Since there is a Linux version of CasparCG you could try that and see if it
works for you. MLT is great for non linear editing but for live use cases
Caspar is much easier to work with. If you don't mind conforming clips to
your output timebase of course.
30.03.2018 19:36 "Federico Allegretti" <allegf...@gmail.com> napisał(a):
Thanks Dan, maybe i solved this morning.
I wasn't using MLT directly from a lot of time after switching to
other projects that OTVA, so my memory lacks :D but i remember this
morning the -profile directive ;-)
seems that forcing the dv_pal solved the problems with those clips
that before i cannot reproduce using mel command.
So:
./melt -profile dv_pal -consumer decklink:0 test_clip1.mp4
works well
instead:
./melt -consumer decklink:0 test_clip1.mp4
fires: [consumer decklink] Profile is not compatible with decklink.
For me is ok, i solved. Hope this could hel otheres.
PS: Dan, i always have to great you for the great job in MLT (and not only
:-) )
On 29 March 2018 at 19:43, Dan Dennedy <d...@dennedy.org> wrote:
> On Thu, Mar 29, 2018 at 10:26 AM Federico Allegretti <allegf...@gmail.com>
> wrote:
>>
>> hello.
>>
>> experiemnting with melt by command line.
>>
>> Trying to exit trough the deckink consumer like that:
>> melt -consumer decklink file1 file2 file3 ...
>>
>> I forced the fact really hard i suppose, in fact some files are 1080,
>> some 720, some SD and also i mixed 25fps and 30fps clips :D
>>
>> Seems decklink do not love this mess :D
>>
>
> decklink consumer does not care about mixing the video attributes such as
> this. melt will read the first file, get its attributes, and generate a
> mlt_profile from them. Then, the decklink consumer must try to find one of
> its preset video modes [1] that matches the profile. I do not know what
> happened in your case, but it sounds like perhaps the match failed, and
> decklink failed to initialize.
>
>>
>> Is there a trick to "rescale" all of the incoming video iles to a
>> common size/framerate?
>
>
> Use the "-profile <profile_name>" option and choose a compatible profile
> from the list reported by "melt -query profiles"
>
>>
>>
>> upscale to 1080 if HDMI selected trough blackmagic set util or
>> downscale to SD if analog SD video output was set?
>>
>> I tried with resize e rescale filters .. but nothing changed.
>
>
> Scaling is automatic to the profile. Everything is either scaled up or
down,
> preserving aspect ratio, and adding black bar padding where needed (no
> cropping). If you want to center crop to remove black bars you can add
> "-attach crop center=1" following every clip you want to apply it to. If
you
> want full control over scaling/pan/crop, you need to apply a filter such
as
> affine - see one of the GUI MLT apps for examples of usage.
>
>>
>>
>> PS: this set is know by the user and no need to detect it by system
>> properties.
>>
>> Cheers,
>>
>> Federico
>
>
>>
>> --
>> Open TV Architecture project: http://sourceforge.net/projects/otva/
>>
>> Messagenet VOIP: 5338759
>>
>> YouTube Channel: v1p3r's lab
>>
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>>
>>
>>
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