Questions tagged [alpha]
The alpha tag has no usage guidance.
12
questions with no upvoted or accepted answers
2
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0
answers
25
views
Edges look wrong when compositing layer with blur and transparency
I'm trying to composite layers from an animation I made with Blender in After Effects. The problem I'm running into is that the motion-blurred edges are either receding, or becoming discolored, ...
- 21
2
votes
0
answers
401
views
FFMPEG drops end frames when converting a unmatted alpha .mov to .webm using ffmpeg but converts fine when alpha is premultiplied?
I am using ffmpeg to convert a straight alpha .mov to a webm so I can layer videos on top of one another for a web game however when converted the duration is the right length but the frames freeze ...
- 121
1
vote
0
answers
45
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After Effects doesn’t handle premultiplied images correctly
I’ve been told by various people in the industry that AFX doesn’t handle premultiplied images correctly and I’ve been able to verify this myself in my own pipeline. I’m just not sure if we are all ...
- 27
1
vote
0
answers
127
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export a video from Blender with alpha channel
I have a problem exporting a video from Blender (Cycles Render) with Alpha Channel. Generally it's a scene with sailplane flying about a camera positioned near to the floor. In addition to this it is ...
- 111
0
votes
1
answer
109
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ffmpeg to combine video + alpha video, transparency key with threshold
I have two corresponding video files. One is a regular video and the other is meant to be the alpha channel for that video. I wish to combine them, and use the alpha video to lay a transparency key ...
- 101
0
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0
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55
views
Add Video With Alpha Channel On Top Of Another Video (FFMPEG)
I have two input files, one is a YUV h.264 mp4 file and the other is an 8-bit lossless unencoded RGBA .mov file output directly from After Effects. I would like to put the mov file with the alpha ...
- 91
0
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95
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ffmpeg alpha merge mp4 to alpha mov (heic)
I have two video files (mp4), matte/alpha (white silhouette) and normal.
I want to create a .mov file with transparent background that is possible to play on iOS/Safari devices.
Commands I'm trying to ...
- 101
0
votes
1
answer
398
views
Using a video as alpha mask for another on Davinci Resolve
Sorry I'm new, i can't find a tutorial to do this: i have a normal video and another one that i would like to use as an alpha mask to 'smooth borders' in davinci resolve, here is an example of my mask
...
0
votes
1
answer
27
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Audio not detected with Transparent Video Formats (Quicktime - PNG/QtAnimation- AAC/PCM)
On importing a transparent .mov file (Quicktime - PNG/QtAnimation- AAC/PCM) , the audio is not detected by the Videoeditors (Powerdirector17 < Davinci Resolve doesn't support the above format> )....
- 113
0
votes
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99
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ffmpg (copy existing settings?) or crop a .mov with alpha and have it be open-able using Quicktime (not VLC)
How do you have ffmpeg copy all existing settings except the crop dimensions of a video file?
I've been struggling to crop an .mov with alpha channel (transparent video), so that it can be opened ...
- 101
0
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0
answers
964
views
Importing Clip with Alpha Transparency into Resolve
Working on a video for a client with a third party animation company.
I need to figure out a file format they can export video with alpha transparency, that Resolve will import correctly.
Ordinarily I ...
0
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0
answers
275
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ffmpeg prores alpha channel quantization looks pretty bad
Might be related to this other ticket?
I've been doing some prores tests for both color and alpha. Usually this isn't a big deal since my alpha channels are solid with a 1-2pixel transition to black....
- 27