Speech-to-text audio too large? Sume STT takes up to 10 MB, hosted

Sume's stt_create tool takes a public HTTPS audio_url, preferably on the Sume media host, and the tool schema caps the file at 10 MB; a non-Sume host fails with unsupported_audio_source. A 16 kHz mono 16-bit wav is about 32 KB per second, so 10 MB holds a little over five minutes of wav, and roughly twice that as 128 kbps mp3. The words always come back in words[], and speech-to-text is listed at $0.01 per audio minute in the catalog.

Size by format

Sume's audio detach guide calls 16000 plus channels: "mono" the speech-to-text shape and says the default wav is pcm_s16le. That is 16,000 samples a second at 2 bytes each. Its mp3 option is 128 kbps, which is 16,000 bytes a second. These are calculated from those published figures, not measured.

Cutting a long recording

Detach the audio of a long video once, then split it into ranges with timeline audio, which returns up to 20 ranges per job at $0.01 per job and keeps each as its own durable file. Transcribe each range separately and add the range's start time to its word times when you stitch the results back together.

Audio detach itself returns at most 900 seconds per job, so a recording longer than 15 minutes needs a range anyway.