Convert webm to mp4
There's an upcoming Mozilla trip to Hawaii on the cards and, in trying to be a good family man, I'm bringing my wife and two young sons. Glutton for punishment? Probably. Anyways, I've been feverishly downloading cartoons from YouTube using youtube-dl to put onto our new iPad to keep my oldest son occupied during the long flight.
It seems as though YouTube preserves the original video format, since sometimes youtube-dl provides a webm and other times a mp4. Since mp3s are iOS' best friend, I've needed to convert the webm files to mp4. The following ffmpeg command will make that happen:
ffmpeg -i "Spider-Man.webm" -qscale 0 "Spider-Man.mp4"
The qscale 0 directive instructs ffmpeg not to adjust quality of the video during conversion. And with this conversion I can now properly transfer the videos onto my iPad.
Check out my media tutorials for more magic when it comes to video, audio, and images. You're sure to learn a few tricks along the way.
![Page Visibility API]()
One event that's always been lacking within the document is a signal for when the user is looking at a given tab, or another tab. When does the user switch off our site to look at something else? When do they come back?
![5 Awesome New Mozilla Technologies You’ve Never Heard Of]()
My trip to Mozilla Summit 2013 was incredible. I've spent so much time focusing on my project that I had lost sight of all of the great work Mozillians were putting out. MozSummit provided the perfect reminder of how brilliant my colleagues are and how much...
![Using Opacity to Show Focus with jQuery]()
A few days back I debuted a sweet article that made use of MooTools JavaScript and opacity to show focus on a specified element. Here's how to accomplish that feat using jQuery.
The jQuery JavaScript
There you have it. Opacity is a very simple but effective...
![Implement jQuery’s hover() Method in MooTools]()
jQuery offers a quick event shortcut method called hover that accepts two functions that represent mouseover and mouseout actions. Here's how to implement that for MooTools Elements.
The MooTools JavaScript
We implement hover() which accepts to functions; one will be called on mouseenter and the other...
Hello,
Have a look at this : https://www.onlinevideoconverter.com/firefox-addon
This Grease adds a “convert” video to Youtube. Everything is processed on their server and it’s pretty fast !
What about using the
--list-formatsargument with youtube-dl and download the MP4 that suits your needs?Suggested code doesn’t work (10/22/17), Ubuntu 16.04.3 amd64
“The encoder ‘aac’ is experimental but experimental codecs are not enabled, add ‘-strict -2’ if you want to use it.”
It now says “Please use -q:a or -q:v, -qscale is ambiguous”.
I guess
-q:v 0would be the new substitute.