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MPEG-1 and MPEG-2 medias are not well supported by QuickTime, to say the least.
SimpleMovieX provides a much better support, mainly in 2 areas:
MPEG-1 and MPEG-2 media are usually distributed in files with .mpg extension. MPEG-4 media uses the .mp4 extension. All 3 types can also be packed inside a native QuickTime .mov file.
But MPEG-1 and MPEG-2 codecs have some limitations that we explain below :
MPEG-2
MPEG-2 media is supported by SimpleMovieX only if you have installed the QuickTime MPEG-2 Playback Component.
Even though, SimpleMovieX MPEG-2 support has some restrictions. Those restrictions are inherited from the MPEG-2 Component, and are listed here. Remember those 3 points :
We will improve MPEG-2 support in next versions of SimpleMovieX to overcome those limitations.
Accuracy of Edition
MPEG-1 and MPEG-2 were designed in the early nineties for the distribution of video contents at medium to low data rates, and have been successfully implemented in 2 popular applications : VideoCD and DVD.
Unlike most of other codecs, MPEG-1 and MPEG-2 are quite difficult to edit, because they use temporal compression, which means that the information required to display a frame is not at one particular location, but distributed along the last 10 to 20 frames, or Group of Pictures (GOP).
Technically, it is not possible to cut or paste inside a GOP with reencoding media, which is very slow and involves a loss of quality. For this reason, MPEG is not an edition codec.
SimpleMovieX is capable of :
Note that QuickTime Player is not very good at MPEG playback, and some artefacts may appear at cut point. This will not happen with other players like VLC.
Export Limitations
SimpleMovieX can export your movie as an .mpg file. This is possible when :
Export to other formats or to other codecs (like DV or Sorenson3) no longer removes the audio track. SimpleMovieX does not reencode MPEG when exporting to .mpg. This is why it is super-fast. Furthermore, the file size in not limited to 2GB ! |
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Support of individual streams
Usually, MPEG media is "muxed", which means that video and audio information are interleaved inside the file. In some cases, video and audio are separated in two different files or "streams".
SimpleMovieX does not officially support individual streams, but usually it works fine.