<br><br><div class="gmail_quote">On Fri, Sep 24, 2010 at 8:11 PM, Mathieu Bouchard <span dir="ltr"><<a href="mailto:matju@artengine.ca">matju@artengine.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im">On Fri, 24 Sep 2010, Matteo Sisti Sette wrote:<br>
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(guess you mean p-frames and b-frames here)<br>
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You're right. (though I think I saw i-frame somewhere long ago... Corresponds to "inter-frame").<div class="im"><br>
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I thought that m-jpeg was just jpeg applied to each frame independently i.e. all frames were I-frames (I had read that in wikipedia).<br>
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You're probably right, but then I wouldn't know what's the difference between Photo-JPEG and Motion-JPEG. Can Motion-JPEG-A be decoded with a Photo-JPEG decoder ? If that's the case, then Motion-JPEG-A would be just a different tuning of a Photo-JPEG encoder. (but Motion-JPEG-B can't be decoded the same).<br>
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I can't tell much more that isn't just another guess.<div><div></div><div class="h5"><br>
</div></div></blockquote><div class="h5"> <br><a href="http://vjforums.com/showthread.php?t=12587">http://vjforums.com/showthread.php?t=12587</a><br>or a shorter one:<br><span style="" lang="EN-GB">According to the QuickTime specification, MJPEG A and MJPEG B are both
field-based, i.e. each of the two interlaced fields making up a video signal is
compressed individually, using the JPEG algorithm. The difference between MJPEG
A and MJPEG B is that MJPEG A supports markers in the bitstream whereas MJPEG B
does not. Photo JPEG is frame-based, according to the QuickTime specification.
To make things confusing, you sometimes see MJPEG A and MJPEG B also allowing
frame-based compression. This is the case in Adobe Premiere for instance.</span> (<a href="http://w2.alkit.se/servo/servofiles/">http://w2.alkit.se/servo/servofiles/</a>)<br><br><br>Andras<br>
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