The FFmpeg library of Audacity imports M4A (AAC), AC3 and WMA, a much larger range of audio formats than the program reads on its own.
AAC audio file to show notes in Russian
AAC audio file to show notes in Russian: send the file and get the text with the timecodes. One file may be up to 30 minutes on the free plan, no minute limit on Pro.
A Russian AAC audio file is read once and comes back as the show notes. The answer keeps the sections Episode summary, Chapters, Quotes and the time of every line, and the free plan gives 3 files a day of up to 30 minutes.
How to get the file and turn it into show notes
- 1
Check the codec of the file
AAC is MPEG-4 part3 and stands in the list of the audio formats of the VLC player next to MP3
- 2
Attach the recording
The engine takes the AAC audio file from the widget of the page; the speech is in Russian, and the show notes comes back with the timecodes.
- 3
Apply the instruction of the task
The instruction of the task asks for the show notes and puts the answer about the AAC audio file into the sections Episode summary, Chapters, Quotes; a claim that is not in the recording is not written.
- 4
Tell the engine what it hears
The engine reads 99+ languages; the speech of this AAC audio file is in Russian, and the widget carries that setting for the show notes.
- 5
Check the file before the upload
In the FAQ of the FFmpeg library the M4A is written next to the codec it carries: M4A (AAC), AC3 and WMA
What comes back from the engine
- TXT
One segment per line, the way a person wrote it down. It is the format to paste into a ticket, a chat or a document.
- TXT, CSV
The start and the end time of every segment, and the speakers named separately when you ask for it.
- SRT, VTT
SRT and VTT with the time of every line, so the recording can carry its own subtitles.
- Markdown, DOCX
The transcript is edited through the API and exported as Markdown for a wiki, or as DOCX for a review.
What AAC keeps, and what it says about it
The VLC player reads AAC among the audio formats it plays: AAC is MPEG-4 part3 and stands next to MP3 in the list.
The Telegram Bot API takes an audio file in the .MP3 or .M4A format, and the M4A carries the AAC codec.
In the table of the codecs and the containers of OBS Studio the AAC row names the MP4, MOV, MKV and TS containers.
In the FAQ of the FFmpeg library the M4A is written next to the codec it carries: M4A (AAC), AC3 and WMA.
up to 30 minutes on the free plan, no minute limit on Pro
$0: 3 files a day, up to 30 minutes per file, no card
$10 a month when you pay yearly ($120 a year), or $20 a month
What the recording does not give you
The VLC player reads AAC among the audio formats it plays: AAC is MPEG-4 part3 and stands next to MP3 in the list. The AAC audio file is only the input: the engine reads the Russian speech and writes the show notes out of the transcript.
Tips
Send the transcript to the instruction only once.
The engine does not translate the AAC audio file from Russian.
Check who may download the file of the AAC audio file.
Because of software patents Audacity cannot include the FFmpeg software: the free FFmpeg library of a third party is installed separately.
Bots can currently send audio files of up to 50 MB in size, and the limit may be changed in the future.
Questions about AAC audio file and show notes
What does the AAC say about the AAC audio file?
The Telegram Bot API takes an audio file in the .MP3 or .M4A format, and the M4A carries the AAC codec. The engine reads the Russian speech of the AAC audio file and writes the show notes from that text.
Which problems can come with the AAC audio file?
Because of software patents Audacity cannot include the FFmpeg software: the free FFmpeg library of a third party is installed separately. The engine does not change the file of the AAC audio file; it reads it as it is and writes the show notes.
How is the show notes built from the AAC audio file?
The engine reads the Russian speech and the instruction writes the show notes in the sections Episode summary, Chapters, Quotes; every line comes from the transcript of the AAC audio file.
How long may the file be, and how much is free?
One file may be up to 30 minutes on the free plan, and the free plan gives 3 files a day for the show notes.
Where does the file of the AAC audio file wait?
On the AAC. The facts of the table above name the place where the file of the AAC audio file is kept and the way it comes off.
Related pages
The same task on another recording, with the same steps and the same sections.
Podcast episode to show notesThe page of the task: the instruction that is written for it and an example of the answer.
Transcribe audio to textWhat the service does with a file: the formats of the export, the limits and the plans.
Sources
- MAudacity manual: FFmpeg Import/Export Library (read 2026-10-25)manual.audacityteam.org · checked
- WVLC features: the formats it plays (read 2026-10-25)www.videolan.org · checked
- CTelegram Bot API (read 2026-10-25)core.telegram.org · checked
- OOBS Knowledge Base: Audio and Video Formats Guide (read 2026-10-25)obsproject.com · checked
- TTranscription service page (read 2026-10-25)transcrib.si · checked
Drop a recording — the text arrives in a minute
Speakers by name, a time on every line, export to TXT, SRT, VTT, CSV and Markdown.