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Editorial Team
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Asked: 2026-05-29T09:42:33+00:00

I use this command ffmpeg -i X.mpg -b 533k –vcodec h263 -ac 1 -ab

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I use this command 

ffmpeg -i X.mpg -b 533k –vcodec h263 -ac 1 -ab 48k -acodec aac -strict experimental -s 352x288 X.3gp

from cmd to convert file X from mpg to 3gp. I even used this yesterday and it worked.
Today I decided to improve the command:

ffmpeg –i X.mpg -b 1000k –r 25 –vcodec h263 -ac 1 -ab 15750 –ar 8000 -acodec libopencore_amrnb -s 352x288 X.3gp

Now ffmpeg is completely screwed up, it returns garbage like

[NULL @ 02EFF020] Unable to find a suitable output format for 'ÔÇôvcodec'
ÔÇôvcodec: Invalid argument

or

[NULL @ 02CBEA80] Unable to find a suitable output format for 'ÔÇôi'
ÔÇôi: Invalid argument

even if I use the first command, which it worked and now, on the same file, in the same directory, with a new fresh ffmpeg executable from the same archive I extracted it before, it doesn’t convert anymore.
If I type a nonexistent file as input, ffmpeg gives 

[NULL @ 02CBEA80] Unable to find a suitable output format for 'ÔÇôr'
ÔÇôr: Invalid argument

I really don’t know what to do. Looks like something really basic has been changed…

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1 Answer

  1. Editorial Team

    The dash in –vcodec option is the wrong character (code 0x96, should be 0x2D). Delete and retype. That should fix the problem.

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