So for your example, the command to get an MP3 file that contains only the first audio stream from your input would be: ffmpeg -i 2.webm -map 0:a:0 out.mp3. Alternatively, you could tell ffmpeg to not include video streams using the -vn option; but I like to be explicit. Your command would then be: ffmpeg -i 2.webm -vn out.mp3. I want to compile FFMPEG to support conversion from MP3 to WAV and WAV to MP3. as I only need that task, and output compiled size is really matter to me, Please correct me best compile config that accompilesh my requirement. here is full config file: FFmpeg can take input of raw audio types by specifying the type on the command line. For instance, to convert a "raw" audio type to a ".wav" file: The default for muxing into WAV files is pcm_s16le. You can change it by specifying the audio codec and using the WAV file extension: which will create a WAV file containing audio with that codec I am using python with pyav, ffmpeg to decode mp3 in the memory. I know there is some other way to do it, like the pipe ffmpeg command. However, I would like to explore pyav and ffmpeg API. So I have the following code. It works but the sound is very noisy, although hearable: I have a lot of wav files (each with respective names) that need to be converted from wav to mp3 and I have been trying to write a batch file to do this. I'm using the latest nightly build of ffmpeg on Windows 10 Insider build. I've looked through the ffmpeg documentation but can't find anything on this. I'm using the following basic ffmpeg commend to convert a WAV file to an MP4. ffmpeg -i response.wav -s 1980x1080 -c:a aac -b:a 128k aNewVideo.mp4. This is great, however I'd like to include a black background on the mp4 file, and as it stands this doesn't add ANY background (see below). I am working on a php function to upload a .wav and also create an .mp3 version of it in the same folder. So far everything is working how it should except for when I try using: shell_exec('ffmpe Using ffmpeg there are several methods that I know of to go from stereo to two individual mono files, or two mono streams in one file: stereo to 2 mono outputs-map_channel option ffmpeg -i stereo.wav -map_channel 0.0.0 left.wav -map_channel 0.0.1 right.wav pan audio filter uPaTU.

convert mp3 to wav ffmpeg