`Hello! I'm using TrackEgress to stream an audio t...
# ask-aif
fierce-television-48756
08/19/2025, 7:16 AMHello! I'm using TrackEgress to stream an audio track (audio/opus) to my Node.js server via WebSocket. My server receives the audio chunks fine.When I pipe these chunks to an ffmpeg child process using "-i pipe:0", ffmpeg crashes with the error: "Error opening input: Invalid data found when processing input".My ffmpeg command is: ffmpeg -i pipe:0 -f s16le -ar 16000 -ac 1 pipe:1What is the exact container format (e.g., Ogg) of the WebSocket stream from TrackEgress? What are the correct ffmpeg input flags (like -f and -c:a) required to reliably decode this stream from stdin?t
tall-airline-16756
08/19/2025, 7:16 AMThanks for reaching out, Priyanshu. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.
tall-airline-16756
08/19/2025, 7:17 AMHey there! Just wanted to share some info about the WebSocket stream from TrackEgress — it uses raw PCM data as the container format. Here’s the lowdown:
• Format: pcm_s16le (that’s signed 16-bit little endian PCM)
• Sample rate: Usually 48kHz
• Channels: Stereo (2 channels)
If you want to decode this stream using ffmpeg, you can use these input flags:
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ffmpeg -f s16le -ac 2 -ar 48000 -i pipe:0