Author Topic: A little performance boost for those using video snaps  (Read 264 times)

popoklo

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A little performance boost for those using video snaps
« on: November 06, 2017, 09:01:06 AM »
OIOIOI!

i like to share a Workaround how to Change the Video snap to normal snap.
my Problem was:
Scrolling through games causes heavy loading of Video snaps one after another, on my Retro machine Computer this was unacceptable.
So i tried to delay Video artwork. the Problem seems to be that the videoartwork property

video.video_flags = 0;
video.video_flags = Vid.ImagesOnly | Vid.NoAudio;

will only update and Show effect after transitions. i couldnt make a timer in an on_tick callback and set the new Videoflags. the effect was random.

i didnt know how to force a Transition without doing a Signal, does anybody know?.

so i made a timer in on_tick callback, waiting (800ms) to the Point the Video should load.
when the timer Ends i set a boolian and give two sgnals:

fe.signal("up"); fe.signal("down");

this fires the Transition calllback. The Transition callback then checks the boolian und sets
video.video_flags = 0;
so the Video starts loading and playing.
the up and down Thing is to stay at the current game.

the nice Thing now is: no Video will load immediatly after a new game is selected. it waits 800 MS and then loads the Video.
much better Performance when Holding a key or pushing a key fast to go through games.

this is not needed if someone can tell me how to trigger a transition without navigating signals...


Code: [Select]

local TIMEIDLE = 0;
local IDLE = 0;
local TIME = 0;

local video = gamegrid_surface.add_artwork("snap", 0, 0, 240, 220);

video.video_flags = Vid.ImagesOnly | Vid.NoAudio;


fe.add_signal_handler( "on_signal" );
function on_signal( sig )
{

if ( fe.get_input_state("down") || fe.get_input_state("up") )   //if a key is pressed (navigating to another game) reset timer
{
TIMEIDLE = TIME; IDLE = 0;
        }

switch ( sig )
{
case "up":
{
                                .... here is the code i switch my frame to another game......

return true;
}
case "down":
{
                                .... here is the code i switch my frame to another game......
return true;
}
                }
   return false;
}


fe.add_ticks_callback( this, "on_tick" );

function on_tick( ttime )
{
       TIME = ttime;        //keep track of the global time since AM runs, is used in on_signal callback
if (!IDLE && (ttime - TIMEIDLE > 800))               //check if 800ms since any key was not pressed passed, then activate via fe.signal the transitioncallback, so the video will update its state after the 800ms
{
IDLE = 1;
fe.signal( "down" );fe.signal( "up" );
        }
}


fe.add_transition_callback("artwork_transition");

function artwork_transition( ttype, var, ttime )
{
if (IDLE)  video.video_flags = 0;
        else
if (!IDLE) video.video_flags = Vid.ImagesOnly | Vid.NoAudio;


  return false;
}

« Last Edit: November 10, 2017, 05:06:05 AM by popoklo »

8bitsdeep

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Re: A little performance boost for those using video snaps
« Reply #1 on: November 06, 2017, 02:16:25 PM »
Nice work!  :)  But there's a simpler way to do this built into AM.

Just do this:
my_snap.trigger = Transition.EndNavigation;

This works well on large images too. Highly recommended to anyone making a layout with large assets.

popoklo

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Re: A little performance boost for those using video snaps
« Reply #2 on: November 07, 2017, 05:54:26 AM »
ou nice one! dont know when Navigation activates. is there an example how to use it? when does it trigger? thanks!

calle81

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Re: A little performance boost for those using video snaps
« Reply #3 on: November 07, 2017, 02:58:36 PM »
This could be really awesome. Especially on the raspberry pi even when using Transition.EndNavigation;. Would be great to get a custom snap delay. I tried to use your code snippet but failed. Can you explain what should be in ".... your normal up dowbn handling"

popoklo

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Re: A little performance boost for those using video snaps
« Reply #4 on: November 10, 2017, 04:37:57 AM »
i updated the code. hope its more complete for u to read. see 1st post.
but its only used with my own Gridlayout. if ur using any other gridlayout it must be changed a bit i think.
i also try to use the standard Gridlayout from AM in the future. but i dont like the normal Grid handling.

8bitsdeep

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Re: A little performance boost for those using video snaps
« Reply #5 on: November 11, 2017, 09:12:50 AM »
I just realized an easier way to do this with the delayed loading.

Code: [Select]
local last_nav = 0;
local gtime = 0;
local art_flag = false;

local video = fe.add_image( fe.get_art("snap"), 0, 0, 240, 220);  //Use add_image so the snap doesn't auto-update while navigating

fe.add_transition_callback( "my_transition" );
function my_transition( ttype, var, ttime )
{
if ( ttype == Transition.ToNewSelection )
{
last_nav = gtime;
art_flag = true;
}
}

fe.add_ticks_callback( this, "on_tick" );
function on_tick( ttime )
{
    gtime = ttime;
if (art_flag && (ttime - last_nav > 800))  //800ms delay
{
video.file_name = fe.get_art("snap");
art_flag = false;
}
}

Haven't tested this exact code but the same method worked great in my current layout.  :D

popoklo

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Re: A little performance boost for those using video snaps
« Reply #6 on: November 11, 2017, 11:28:10 AM »
very nice!

i tested the Endnavigation Thing u came with.Its bad that i cant use it with my selfmade layout grid handling :(
EndNavigation works in normal Grid layout! nice!
And with ur new idea even better.
Cause delayed loading is for me very useful.
Think selecting games fast with pushing down fast. not holding it. this would also cause shitty loading without a delay.
perfect. ill try this new idea. thx mään


popoklo

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Re: A little performance boost for those using video snaps
« Reply #7 on: November 12, 2017, 03:31:36 AM »
i had no luck with this method :(

BadFurDay

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Re: A little performance boost for those using video snaps
« Reply #8 on: November 13, 2017, 02:14:41 PM »
i had no luck with this method :(

I'm trying to add this to Cosmo's Main Menu theme to try help with performance but it doesn't want to work for me either.

calle81

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Re: A little performance boost for those using video snaps
« Reply #9 on: November 14, 2017, 09:26:53 AM »
This works great 8bit! I have one issue though. When adding preserve_aspect_ratio = true like below it only applies after i have jumped one item in the wheel, never on the initial video. Any ideas?

if ( my_config["videomode"] == "Center") {
local last_nav = 0;
local gtime = 0;
local art_flag = false;

local video = fe.add_image( fe.get_art("snap"),flx*0.035, fly*0.155, flw*0.65, flh*0.7 );  //Use add_image so the snap doesn't auto-update while navigating
video.preserve_aspect_ratio = true;
fe.add_transition_callback( "my_transition" );
function my_transition( ttype, var, ttime )
{
   if ( ttype == Transition.ToNewSelection )
   {
      last_nav = gtime;
      art_flag = true;
   }
}

fe.add_ticks_callback( this, "on_tick" );
function on_tick( ttime )
{
    gtime = ttime;
   if (art_flag && (ttime - last_nav > 800))  //800ms delay
   {
      video.file_name = fe.get_art("snap");
      art_flag = false;
      
   }
}

}
« Last Edit: November 14, 2017, 09:29:23 AM by calle81 »