[FFmpeg-user] randomly named png to mp4: ffmpeg

[Leo Izen]

On 01/14/2014 08:02 PM, Tyler Rinker wrote:
> I have a directory with randomly named png files (`a.png b.png c.png`) I
> want to stitch together in a particular order.

You could possibly do this with a concat filter. Try creating a text 
file "concat.txt" that contains three lines:

file 'a.png'
file 'b.png'
file 'c.png'

then, run
ffmpeg -framerate 10 -f concat -i concat.txt
and FFmpeg will concatenate the three "video sequences" (that is, single 
images.) This seems a little bit like nuking a mosquito. Try this other 
solution:

>      cat C:\Users\trinker\Desktop\raw3*.png | ffmpeg -f image2pipe -r 1
> -vcodec png -i - -vcodec libx264 out.mp4
>      cygwin warning:
>        MS-DOS style path detected: C:\Users\trinker\Desktop\raw3*.png
>        Preferred POSIX equivalent is:
> /cygdrive/c/Users/trinker/Desktop/raw3*.png
>        CYGWIN environment variable option "nodosfilewarning" turns off this
> warning.
>        Consult the user's guide for more details about POSIX paths:
>          http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
>      cat: C:\Users\trinker\Desktop\raw3*.png: No such file or directory

Microsoft Windows' CMD does not automatically expand wildcards: most 
windows command line programs are written to do that. However, UNIX 
shell scripts do. UNIX cat won't expand a wildcard because it assumes 
the shell did it for you. This command might work as is if you run the 
command in cygwin's bash (just type bash while in cmd), or you could 
specify the file names individually.

However, if your PNG files are part of a file called list.txt, you can 
run (probably only in cygwin's bash)
cat list.txt | xargs cat | ffmpeg -f image2pipe ...
where xargs will build the command line for cat from the contents of 
list.txt (xargs is a pretty cool tool :D).