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On Thu, 28 Dec 2006 18:27:16 +0000 |
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Dave S <gentoo@××××××××.net> wrote: |
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> On Thursday 28 December 2006 17:40, Strong Cypher wrote: |
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> > could you give us the original format of your video ? |
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> |
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> The .avi files were directly generated by a screen capture program |
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> |
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> Dave |
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the avi format is a container format that can work with multiple codecs |
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(see below). perhaps you just need to re-encode them so that either |
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they use a better codec or they are lower qualilty in the same codec |
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(quality is directly proportional to size). Or use a better file format |
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alltogether if you wish. |
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|
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to do video stream editing i recommend the transcode package, as that's |
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the only one I know if. |
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|
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some quick info on avi's |
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http://en.wikipedia.org/wiki/Audio_Video_Interleave says: |
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(quotes) |
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|
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Audio Video Interleave, known by its acronym AVI, is a multimedia |
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container format introduced by Microsoft in November 1992 as part of |
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the Video for Windows technology. AVI files contain both audio and |
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video data in a standard container that allows simultaneous playback. |
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Like DVDs, AVI files support multiple audio and video streams, although |
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these features are rarely used. Most AVI files also use the file format |
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extensions developed by the Matrox OpenDML group in February 1996. |
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These files are supported by Microsoft, and are known unofficially as |
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"AVI 2.0". |
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... |
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By way of the RIFF format, the audio/visual data contained in the |
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"movi" chunk can be encoded or decoded by a software module called a |
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codec. The codec translates between raw data and the data format inside |
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the chunk. An AVI file may therefore carry audio/visual data inside the |
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chunks in almost any compression scheme, including: Full Frames |
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(Uncompressed), Intel Real Time Video, Indeo, Cinepak, Motion JPEG, |
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Editable MPEG, VDOWave, ClearVideo / RealVideo, QPEG, MPEG-4 and others. |
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... |
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AVI is considered by many to be an outdated container format.There is |
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significant overhead when used with popular MPEG-4 codecs ...The |
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container has no native support for those codecs' modern features... |
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cumbersome hacks (in a programming context) are used, |
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causing incompatibilities in some players. Hacks are also used to |
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implement subtitles. The highly efficient H.264 codecs use even more |
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compression tricks, and thus are even more ill-suited to the format, |
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particularly Main and High Profile. |
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(end quotes) |
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-- |
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