FFMPEG from VBS

Question

I'm having an issue while running ffmpeg from VBS as follows:

Cmd = "cmd.exe /K " & Chr(34) & """C:\Users\admin\Documents\ffmpeg\bin\ffmpeg.exe""" & Chr(34) & " -i " & Chr(34) & """C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mxf""" & Chr(34) & " -vcodec copy -acodec copy " & Chr(34) & """C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mp4""" & Chr(34) '& " 2> " & Chr(34) & "LogFile.txt" & Chr(34)

objShell.Run Cmd, 10, True

I'm getting error: The system cannot find the path specified

The path for the input/output files is correct. I can guess this seems to be an escape sequence issue. Can some please point out.

Why are you adding `Chr(34)` when you already escape the double quotes using `""`? Get rid of the `" & Chr(34) & "` and it will work. — user692942, Sep 15 '20 at 10:25

user692942 · Accepted Answer · 2020-09-15T10:42:05.243

1

Try this;

Cmd = "cmd.exe /K ""C:\Users\admin\Documents\ffmpeg\bin\ffmpeg.exe"" -i ""C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mxf"" -vcodec copy -acodec copy ""C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mp4"" 2> LogFile.txt"

Will equate to the command line;

cmd.exe /K "C:\Users\admin\Documents\ffmpeg\bin\ffmpeg.exe" -i "C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mxf" -vcodec copy -acodec copy "C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mp4" 2> LogFile.txt

The issue was caused by adding Chr(34) (a literal double quote) to the string when the double quotes had already been escaped by "" (doubling them).

Useful Links

Answer from About using Double quotes in Vbscript (Details how to use double quotes in strings).

edited Sep 15 '20 at 10:42

answered Sep 15 '20 at 10:30

user692942

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I have tried this, nothing happens it doesn't trigger the ffmpeg.I have also put the ffmpeg path in the environment variables Path. – user726720 Sep 15 '20 at 11:00
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@user726720 does it fix the initial error? You should be able to run that generated command line in `cmd.exe` and see what happens. I'm also assuming you have the other code that takes the `Cmd` variable and runs the command line (as you didn't include that in the original post but you still managed to suggest it errored). – user692942 Sep 15 '20 at 11:41
'objShell.Run Cmd, 10, True' this is part of my code, sorry i didn't include it in there. I will modify the question. I tried directly from the cmd it works just by omitting the cmd.exe from the above command. If i put cmd.exe and run from command prompt it doesnt work. Am I missing something. – user726720 Sep 15 '20 at 14:46
I got it working by removing the cmd.exe from the command and directly using ffmpeg as follows: `Cmd = "cmd.exe /k ffmpeg.exe -i ""C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mxf"" -vcodec copy -acodec copy ""C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mp4"""` Now the issue is how can i pipe this output to a text file. I tried using `2> LogFile.txt` but it doesn't seem to work. – user726720 Sep 15 '20 at 15:27
@user726720 you might find this helpful - [cmd.exe redirection operators order and position](https://stackoverflow.com/q/25559389) – user692942 Sep 15 '20 at 15:56

score 0 · Answer 2 · edited Sep 15 '20 at 13:00

0

You can quote your variables easily with this function DblQuote(str)

strcmd = "Cmd /K " & DblQuote("C:\Users\admin\Documents\ffmpeg\bin\ffmpeg.exe") & " -i "& DblQuote("C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mxf") &" -vcodec copy -acodec copy "& DblQuote("C:\Users\admin\Documents\TestFiles\3000012936-TXMHD.mp4") &" 2> LogFile.txt"
wscript.echo strcmd
'---------------------------------------
Function DblQuote(Str)
    DblQuote = Chr(34) & Str & Chr(34)
End Function
'---------------------------------------

edited Sep 15 '20 at 13:00

user692942

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answered Sep 15 '20 at 12:05

Hackoo

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Why is that easy? It's easier IMO, to just double the quotes and avoid any unnecessary concatenation altogether. – user692942 Sep 15 '20 at 12:23

FFMPEG from VBS

2 Answers2

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