Transcribe a long SPX file Speex calls, years later.
A long SPX file holds Speex voice audio at roughly 8 to 28 kbps, which is about 3.6 to 12.6 MB per hour, so ten hours stays under 130 MB and the only limit you meet is 10 hours per file. It transcribes at about 2 minutes per audio hour; the first 20 minutes are free and a 6-hour call log fits the $6 pack of 500 minutes.
SPX, worked out
Speex was made to squeeze voices down the thinnest connection. The files are tiny.
What Speex was for
Speex is an open voice codec from the early VoIP years, used by internet calling software, voice chat and some dictation apps, usually stored in an Ogg container with the extension .spx. It has since been superseded by Opus, so most SPX files you find today are archives: old call recordings, voice notes and recorded conference lines.
Megabytes, not gigabytes
At 8 kbps narrowband, an hour is 8,000 bits a second times 3,600 seconds, divided by 8: 3.6 MB. Wideband Speex near 28 kbps is about 12.6 MB an hour. Ten hours tops out around 126 MB, so the 2 GB and 5 GB lines never come into it; length is the only limit.
Opening an old format
Drop the SPX on the upload page. If the upload refuses the file, convert it to MP3 first; ffmpeg reads Speex in Ogg, and the conversion keeps every word the codec kept.
Old calls, made readable
Hours of recorded calls or dictation come back with a brief, timed chapters, the names, numbers and dates said on the line, and the questions the conversation answered. The people on the call are identified and named in the summary, key quotes and chapters.
Why SPX archives sit unread
The recordings survived. The software that made them mostly did not.
✗ A codec nobody ships any more
Most players and upload forms no longer recognise .spx, and narrowband calls defeat tools tuned for studio audio.
- Players that cannot open the file
- Upload forms that reject the extension
- Phone-band audio read as noise
- Hours of calls with no index
- Converting each file before anything else
- No record of what was agreed
✓ The archive, as text
The SPX goes in whole; the call comes back on one timeline.
- 10 hours per file, any size it is
- Done at about 2 minutes per audio hour
- 20 minutes free before any pack
- $6 for 500 minutes, one time
- Chapters for each topic on the call
- TXT, Word, captions and JSON
Sample
A recorded project call, three hours long.
This illustrative sample was written for the page; no real call was used. Each timestamp shows where a remark sits in a long SPX recording.
Export
One transcript. Five clean formats.
Every pack exports all five — no format is held back for a higher tier.
Plain text
De-ummed paragraphs. Ready to paste.
SRT captions
Timed to the speech. Every video editor reads this.
WebVTT
HTML5 player + YouTube uploads.
Show notes
Formatted with chapters and pull-quotes.
Machine-readable
Timestamped text for your own tools.
Pricing
Honest pricing, no surprises.
A pack from $6 (500 minutes) opens the full transcript. After that, no subscription and no auto-renew — every tier is a one-time minute pack, and credits never expire. Buy once, use the minutes whenever you need them.
Casual pack
$6/500 min
8 hours of audio — $0.72 an hour. One-time — credits never expire.
- 500 minutes of audio
- All export formats
- Unlimited AI chat per transcript
- Executive summary & key quote
Best value
$12/2,000 min
33 hours of audio — $0.36 an hour. Credits never expire.
- 2,000 minutes of audio
- Priority queue
- All export formats
- Unlimited AI chat per transcript
Bulk pack
$24/5,000 min
83 hours of audio — $0.29 an hour. Credits never expire.
- 5,000 minutes of audio
- Priority queue
- API access for batch pipelines
- All export formats
FAQ
Long SPX files, the common questions.
How long does a long SPX file take to transcribe?
About 2 minutes per audio hour, so a 6-hour call log is ready in around 12 minutes. A file this small uploads in seconds on most connections.
What does an archive of Speex recordings cost?
Six hours is 360 minutes, which fits the $6 pack of 500 with 140 to spare. Forty hours of old calls is 2,400 minutes, past the $12 pack's 2,000, so it goes on the $24 pack of 5,000 minutes.
How big is an SPX file per hour?
About 3.6 MB at 8 kbps, 7.2 MB at 16 kbps and 12.6 MB at 28 kbps. Even the widest Speex setting keeps ten hours far under the 2 GB that uploads before a pack.
Narrowband calls sound muffled. Will they transcribe?
Phone-band Speex carries the voice frequencies that matter for words, so clear speech comes through. Crosstalk, a bad line or heavy compression artefacts lower the quality, so check names and figures against the audio. An SPX that runs beyond 10 hours is uploaded as two halves.
Which languages are recognised?
99, detected automatically, so a call in Japanese, Hebrew or Spanish needs no setting. A call that moves between English and Tagalog is handled on its main language.
What exports come back, and is the recording kept private?
A Speex call exports to TXT, DOCX, SRT, VTT or JSON. Speex calls are transcribed on our own servers and are never used for training, and a recording can be deleted with its transcript whenever you like.
Related
Other small voice formats
Upload the SPX. 20 minutes on us to start.
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