[FIXED] How to Convert animated .gif into .webm format in Python?

Issue

I have a web application built on Django where images and animated Gif can be uploaded. However GIF takes long time to load. I was thinking of converting all uploaded gif into webm format and show it on the frontend using HTML5 video tag. I searched a lot for doing this in Python but could not find specific solution. I found this solution. But I want to know is it possible to convert gif into webm while uploading in python or is there any library in python from which this conversion can be accomplished?.

Solution

With MoviePy:

import moviepy.editor as mp
clip = mp.VideoFileClip("mygif.gif")
clip.write_videofile("myvideo.webm")

You can also use any other format (mp4, ogv, etc) and add parameters like bitrate='5000k' or any other parameter supported by FFMPEG. You can also use ffmpeg directly for the conversion instead of moviepy, it will be slightly faster.

Answered By - Zulko

Answer Checked By - Terry (PHPFixing Volunteer)

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[FIXED] How to play .GIFV and .WEBM on iOS

Issue

I am making an reddit client app. So far I have been successfully able to play gif on iOS using FLAnimatedImage library. However for majority of the "gifs" now a days are "gifv" format from imgur and "webm" from gfycat.

Is there any way to play them on iOS? I researched and know that these 2 formats are just fancy videos. However even avplayer won't play them. The official imgur app is able to play them so there has to be a way.

GIF formats are okay but problem arises for bigger files where we need to download the entire file first and that takes time. GIFV plays continuously without having to download the entire file. Hence I need someway to play them in my app.

Solution

@sschale thanks! yes, seems like imgur's gifv is basically mp4 video without audio. So I ended up using avplayer with each URL replaced with mp4 instead of gifv. Same webm replaced with mp4. Added a whole bunch of extra configuration for looping of video etc and got it to work seamlessly. In order for the avplayer to not pause background playing music of other apps, I added:

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryAmbient withOptions:0 error:nil];

Answered By - sudoExclaimationExclaimation

Answer Checked By - Robin (PHPFixing Admin)

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[FIXED] How can I convert gif to webm preserving alpha channel?

Issue

To start out with I have this gif I got from Google Images which has a transparent alpha channel.

Here is the original gif (open it in a new tab to see the transparency):

Here is a recording of it playing on my screen in case it doesn't display right in the browser:

Then I run the following script to convert it to webm, which is what I need for the game framework I'm using.

avconv -f gif img.gif img.webm

However it doesn't maintain the transparency. Here is with an overlay of a properly transparent webm (the water, taken from https://phaser.io/examples/v2/video/alpha-webm)

The white box shouldn't be appearing around the gem.

Solution

First convert the gif to png frames:

convert img.gif img%03d.png

Then combine them into a webm with this command (I had to get outside help on this):

ffmpeg -framerate 25 -f image2 -i ./img%03d.png -c:v libvpx -pix_fmt yuva420p img.webm

Answered By - max pleaner

Answer Checked By - Mildred Charles (PHPFixing Admin)

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