Avi file size compared to m2v file size

I saved a movie clip in MPEG for computer playback. The file size was 112MB. The preset was H.264 1440x1080i 25, no export audio, the codec was MainConcept H.264 Video, TV standard was automatic, frame dimensions were 720 by 480, frame rate was 29.97, field order was automatic, fixed aspect ratio was automatic, level was 4.1, bitrate encoding was VBR, 2 Pass, and Bitrate level was high. I then saved the file in AVI and the file size was 426MB. The preset was Microsoft AVI, no export audio, the video codec was Cinepak Codec by Radius, quality was 100, size was 720 by 480, frame rate was 29.97, field type was lowere first and aspect was square pixels. Why would the file size nearly quadruple and what can I do to get the AVI file size down below 400MB? Thanks.
Steve

Well, for one thing, you're going from one format to another -- but, more so, you're going from one codec (compression system) to another.
The H.264 codec is the one used for creating AVCHD video, although not all H.264 video is AVCHD. It can also be used as a delivery format (that's a format that you display online or play on a computer) -- which seems to be the case here. Your source is apparently from an AVCHD camcorder, although at that file size it must only be about 10 seconds long.
Though that's hard to say too. Codecs can be highly compressed or lightly compressed, so two files using the same codec and the same file format can be very different in size!
The Cinepak codec is also a delivery format, though it uses a completely different codec system as well as being for a different file format (AVI). You would neer use a file with a Cinepak codec as source material for editing. It's a highly compressed delivery format. Convert the file to a DV-AVI (an AVI using the DV codec) and it will likely be many times that size.

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Post in the Premiere Pro forum. This forum is for suite specific issues only.
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Statement does mean files from QT to DV have audio but but following same route in streamclip the audio disappears. Streamclip app downloaded fresh from their site and tried current and new beta version with same poor results... Checked movie properties on AVI file and contains video xvid 1.0 and audio microsoft ADPCM file. When converted to DV in QT video changes to DV - PAL and audio to DV. When using stream clip video changes to DV - PAL and audio to DV but sound doesn't work??????
Very strange. Would normally have expected the reverse -- i.e., problems with some QT based applications but no problems in MPEG Streamclip as adaptive PCM is usually a "conversion" compatible but not always an "edit" compatible format for Apple applications. Would still like to run my own tests to see if I can duplicate your problem on my system(s) as the question of the source of the problem remains open at this time.
I'm using ilife 09 with imovie updated regularly. The reason I said it wasn't relevant was because the streamclip had no sound in QT so no need to try imovie.
Your reasoning is fine as far as it goes but using iMovie '09 opens the door for native editing in DV and AIC for higher video quality (as already mentioned), as well as, H.264 with unrestricted data rates, Motion JPEG and Photo JPEG for medium quality video compression to medium size files, and/or MPEG-4 and H.264 with restricted data rates for lower quality but much smaller editing files. It also restricts you from using the Animation codec which is otherwise one of my favorite intermediate compression formats (which, if Apple hasn't fixed the problem, imports to iMovie '08/'09 but only exports as a blank black screen). Basically this means you have more conversion options for editing natively in iMovie having different video data rates which, in turn, means you can balance the editing file size against preserved quality as may be needed for different iMovie projects.
Can i please ask the following. The file sizes vary hugely but the quality appears the same after conversions. The AVI file is 17mb, the DV conversion in QT is 242mb and the MOV file created in imovie for the project is 49mb???? I oask because of disk space?
File size is directly proportional to the total data rate (i.e., amount of data per unit of time). All this means is that the more data you have per second in a file, the larger that file will be for a given duration. DV typically has a total data rate of about 28.5, 57.0, or about 112-114 mbps depending on the specific video and audio codecs in use. (The codecs are sometimes referred to as DV25, DV50, or DV100.) DV 25 is usually seen as DV video with DV audio (i.e., DV/DV) files which, depending on which Apple application/utility is measuring the file size, may appear to be twice its actual size. (I.e., some applications count the audio and video DV separately and add them together when it shouldn't.) In any case, DV video is not highly compressed and so the files are relatively large. Since the art of compression is actually the art of "throwing out data," DV files tend to retain more of the visual data from the source file than when converting to other, highly compressed video formats. Unfortunately, these files have very strict standards regarding the encoding matrix the playback dimensions and some applications can, in certain instances, actually lose the anamorphic flag required for proper playback/handling which can cause serious problems for some users. This is one of the reasons I tend to prefer the AIC codec which was specifically developed as an intermediate codec for both anamorphic SD, as well as, HD content. (I.e., it is a more versatile codec in today's world of multi-dimensioned multimedia files.) The other, is that AIC has a typical video data rate about 20-25% smaller than DV video with about the same level of quality.
In any event, to get back to your original question, the DIVX 5 codec is a more efficient compressor having a much lower video data rate than DV video. (Simple compare the video data rates of each to see what I mean here.) When you convert the DivX encoded data to DV you are trading data rates/file size for the retention of as much of the original visual quality as you can. If your current project (e.g., a project targeted as a 320x240 posting to the internet) does not require the retention of maximum quality, then you have the option of trying a more efficient codec with a lower data rate which would, of course, produce a smaller file for editing in iMovie. For instance, I would normally expect an MJPEG/AIFF file combination to be about 40-50% the size of your DV editing file. You may wish to try an MJPEG/AIFF or MJPEG/AAC editing project to see if you can detect much loss in visual quality and then decide which format is best for your particular work flow.
Hope this helps to understand what is going on here.

AVI files and re-rendering

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Okay, thanks for the tip. As far as using the settings that match my sequence settings, I'm not sure I can do that with the export to DV with QuickTime Player.
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Avi file size compared to m2v file size

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