Ubuntu – Ffmpeg batch convert files

batchconvertffmpegjoin;

I have a folder that contains audio files, files are in sequence named from 1 to 150 but none of the files have file extension.
What I want is to convert them to aac or.mp3 and If I can join them as a one audio file that I will be fantastic.

Can some one help me out with this??

Thank you in advanced

Best Answer

get a recent, real `ffmpeg` build

The fake version in the repository from the Libav fork can not do this. You can download a Linux build of ffmpeg or follow a step-by-step guide to compile ffmpeg.

concatenate/join/combine the audio

Generally the concat demuxer or the concat filter can be used if all of the inputs are similar, but that may be difficult with so many inputs of various formats and properties. Usually I tend to avoid creating temporary files since the concat demuxer or the concat filter alone usually work, but perhaps you can encode them to PCM in WAV and then use the concat demuxer. Assuming there are only audio files in the directory, and your audio files are in ~/Desktop/test:

$ cd ~/Desktop/test
$ mkdir audio
$ for f in *; do ffmpeg -i "$f" -acodec pcm_s16le -ar 44100 -ac 2 audio/"$f".wav; done
$ for f in audio/*.wav; do echo "file '$f'" >> mylist.txt; done
$ ffmpeg -loglevel error -f concat -i mylist.txt -acodec libmp3lame -aq 4 -metadata title="Your Title" -metadata author="Levan" output.mp3

Related Solutions

Ubuntu – How to convert all pdf files to text (within a folder) with one command

The following will convert all files in the current directory:

for file in *.pdf; do pdftotext "$file" "$file.txt"; done

Ubuntu – How to batch convert images to b/w while preserving the folder structure

We can use convert command to convert images to black & white:

convert -colorspace GRAY image.png b-w_image.png

Where image.png is the input image and b-w_image.png is output imgage.

Combining this command with find we can create a bash one liner to convert all the images found under parent directory.

How-to:
Open terminal by hitting Ctrl+Alt+T, cd to parent/main directory and run the following command:

for img in $(find . -iname '*.png'); do echo -n "Converting $img"; convert -colorspace GRAY $img $img && echo ' [Done]'; done

It will convert and overwrite all the images under parent directory. I will suggest to test it on some temporary images and if you're satisfied with the results than run it on actual images.