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Paraformer audio file recognition best practices

Preprocess video files to speed up Paraformer audio file recognition.

Paraformer models are available only in the China North 2 (Beijing) region. Use an API key created in that region. See Regions and endpoints.

Preprocess video files to improve file transcription efficiency (for audio file recognition scenarios)

Paraformer speech recognition API is compatible with video files, but they are typically large and time-consuming to transfer. Pre-process video files by extracting the audio track needed for speech recognition and compressing it to significantly reduce file size and improve transcription throughput. Use ffmpeg for pre-processing.

Prerequisites

Install ffmpeg from ffmpeg.org.

Pre-process video files

Use ffmpeg to extract the first audio track, downsample to 16kHz, and compress with opus encoding. 
ffmpeg -i input-video-file -ac 1 -ar 16000 -acodec libopus output-audio-file.opus
The output audio file will be significantly smaller than the input video. Submit the audio file (via URL) to the file transcription API for speech recognition results.