Questions tagged [alpha]

The tag has no usage guidance.

12 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
2 votes
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, ...
user avatar
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 ...
user avatar
  • 121
1 vote
0 answers
45 views

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 ...
user avatar
1 vote
0 answers
127 views

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 ...
user avatar
  • 111
0 votes
1 answer
109 views

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 ...
user avatar
  • 101
0 votes
0 answers
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 ...
user avatar
0 votes
0 answers
95 views

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 ...
user avatar
  • 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 ...
user avatar
0 votes
1 answer
27 views

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> )....
user avatar
  • 113
0 votes
0 answers
99 views

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 ...
user avatar
  • 101
0 votes
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 ...
user avatar
0 votes
0 answers
275 views

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....
user avatar