A call recorded as AMR can become a text with timestamps: send it to Potok in Telegram, 1 file at a time. Long silence on hold still occupies its place on the timeline, so expect gaps between stamps. Match 2 lines to the recording to confirm.
Get the text of your recording
Open @potok_now_bot in Telegram, attach the recording and wait: the transcript arrives as a message in the same chat.
Open @potok_now_bot in Telegram
Up to 2 GB per file · speaker labels and timestamps · six export formats · about 30 languages
Key facts
- Android lists AMR-NB in 3GPP (.3gp) and AMR (.amr) files at 4.75 to 12.2 kbps sampled at 8 kHz.
- AMR-NB has eight modes with bit rates between 4.75 and 12.2 kbps.
- AMR speech encoding works on 20 ms frames of 160 samples at 8 kHz.
- Send .amr files up to 2 GB as they are: Potok decodes them without a separate conversion.
AMR at a glance
| Property | Value |
|---|---|
| Kind | Speech codec for mobile phones |
| File extensions | .amr, .awb |
| What it holds | Adaptive Multi-Rate speech: AMR-NB (.amr) and AMR-WB (.awb) |
How to get timestamps for AMR files
- Send the AMR file to the bot. In Telegram, open @potok_now_bot and attach the .amr file to the chat. Larger recordings, up to 2 GB, go through the Upload button in the bot's mini app.
- Mind this about the format. AMR speech encoding works on 20 ms frames of 160 samples at 8 kHz.
- Switch on timestamps. Open the other-format options under the result, turn on timestamps (speaker labels can be added there too) and check three marks against the sound.
- Prepare this format. AMR is a narrowband speech format sampled at 8 kHz, so the sound is flat; check the first minute of the result.
What time marks look like
[00:00] Speaker 1: Hey, I'm running late, the bus is stuck.
[00:12] Speaker 1: Start the movie without me, I'll catch up.
[00:31] Speaker 1: Save me a seat near the door.
[00:58] Speaker 1: I will pick up the kids from school this afternoon.
Lines written by us to show the layout. They are not output from a real AMR file.
| Option | What it means |
|---|---|
| Size limit | 2 GB per file |
| Translation | No translation: the text stays in the language of the recording |
| Digest | Press the summary button under a finished transcript for a short digest |
| What you can send | Voice messages, audio and video |
| Typing by voice | The separate desktop app of Potok dictates into any program; it recognises Russian speech |
Where AMR files go wrong
| Slip | Result | Remedy |
|---|---|---|
| Expecting AMR stamps in sample counts | Frames are tiny, so counts are useless for finding a line | Use the minutes and seconds in the text |
| Sending an AMR call with long silence on hold | Stamps jump across empty parts and look confusing | Trim the hold time or ignore the silent gaps |
| Converting AMR to another format between steps | The converted file may start a little later, shifting stamps | Use the transcript with the same AMR you sent |
| Removing silent gaps from stamps to make the text shorter | Timeline no longer matches the call you recorded | Leave the stamps as given and only shorten the wording |
Where to look next
Need a converter or a calculator? Open the tools. Unsure about a term? Check the glossary. Apps are on the download page.
Questions and answers
Does Potok accept AMR files?
Yes. The bot accepts .amr files up to 2 GB, so no conversion is needed first.
Do the time marks depend on the AMR format?
The marks point to a place in the recording so you can find it again. Check a few against the sound before you quote them.
Which apps and devices create AMR files?
Android MediaRecorder offers an AMR_NB output format (Android MediaRecorder AMR_NB).
Sources
The dates show when each source was opened. Pages are edited over time; read the original before you rely on a detail.
- RFC 4867: RTP payload format and file storage format for AMR and AMR-WB, IETF · checked
- Supported media formats, Android Developers · checked
Check it on a file of your own
Send your voice message, audio or video to @potok_now_bot on Telegram and the text comes back in the chat.
Go to @potok_now_bot in Telegram