Thanks a lot for your reply!
>> …but I’m having trouble saving in .mpg format. The reason
>> why I would like to save in .mpg format is that
>
>> (1) .avi files are very large
>
> This is wrong and indicates that you don't know what you
> are talking about. This is generally no problem (that's
> why you ask here) but in the context of your question, it
> makes it very difficult to answer…
I should clarify: The avi files that I produce with my current code are very
large.
>
>> and (2) my downstream analysis requires .mpg format.
>
> Could you elaborate?
Actually, the downstream analysis (Ethovision, a behavioral analysis program)
will either take mpg OR avi as input container. The reason why I currently work
with mpg is that my avi output files are very large, but when I convert them to
mpg with a file converter software, they are much smaller. That doesn’t mean
I’m set on mpg — if I could modify my code to make the avi files smaller, that
would do the trick. If I understand correctly, the codec, not the container,
determines file size. Thus, is it possible to save in avi format, but use a
different codec that will generate smaller files?
> mpg (MPEG program streams) are among the few containers
> that are slightly more difficult to use (create) because
> additional constraints are generally necessary ("mpg" is
> not enough), see also FFmpeg's output:
>
>> VBV buffer size not set, using default size of 130KB
>> If you want the mpeg file to be compliant to some
>> specification Like DVD, VCD or others, make sure you
>> set the correct buffer size
>
> If you don't know the difference between container and
> codec (the codec is the reason for "files being very
> large"), now is a good time to find out using Google
> and / or Wikipedia.
Based on what you said, it seems to me that I have two options: (1) save in
avi, but use different codec to reduce file size, (2) save in mpg, but convert
rawvideo. Is this correct? And do you have a suggestion for option 1?
>
>> Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x360
>
> You cannot put rawvideo in mpg (neither program nor
> transport stream), the resulting file will be invalid.
> This is not a limitation of FFmpeg, but the MPEG
> specifications.
>
> Carl Eugen
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