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How can this MP4 be played in Firefox? From what I know Firefox doesn't support MP4

firefox,mp4,codec
I found this mp4 from the site Giphy. To my surprise it plays in Firefox. Does anyone know how that can be? Normally I have to generate two versions of every video file, mp4 and webm. It would be nice to not have to do that. Here's the file: http://media2.giphy.com/media/yoJC2NG0MLnSoEPjIA/giphy.mp4...

avcodec_open only works with uncompressed format

ffmpeg,static-libraries,codec,avcodec
Context: I have a file called libffmpeg.so, that I took from the APK of an Android application that is using FFMPEG to encode and decode files between several Codecs. Thus, I take for grant that this is compiled with encoding options enable and that this .so file is containing all...

How to encode and decode audio using opus

ios,audio,codec,opus
I am trying integrate opus into my application, the encode and decode function returns positive value which means successfully, but the output audio can't play. Raw audio data can play as well. Here is how I encode data. I use 4 bytes prefix to separate from each packet. self.encoder =...

How to read all video type in a video tag

javascript,php,html5,video,codec
I make a web interface for my server and I want to read all my video, but I have some problems: When I change the innerHTML (in javascript) of my video tag with a new source tag, it keep playing the previous video then I need to refresh the page...

How obtain codec info of an HTML5 video from JavaScript?

javascript,html5,video,codec
I want to know the video codec and, mainly, the audio codec used to encode an HTML5 video because, for example, Firefox supports MP4 video but, in its Windows version, if the audio is encoded with "sowt" the sound will not work. In this cases I can provide a WEBM...

FFmpeg - Requested output format 'mpeg' is not a suitable output format

video,ffmpeg,codec,file-conversion,mpeg
I am trying to use FFmpeg to convert a video from mp4 format to an mpeg, so that I can merge multiple videos. I have a custom build of FFmpeg where I control the configuration options: ffmpeg -y -i VID_20150514_171122_12085.mp4 -an -f mpeg VID_20150514_184208.mp4.0.mpg ffmpeg version git-2015-02-25-b0d3322 Copyright (c) 2000-2015...