> Transitions happen between 2 overlapping clips so you need to make sure clips overlap at the point where you add them.
>>>>>>>
>>>>>>> Alternatively, you can use the GESTimeline::auto-transition property to automatically create transitions when 2 clips overlap.
>>>>>>>
>>>>>>> Regards,
>>>>>>>
>>>>>>> Thibault
>>>>>>>
>>>>>>> On Wed, Feb 20, 2019, 17:47 David Ing <ding at panopto.com> wrote:
>>>>>>>>
>>>>>>>> I am struggling to find a clean example for how to achieve a crossfade.
>>>>>>>>
>>>>>>>> I have a layer which contains two clips of type GESSourceClip:
>>>>>>>>
>>>>>>>> GESSourceClip a
>>>>>>>>
>>>>>>>> starts at 0 seconds
>>>>>>>> ends at 9.999999999 seconds
>>>>>>>>
>>>>>>>> GESSourceClip b
>>>>>>>>
>>>>>>>> starts at 10 seconds
>>>>>>>> ends at 20 seconds
>>>>>>>>
>>>>>>>>
>>>>>>>> Now I want a 2 second crossfade from "a" to "b" ... but how?
>>>>>>>>
>>>>>>>> Do I create a GESTransitionClip and insert it into the layer between "a" and "b"?
>>>>>>>>
>>>>>>>> What about the timings.  Do I keep the timings for "a" and "b" unchanged, but set the transition clip as follows?
>>>>>>>>
>>>>>>>> starts at 9 seconds
>>>>>>>> ends at 11 seconds
>>>>>>>>
>>>>>>>> Is it okay for the GESTransitionClip to overlap with GESSourceClip with respect to time?
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