Can Ecasound Process Audio in Archive Formats?

Ecasound cannot natively open or process audio files contained directly inside archive formats like ZIP, TAR, or 7z. However, users can achieve real-time processing without manually extracting files to disk by leveraging standard UNIX streams, standard input pipes, and virtual filesystem mounts. This guide explains how Ecasound interacts with compressed audio, why archive containers are unsupported natively, and the direct methods used to process archived audio streams seamlessly.

Native Archive Support in Ecasound

Ecasound is designed as a digital audio workstation and audio processing utility that interfaces directly with sound cards, audio servers (such as JACK and ALSA), and dedicated audio file formats. While it natively handles compressed audio codecs—including MP3, Ogg Vorbis, and FLAC—it does not include file decompression engines for generic archive containers such as .zip, .tar.gz, or .7z. Specifying an archive path directly as an input (-i:archive.zip/song.wav) will result in an input error.

Method 1: Using Standard Input (Piping)

The most direct way to feed archived audio into Ecasound without extracting it to disk is through standard input (stdin). You can extract the audio file directly to standard output and pipe it into Ecasound.

For an audio file inside a ZIP archive:

unzip -p collection.zip track01.wav | ecasound -i stdin -o alsa

For an audio file inside a TAR archive:

tar -xOf collection.tar track01.flac | ecasound -i stdin -o alsa

When using standard input, ensure the audio format supports streaming. While uncompressed WAV or standard FLAC streams work reliably through standard input, random-access features (like seeking forward or backward in the track) will be disabled.

Method 2: Process Substitution

In modern shells such as Bash or Zsh, process substitution allows you to treat the output of an extraction command as a temporary file descriptor. This often provides better compatibility with Ecasound's input parser:

ecasound -i <(unzip -p collection.zip track01.wav) -o alsa

Method 3: Using Archivemount (FUSE)

If you need full transport control, such as seeking or processing multiple tracks simultaneously from an archive, mount the archive as a virtual filesystem using archivemount:

  1. Mount the archive: 
    mkdir /tmp/archive_mount
archivemount collection.zip /tmp/archive_mount
  2. Process the audio directly using standard file inputs: 
    ecasound -i /tmp/archive_mount/track01.wav -efl:1000 -o alsa
  3. Unmount the archive when finished: 
    fusermount -u /tmp/archive_mount

Using a FUSE-based mount gives Ecasound direct read access to the files inside the archive as if they were standard files, preserving seeking capabilities while keeping the host disk free of extracted files.