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ffmpeg: Using -b option with -target pal-dvd

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steve hearn
ffmpeg: Using -b option with -target pal-dvd
on Jul 31, 2011 at 2:41:55 am

I'm converting a .ts file from a set top box to a mpg file using:

ffmpeg -i data0001.ts -target pal-dvd data0001.mpg

Works great. However, the output file is large, so I'd like to sacrifice some resolution to get the size down.

I tried to use the -b option as follows:

fmpeg -i data0001.ts -target pal-dvd -b 2048 data0001_2048.mpg

I do get a smaller file (about 5 times smaller), but quite pixelated. Problem is I get the same size/quality no matter what value I use for -b. That is I tried -b 1024,2048,4096 etc etc and I always get approximately the same output size/quality.

I dont really have any control over size/quality.

Am I allowed to use the -target and -b together?

Steve


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Michael Rampe
Re: ffmpeg: Using -b option with -target pal-dvd
on Jul 31, 2011 at 5:09:19 am

[steve hearn] " That is I tried -b 1024,2048,4096 etc etc and I always get approximately the same output size/quality."

The -b option is specified in bits.

Try 1024k, 2048k etc. instead. (1M and 2M also work as do 1024000, 2048000)

Michael


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steve hearn
Re: ffmpeg: Using -b option with -target pal-dvd
on Jul 31, 2011 at 10:07:42 am

Michael

Thanks very much for your rapid reply. That explains it! I seem to be getting
much more sensible results now.

Steve


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