The only official filename extension for MPEG-4 Part 14 files is.

A separate hint track is used to include streaming information in the file. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). MP4 files (MPEG-4 Part 14) are multimedia files. Google (Previously developed by On2, Xiph, and Matroska) The video element of the file is encoded using VP8 video codec and the audio element of the file is encoded using the Vorbis audio codec. This means the format is specifically designed for the wide range of devices that are used to access the web, from Smart Phones to Powerful PCs. WebM benefits from being designed for use on the modern web, rather than for local use. WebM is growing, and by using the HTML5 version of YouTube, it is possible to watch video encoded in WebM. It can be used for a variety of types of video, from video calls to high definition movies. Launched in 2010, it is open source format designed to deliver video through the web. VLC media player, MPlayer, K-Multimedia Player, Mozilla Firefox, Opera, Google Chrome, FFmpeg.Similar to the MKV file extension, WEBM is a file format developed by a number of parties, including Google. Most kinds of data can be embedded in MPEG-4 Part 14 files through private streams. In 2013 it was updated to accommodate VP9 video and Opus audio. WebM initially supported VP8 video and Vorbis audio streams. The WebM container is based on a profile of Matroska. And with this conversion I can now properly transfer the videos. The qscale 0 directive instructs ffmpeg not to adjust quality of the video during conversion. The following ffmpeg command will make that happen: ffmpeg -i 'Spider-Man.webm' -qscale 0 'Spider-Man.mp4'. Like most modern container formats, it allows streaming over the Internet. Since mp3s are iOS' best friend, I've needed to convert the webm files to mp4.

MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio and store other data such as subtitles and still images.

Google sponsors the development of the format, and the corresponding software is distributed under a BSD license. It has a sister project, WebP, for images. It is primarily intended to offer a royalty-free alternative to use in the HTML5 video tag. International Organization for Standardization

Ggmpeg convert webm to mp4