How to convert multiple mp3 files to mp4 with ffmpeg?

Question

The following command takes the mp3, attaches an image to it, and converts it to an mp4:

ffmpeg -i input.mp3 -loop 1 -i image.png -c:a copy -c:v libx264 -shortest output.mp4

I'm trying to apply the same image to each mp3 in a folder. The operating system is windows 8 and the desired output for the file is mp4.

I need to do this for all the mp3s in a folder. How would I code this?

P.S. I'm also in need of the code that can attach an intro mp4 to multiple mp4 files in a folder.

Answer 1

1. Create a file and save it with .bat extension
2. Write the code below in it. (specify the right image file)
3. Copy the batch file in the directory containing your .mp3 files.
4. Assuming the path to ffmpeg.exe is set in your environment variables, execute the batch file
5. Locate converted files in the created folder "converted".

---

@echo off
mkdir converted
for %%a in ("*.mp3") do ffmpeg -i "%%a" -loop 1 -i image.png -c:a copy -c:v libx264 -shortest "converted\%%~na.mp4"
pause

Answer 2

Assuming bog-standard Windows cmd.exe (ie no lovely cygwin, or Powershell, or <insert scripting language here>):

for %f in (*.mp3) do ffmpeg -i %f -loop 1 -i image.png -c:a copy -c:v libx264 -shortest %~nf.mp4

(also assumes not in a batch file; if that is the case the %s need doubled to %%)

Uses the fact that you can read in the current file (or directory, etc depending on what arguments you pass to for) to a single-character variable; which you can then get the basename of via %~n.

So, assuming your mp3s and image.png are in your Downloads folder as per your comment:

1. Start a command prompt: <windows key>+r --> cmd --> <enter>
2. Change to Downloads directory: cd Downloads
3. Run the looped ffmpeg command: for %f in (*.mp3) do ffmpeg -i %f -loop 1 -i image.png -c:a copy -c:v libx264 -shortest %~nf.mp4
4. (optional) Enjoy mp4 versions of your mp3s with the image

Answer 3

You could do this sort of thing with using a scripting language. Here's a little Ruby script that should do the job, if you run it in the folder containing the .mp3 files and the image.png:

Dir.glob("*.mp3").each do |file|
    system("ffmpeg -i #{file} -loop 1 -i image.png -c:a copy -c:v libx264 -shortest output.mp4")
end