Creating a batch file with the "IF" command

Question

I have created a little batch file for helping people to convert MP4 video to FLV with FFMPEG. A way to make it simple to everyone i know to use it. I was thinking the line i've put in was perfect for every situation (converting a MP4 file to FLV), but few days ago, it didn't work for a file. (audio sample to high for FLV format)

I found with the help of people a other codeline to convert it, but i don't know how to correctly integrate it, in my batch file.

There is what i use right now :

echo "Enter the name of the file, whitout the extension" : set /p namefile=

echo "Enter the name you what to give to the destination file" : set /p destinationfile=

ffmpeg -i %namefile%.mp4 -c:v libx264 -crf 19 %destinationfile%.flv

And i want to add a "IF". Because if that doesn't work with this line, use that one :

ffmpeg -i %namefile%.mp4 -c:v libx264 -ar 22050 -crf 28 %destinationfile%.flv

How can i do that ?

Thank you very much for your help and if i'm unclear on something, just tell it to me and i will do my best to make it clear.

Thanks !

Answer 1

I'm not sure if FFMPEG returns a standard error code in case of failure, but if it does, you can use the following:

ffmpeg -i %namefile%.mp4 -c:v libx264 -crf 19 %destinationfile%.flv
if not errorlevel 1 goto Done
ffmpeg -i %namefile%.mp4 -c:v libx264 -ar 22050 -crf 28 %destinationfile%.flv
:Done

If this approach doesn't work, you can check the existence of the destination file to determine further action:

ffmpeg -i %namefile%.mp4 -c:v libx264 -crf 19 %destinationfile%.flv
if exist %destinationfile%.flv goto Done
ffmpeg -i %namefile%.mp4 -c:v libx264 -ar 22050 -crf 28 %destinationfile%.flv
:Done

Hope one of these works.

Answer 2

Similar to EitanT's first solution, but without using GOTO.

ffmpeg -i %namefile%.mp4 -c:v libx264 -crf 19 %destinationfile%.flv
if errorlevel 1 ffmpeg -i %namefile%.mp4 -c:v libx264 -ar 22050 -crf 28 %destinationfile%.flv

or
Edited - the code had gotten truncated, all fixed now

ffmpeg -i %namefile%.mp4 -c:v libx264 -crf 19 %destinationfile%.flv||ffmpeg -i %namefile%.mp4 -c:v libx264 -ar 22050 -crf 28 %destinationfile%.flv

Similar to EitanT's second solution, but without using GOTO

ffmpeg -i %namefile%.mp4 -c:v libx264 -crf 19 %destinationfile%.flv
if not exist %destinationfile%.flv ffmpeg -i %namefile%.mp4 -c:v libx264 -ar 22050 -crf 28 %destinationfile%.flv