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File video del Computer: Difference between revisions
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'''Valutazione:''' Uno dei migliori contenitori in circolazione. | '''Valutazione:''' Uno dei migliori contenitori in circolazione. | ||
===MP4=== | |||
MP4 sta per: ''MPEG-4 File Format''. The first version was finalised in 1998 and standardised in early 1999. It was the first MP4 file format developed by MPEG and primarily designed for web video and portable hardware (such as mobile phones). Version 1 was superseded by Version 2 shortly after, at the end of 1999 (standardised in 2000) and is fully backward compatible. Since then, MP4 has been extended, and constantly developed. | |||
In addition to supporting the latest MPEG standards, it is also backward compatible with older standards. In MP4 you can contain: | |||
*[[Computer movie files/Video#MPEG-1|MPEG-1]] | |||
*[[Computer movie files/Video#MPEG-2|MPEG-2]] | |||
*[[Computer movie files/Video#h263|h263 (and extensions)]] (via .3gp which is a simplified MPEG-4 V1) | |||
*[[Computer movie files/Video#MPEG-4 ASP|MPEG-4 ASP]] and [[Computer movie files/Video#MPEG-4 AVC|MPEG-4 AVC]] (H.264) video | |||
On the audio side you can store | |||
*[[Computer_movie_files/Audio#MPEG-1_Layer_2_.26_3|MPEG-1/2 Layer 1,2 & 3]] | |||
*[[Computer movie files/Audio#AAC|AAC]] | |||
:*SLS (a scalable lossless extension to AAC) | |||
*AMR (via .3gp) | |||
*CELP & TwinVQ (for low bitrate/speech) | |||
*SAOL (MIDI) | |||
*ALAC (Apple Lossless) | |||
*ALS (MPEG4 standardised lossless format) | |||
It also has its own softsub format, 3GP timed text. Last but not least, MP4 support JPEG & PNG image formats. | |||
MP4 also has a user data atom where you can store meta info about the stream, album art etc. Through the use of private streams, you could also mux [[Computer movie files/Audio#Vorbis|Vorbis]], [[Computer movie files/Audio#AC3|AC3]] or DVD Subpictures. This is not standard and players aren't required to support it. If you want such features, this is the time to use MKV. MP4 also supports menus (there are working players and examples to test). | |||
Bond has a very informative MP4 faq posted at [http://forum.doom9.org/showthread.php?s&threadid=62723 doom9]. | |||
'''Verdict:''' Doesn't support as many formats as MKV, but it supports all the common, popular formats and ISO standards helping to ensure interoperability. MP4 has more "out of the box" support than MKV, this is reflected in commercial software and hardware players, but obviously audio/video decoder support is another matter. If you want native MPEG-4 ASP or H.264 video with MP3 or AAC audio, or you just want to transmux a .ts or .mpg file, MP4 offers just that. If you want softsubs and vorbis, use MKV. | |||