Questions tagged [alpha]

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2 votes
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32 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, ...
user119064's user avatar
2 votes
0 answers
439 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 ...
ThomTTP's user avatar
  • 121
1 vote
0 answers
80 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 ...
Shao Zhang's user avatar
1 vote
0 answers
192 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 ...
PEAR's user avatar
  • 111
0 votes
0 answers
33 views

Does Videopad support alpha channels / transparency in videos?

I use software from NCH called Videopad for all my video editing. I am trying to combine two video clips. The first is a standard MP4 video clip, but I have a second WEBM video file, encoded with the ...
soapergem's user avatar
  • 111
0 votes
0 answers
128 views

FFMPEG converts HEVC with Alpha mov to PNG sequence not work well

I have a mov file with HEVC with Alpha codec on Mac. The mov file has no background color, but have some foreground contents in it. I want to use FFMPEG to grab some PNG pictures from it. Following is ...
topfortune's user avatar
0 votes
1 answer
1k 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 ...
Stoopkid's user avatar
  • 101
0 votes
1 answer
39 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> )....
srt111's user avatar
  • 113
0 votes
0 answers
220 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 ...
ina's user avatar
  • 101
0 votes
0 answers
2k 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 ...
Gareth Stack's user avatar
0 votes
0 answers
388 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....
Shao Zhang's user avatar