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blixel
Guru
Joined: 19 Jul 2004
Posts: 403
Location: Central, Florida
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 Posted: Tue Mar 21, 2006 12:07 am Post subject: Simple resizing with transcode |
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I'm trying to transcode an AVI file taken with my digital camera. Using the following command does a good job of reducing the raw video down to something that is more reasonable. (537MB down to 70MB with no noticeable loss of quality)
| Code: | | transcode -i MVI_0512.AVI -y ffmpeg -F mpeg4 -o spd-02.avi -E 44100,16,2 |
I would like to reduce the resolution from the default 640x480 to something like 320x240 so I can get the file size down even more. I tried the following, but none of them work. The file size remains at 70MB.
| Code: | | transcode -i MVI_0512.AVI -y ffmpeg -F mpeg4 -o spd-02.avi -E 44100,16,2 -r2 |
| Code: | | transcode -i MVI_0512.AVI -y ffmpeg -F mpeg4 -o spd-02b.avi -E 44100,16,2 -Z 320x240,fast |
This didn't work either. (According to the man page, the 30,40,8 equates to 30*8=240 and 40*8=320) But using the following, the resolution stays at 640x480. (And of course the file size stays at 70MB.)
| Code: | | transcode -i MVI_0512.AVI -y ffmpeg -F mpeg4 -o spd-02b.avi -E 44100,16,2 -B 30,40,8 -X 30,40,8 |
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jsfan
Apprentice
Joined: 28 Dec 2004
Posts: 204
Location: Melbourne, Australia
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| Posted: Tue Mar 21, 2006 12:42 am Post subject: |
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I'm not very experienced with transcode but I always use --export_prof. This allows you to use the formats of (S)VCD and might help to reduce the size of the file. And you can evwen burn the file on a (S)VCD afterwards.  |
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tuam
l33t
Joined: 04 May 2004
Posts: 765
Location: CGN, Germany
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| Posted: Tue Mar 21, 2006 9:20 pm Post subject: Re: Simple resizing with transcode |
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| blixel wrote: | I would like to reduce the resolution from the default 640x480 to something like 320x240 so I can get the file size down even more. I tried the following, but none of them work. The file size remains at 70MB.
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Shouldn't you also specify the video bitrate with -w ? Otherwise, you might get a video with fewer pixels, but the same bitrate.
FF,
Daniel
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Logic clearly dictates that the needs of the many outweigh the needs of the few. - Spock
The needs of the one outweigh the needs of the many. - Kirk
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blixel
Guru
Joined: 19 Jul 2004
Posts: 403
Location: Central, Florida
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| Posted: Tue Mar 21, 2006 9:36 pm Post subject: Re: Simple resizing with transcode |
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| tuam wrote: | | blixel wrote: | I would like to reduce the resolution from the default 640x480 to something like 320x240 so I can get the file size down even more. I tried the following, but none of them work. The file size remains at 70MB.
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Shouldn't you also specify the video bitrate with -w ? Otherwise, you might get a video with fewer pixels, but the same bitrate. |
Fewer pixels is what I want. 640 multiplied by 480 multiplied by 30 frames a second adds up a lot faster than 320 multiplied by 240 multiplied by 30 frames per second. I still want to have a decent quality video ... I just want the file size to be a bit smaller. There are a variety of ways to get a smaller file ... but I usually just lower the resolution a bit ... (when using a GUI program like Kino ... unfortunately Kino isn't able to open my original AVI. So I'm trying to use transcode instead for this particular task.) |
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