I load a still image (say it image.jpg) in Cinelerra, then render it in .m2v
format (say image.m2v) and then with ffmpeg convert it to mpeg format, say
image.mpg.  Then I try to concatenate it to another mpeg file (say movie.mpg)
in order to create a simple text presentation to it lasting some 10 seconds.

Now, if image.mpg has no audio in it, the command

 $ cat image.mpg movie.mpg > total-movie.mpg

creates a new file in which the original audio of movie.mpg is shifted back at
the beginning of total-movie.mpg, that I don't want.

Then I want to add an audio track to image.mpg so that the original audio of
movie.mpg cannot shift back.  What's the proper way to add such an audio track?
I tried with `Audio > add track', but then in total-movie.mpg there's no audio
at all.

Thanks for any help
Rodolfo

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