Posted: 5/27/2011 4:44 AM
Post subject: Frame Blending Question
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utunnels
Joined: 5/27/2011
Posts: 5
Hello all, I'm new here. I want to ask a question about avi recording. There are some emulators output avi in 60fps, but since most video sites use 30fps or below as their standard, half of the frames are dropped during conversion. For example, NES or Genesis games usually use sprite blinking to create semi-transparency effect, but after the video is converted to 30fps, those sprites are completely invisible or totally lose their transparency. I used to build a custom gens emulator which merges every two frames, but it is not a good idea to modify every emulator I use. My question is: is there a simple video encoding/converting tool that has frame blending feature like Adobe Premiere? It sounds simple enough, but sadly I haven't found one yet.
Posted: 5/27/2011 4:58 AM
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feos
Site Admin, Skilled player (1236)
Joined: 4/17/2010
Posts: 11274
Location: RU
NES TAS of 2011
If you just blend frames - it may look okay, but sometimes it looks worse because of moving background, for example. We use to reduce 60 FPS to 24 to get almost proper blinking. Instead of every other frame at 60 FPS (30 Hz blinking), we get every 2 frames at 24 FPS (6 Hz blinking).
Warning: When making decisions, I try to collect as much data as possible before actually deciding. I try to abstract away and see the principles behind real world events and people's opinions. I try to generalize them and turn into something clear and reusable. I hate depending on unpredictable and having to make lottery guesses. Any problem can be solved by systems thinking and acting.
Posted: 5/27/2011 5:21 AM
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utunnels
Joined: 5/27/2011
Posts: 5
Yeah, it looks bad when the background scrolls fast, but that is OK to me. Thanks for your advice feos, I can try 24 fps when smooth motion is not that necessary.
Posted: 5/27/2011 10:01 AM
Post subject: Re: Frame Blending Question
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sgrunt
He/Him
Emulator Coder, Former player
Joined: 10/28/2007
Posts: 1360
Location: The dark horror in the back of your mind
utunnels wrote:
My question is: is there a simple video encoding/converting tool that has frame blending feature[...]?
I'm not aware of any such tool that can perform adequately for site purposes. I know some of our encoders previously have used some AVISynth tricks to blend frames together, but our viewers don't like the results. If you do come across anything, let us know.
Posted: 5/27/2011 10:07 AM
Post subject: Re: Frame Blending Question
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Flygon
Joined: 11/4/2007
Posts: 1772
Location: Australia, Victoria
sgrunt wrote:
utunnels wrote:
My question is: is there a simple video encoding/converting tool that has frame blending feature[...]?
I'm not aware of any such tool that can perform adequately for site purposes. I know some of our encoders previously have used some AVISynth tricks to blend frames together, but our viewers don't like the results. If you do come across anything, let us know.
I don't hybrid blend with AviSynth anymore due to the errors it actually has. If you want help with the blending I use, add any of my instant messenging contacts.
Posted: 5/27/2011 2:49 PM
Post subject: Re: Frame Blending Question
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utunnels
Joined: 5/27/2011
Posts: 5
sgrunt wrote:
I know some of our encoders previously have used some AVISynth tricks to blend frames together, but our viewers don't like the results.
Now I recall some encoder program has that option, but I never got it work, hmm... Maybe I shall take another look. Thanks.
Posted: 5/27/2011 2:51 PM
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Flygon
Joined: 11/4/2007
Posts: 1772
Location: Australia, Victoria
utunnels, I do highly recommend that you contact me before you do this, it's difficult to get it looking as best you can, and is best done manually.
Posted: 5/27/2011 3:21 PM
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utunnels
Joined: 5/27/2011
Posts: 5
Flygon wrote:
utunnels, I do highly recommend that you contact me before you do this, it's difficult to get it looking as best you can, and is best done manually.
I'm sending you a PM. Thanks very much for your offer of help. --------------------- Edit* Just tried 24 fps and it looks great.