this movie here ( ) has exactly the same codecs, but this time "ima4" is detected as a second video track instead of the audio track.according to mplayer they should be "ima4" (IMA ADPCM) for audio and "SVQ3" (Sorensen Video 3) for the video track. while "MPEG-4 Audio" is technically correct, i think it would be more helpfull for users if you would write "MPEG-4 Audio (AAC)" and maybe even "MPEG-4 Audio (HE-AAC)" too."MPEG-4 Video" should maybe renamed to "MPEG-4 (A)SP" and "MPEG-4 AVC" to better differentiate the two variants.why is the mpeg container called "MPEG 1 Multiplexer" instead of simply "MPEG 1"? is this the official name?.i guess "S-Mpeg 4 v3" should really be "MS-Mpeg 4 v3", right?.i'm not sure if those are really mpeg audio streams, but it could very well be so. swf (flash) supported? its not mentioned anywhere but mediainfo finds mpeg-audio streams in some of them (albeit with bitrate 0). Post any questions or suggestions in the comments. Task - Crack open a video fileTake a video file and examine the different parts of it, streams and metadata using Mediainfo. Popular audio codecs include ac-2, ogg theora and mp3. Popular video codecs include h264, vp8, mpeg2. Right now we just need to understand that they are used to compress media data so that it takes up less space. We learn much more about codecs and containers in the following chapters. This container allows you to add more than one audio stream.Įach stream that we see here has audio or video information that is compressed using codecs. The information of the video above shows us a video file using the Matroska container (.mkv). We can see this in the video file listed below. Sometimes we can have files that contain many different video and audio streams, this can be particularly useful if we have a film with different audio streams in different languages. We can see that the WebM container here has one video stream and one audio stream. Containers themselves don't contain any video or audio content, they are the vehicle in which that content travels. It is also useful right at the start to understand the parts video files are made up of. This information will be useful to us later in this course when we start to work with video files. The General section here gives us the following information When we open the video file MediaInfo reads the file but instead of playing the video it displays information about it. Let's open one of our video files by clicking on the Open File icon or selecting File > Open > Open File(s) from the menu. When you have installed MediaInfo launch it and you should get an interface like the one shown below. Using MediaInfo to investigate the anatomy of video files To find out more we will use another Free Software programme called Media Info. However, just playing the file doesn't help us to really understand what is inside it. We can play this file on our desktop using an video playing application like VLC. If in doubt, you can use the one listed in the last task. Mediainfo - available for Mac, Linux & Windowsĭownload a video file in WebM format.Use a programme to find out more information about these streams.Understand that video files can have different streams.To do this we will download a video file and take a look at what is inside.īy the end of this task you should be able to: This task aims to give an introductory look at what makes up a video file.
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