Step 2: Go running on your system, type cmd, and hit on the Enter key. Step 3: You will now get a command-line window at which you need to write at the “cd\” and press enter. Next, to enter the FFmpegTool folder, you need to write “cd FFmpegTool.”. Step 4: Next, enter the command for converting WebM to MP3-. Only -c copy option can guarantee the input and output streams has the same data / duration:. ffmpeg -i "%1" -c copy %~dpn1.wav Any codec conversion (like skipping -c option entirely or use any other option than -c copy) can lead you to some differences between input and output. 5. I have WAV data that I'd like to convert to MP3 on the fly with a PHP script. The WAV file originates with the script, so it does not start out as a file. I can run something like this: exec ( "lame --cbr -b 32k in.wav out.mp3" ); But this will require that I first write in.wav to disk, read out.mp3 from disk, and then clean up when I'm ffmpeg -i myvideo.mp4 audio.mp3 FFmpeg normally audo-detects the output format from the extension you enter for the output files, so specifying the format/codec is not needed in most cases. But if you do want to specify the codec, add -codec:a libmp3lame to convert to mp3: ffmpeg -i myvideo.mp4 -codec:a libmp3lame audio.mp3 I use the following command to convert m4a format to mp3. ffmpeg -i audio.m4a -acodec libmp3lame audio.mp3 I've 32 x86 cores, however libmp3lame processes in a single thread. I know libmp3lame does not support multithreading, thus I'm open to other alternates that can be executed in ubuntu CLI. Mono 8000Hz. effective bitrate of 13.6. I need to convert these to MP3. Current I am forced to send the file first through sox: sox input.wav -s input-pcm.wav. Then through lame: lame input-pcm.wav output.mp3. There are a couple of problems with this a 1MB file takes 5s and the MP3 sounds like crap. ffmpeg -i image.jpg -i audio.mp3 -c:v libx264 -tune stillimage -c:a copy out.mp4 -i image.jpg -i audio.mp3: Image and audio inputs-c:v libx264: use x264 to encode video.-tune stillimage: x264 setting to optimize video for still image encoding-c:a copy: copies the codec used for the input audio. You may change this if you want a different audio I have a folder with various media files such as .m4a, .aac, .mp4, etc. and I want to invoke FFMPEG to convert them all to .mp3 using the basic FFMPEG command ffmpeg -i myfile.m4a myfile.mp3. Can you show me a basic example of what this .bat text file would look like? I would like to iterate each media file using a type of wildcard so that it Assuming you're trying to convert the output into MP3, you need something that can handle transcoding the audio. There are a number of tools available, but my personal preference is FFmpeg . It's a command line tool so you will need to take that into account, but otherwise it's very easy to use. I want to use FFmpeg to convert FLAC to MP3; meanwhile, change the channel from stereo to mono and set the bitrate to 320kb/s. It is easy to do with the following command: ffmpeg -i test_audio.flac -ac 1 -ab 320k output.mp3. For sure, FFmpeg is a great tool for processing multimedia files with command lines. J2ws.