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Russian Open Speech To Text (STT/ASR) Dataset

Arguably the largest public Russian STT dataset up to date:

  • ~16m utterances (1-2m with less perfect annotation, see #7);
  • ~20 000 hours;
  • 2,3 TB (in .wav format in int16), 356G in .opus;
  • A new domain - public speech;
  • A huge Radio dataset update with 10 000+ hours;
  • (new!) Utils for working with OPUS;
  • (new!) New OPUS torrent;
  • (new!) New OPUS direct links;

Prove us wrong! Open issues, collaborate, submit a PR, contribute, share your datasets! Let's make STT in Russian (and more) as open and available as CV models.

Important - assume that ё everywhere is replaced with е.

Planned releases:

  • Working on a new project with 3 more languages, stay tuned!

Table of contents

Dataset composition

Dataset Utterances Hours GB Secs/chars Comment Annotation Quality/noise
radio_v4 7,603,192 10,430 1,195 5s / 68 Radio Align (*) 95% / crisp
public_speech 1,700,060 2,709 301 6s / 79 Public speech Align (*) 95% / crisp
audiobook_2 1,149,404 1,511 162 5s / 56 Books Align (*) 95% / crisp
radio_2 651,645 1,439 154 8s / 110 Radio Align (*) 95% / crisp
public_youtube1120 1,410,979 1,104 237 3s / 34 Youtube Subtitles 95% / ~crisp
public_youtube700 759,483 701 75 3s / 43 Youtube Subtitles 95% / ~crisp
tts_russian_addresses 1,741,838 754 81 2s / 20 Addresses TTS 4 voices 100% / crisp
asr_public_phone_calls_2 603,797 601 66 4s / 37 Phone calls ASR 70% / noisy
public_youtube1120_hq 369,245 291 31 3s / 37 YouTube HQ Subtitles 95% / ~crisp
asr_public_phone_calls_1 233,868 211 23 3s / 29 Phone calls ASR 70% / noisy
radio_v4_add 92,679 157 18 6s / 80 Radio Align (*) 95% / crisp
asr_public_stories_2 78,186 78 9 4s / 43 Books ASR 80% / crisp
asr_public_stories_1 46,142 38 4 3s / 30 Books ASR 80% / crisp
public_series_1 20,243 17 2 3s / 38 Youtube Subtitles 95% / ~crisp
asr_calls_2_val 12,950 7,7 2 2s / 34 Phone calls Manual annotation 99% / crisp
public_lecture_1 6,803 6 1 3s / 47 Lectures Subtitles 95% / crisp
buriy_audiobooks_2_val 7,850 4,9 1 2s / 31 Books Manual annotation 99% / crisp
public_youtube700_val 7,311 4,5 1 2s / 35 Youtube Manual annotation 99% / crisp
Total 16,513,202‬ 20,108 2,369


Update 2021-06-04

Added Zenodo direct link mirrors as well.

Update 2020-09-23

Now hosting a torrent via aria2c as well. Please use aria2c to download as well.

Update 2020-06-13

Now featured via Azure Datasets:

Update 2020-05-09

Legacy links and torrents deprecated

  • All legacy link and torrents deprecated
  • Please switch to new links and opus
  • Opus helpers are available in this repo

Update 2020-05-04

Opus direct links

  • Unlimited direct downloads via direct opus links

Update 2020-05-04

Migration to OPUS

  • Conversion of the whole dataset to OPUS
  • New OPUS torrent
  • Added OPUS helpers and build instructions
  • Coming soon - new unlimited direct downloads

Update 2020-02-07

Temporarily Deprecated Direct MP3 Links:

Update 2019-11-04

New train datasets added:

  • 10,430 hours radio_v4;
  • 2,709 hours public_speech;
  • 154 hours radio_v4_add;
  • 5% sample of all new datasets with annotation.
Click to expand

Update 2019-06-28

New train datasets added:

- 1,439 hours radio_2;
- 1,104 hours public_youtube1120;
- 291 hours public_youtube1120_hq;

New validation datasets added:

- 8 hours asr_calls_2_val;
- 5 hours buriy_audiobooks_2_val;
- 5 hours public_youtube700_val;

Update 2019-05-19

Also shared a wav version via torrent.

Update 2019-05-13

Added the forgotten txt files to mp3 archives. Updating the torrent.

Update 2019-05-12

Torrent created and uploaded to academictorrents.

Update 2019-05-10

Quickly converted the dataset to MP3 thanks to the community! Waiting for our account for academic torrents to be approved. v0.4 will boast MP3 download links.

Update 2019-05-07 Help needed!

If you want to support the project, you can:

  • Help us with hosting (create a mirror) / provide a reliable node for torrent;
  • Help us with writing some helper functions;
  • Donate (each coffee pays for several full downloads) / use our DO referral link to help;

We are converting the dataset to MP3 now. Please contact us using the below contacts, if you would like to help.


Via torrent

  • An MP3 version of the dataset (v3) DEPRECATED;
  • A WAV version of the dataset (v5) DEPRECATED;
  • A OPUS version of the dataset (v1.01);

You can download separate files via torrent.

Looks like that due to large chunk size, most conversional torrent clients just fail silently. No problem (re-calculating the torrent takes much time, and some people have downloaded it already), use aria2c:

apt update
apt install aria2
# list the torrent files
aria2c --show-files ru_open_stt_wav_v10.torrent
# download only one file
aria2c --select-file=4 ru_open_stt_wav_v10.torrent
# for more options visit

If you are using Windows, you may use Linux subsystem to run these commands.


Dataset GB, wav GB, archive Archive Source Manifest
radio_v4 1059 176 opus, txt Radio manifest
public_speech 257 47.4 opus, txt Internet + alignment manifest
radio_v4_add 15.7 2.8 opus, txt Radio manifest
5% of radio_v4 + public_speech - 11.4 opus+txt mirror - manifest
audiobook_2 162 25.8 opus+txt mirror Internet + alignment manifest
radio_2 154 24.6 opus+txt mirror Radio manifest
public_youtube1120 237 19.0 opus+txt mirror YouTube videos manifest
asr_public_phone_calls_2 66 9.4 opus+txt mirror Internet + ASR manifest
public_youtube1120_hq 31 4.9 opus+txt mirror YouTube videos manifest
asr_public_stories_2 9 1.4 opus+txt mirror Internet + alignment manifest
tts_russian_addresses_rhvoice_4voices 80.9 12.9 opus+txt mirror TTS manifest
public_youtube700 75.0 12.2 opus+txt mirror YouTube videos manifest
asr_public_phone_calls_1 22.7 3.2 opus+txt mirror Internet + ASR manifest
asr_public_stories_1 4.1 0.7 opus+txt mirror Public stories manifest
public_series_1 1.9 0.3 opus+txt mirror Public series manifest
public_lecture_1 0.7 0.1 opus+txt mirror Internet + manual manifest
asr_calls_2_val 2 0.8 wav+txt mirror Internet manifest
buriy_audiobooks_2_val 1 0.5 wav+txt mirror Books + manual manifest
public_youtube700_val 2 0.13 wav+txt mirror YouTube videos + manual manifest
Total 2,186 354

Download instructions

End to end

or with this config file. Please check the config first.


  1. Download each dataset separately:

Via wget


For multi-threaded downloads use aria2 with -x flag, i.e.

aria2c -c -x5

If necessary, merge chunks like this:

cat ru_open_stt_v01.tar.gz_* > ru_open_stt_v01.tar.gz
  1. Download the meta data and manifests for each dataset:
  2. Merge files (where applicable), unpack and enjoy!

Annotation methodology

The dataset is compiled using open domain sources. Some audio types are annotated automatically and verified statistically / using heuristics.

Audio normalization

All files are normalized for easier / faster runtime augmentations and processing as follows:

  • Converted to mono, if necessary;
  • Converted to 16 kHz sampling rate, if necessary;
  • Stored as 16-bit integers;

On disk DB methodology

Each audio file is hashed. Its hash is used to create a folder hierarchy for more optimal fs operation.

target_format = 'wav'
wavb = wav.tobytes()

f_hash = hashlib.sha1(wavb).hexdigest()

store_path = Path(root_folder,

Helper functions

Use helper functions from here for easier work with manifest files.

Read manifests

See example

from utils.open_stt_utils import read_manifest

manifest_df = read_manifest('path/to/manifest.csv')

Merge, check and save manifests

See example

from utils.open_stt_utils import (plain_merge_manifests,
train_manifests = [
train_manifest = plain_merge_manifests(train_manifests,

How to open opus

The best efficient way to read opus files in python (the we know of) that does incur any significant overhead (i.e. launching subprocesses, using a daisy chain of libraries with sox, FFMPEG etc) is to use pysoundfile (a python CFFI wrapper around libsoundfile).

When this solution was being researched the community had been waiting for a major libsoundfile release for years. Opus support has been implemented some time ago upstream, but it has not been properly released. Therefore we opted for a custom build + monkey patching.

At the time when you read / use this - probably there will be decent / proper builds of libsndfile.

Building libsoundfile

apt-get update
apt-get install cmake autoconf autogen automake build-essential libasound2-dev \
libflac-dev libogg-dev libtool libvorbis-dev libopus-dev pkg-config -y

cd /usr/local/lib
git clone
cd libsndfile
git reset --hard 49b7d61
mkdir -p build && cd build

make && make install
cmake --build .

Patched pysoundfile wrapper

Install pysoundfile pip install soundfile

import utils.soundfile_opus as sf

path = 'path/to/file.opus`
audio, sr =, dtype='int16')

Known issues

When you attempt writing large files (90-120s), there is an upstream bug in libsndfile that prevents writing such files with opus / vorbis. Most likely will be fixed by major libsndfile releases.


Please contact us here or just create a GitHub issue!

Authors (in alphabetic order):

  • Anna Slizhikova;
  • Alexander Veysov;
  • Diliara Nurtdinova;
  • Dmitry Voronin;


This repo would not be possible without these people:

  • Newest direct download links are a courtesy of Azure Open Datasets;
  • Many thanks for helping to encode the initial bulk of the data into mp3 to akreal;
  • 18 hours of ground truth annotation datasets for validation are a courtesy of activebc;



0. Why not MP3? MP3 encoding / decoding - DEPRECATED


Mostly we used pydub (via ffmpeg) or sox (much much faster way) to convert to MP3. We omitted blank files (YouTube mostly). We used the following parameters:

  • 16kHz;
  • 32 kbps;
  • Mono;

Usually 128-192 kbps is enough for music with sr of 44 kHz, 64-96 is enough for speech. But here we have mono, 16 kHz and usually only one speaker. So 32 kbps was a good choice. We did not use other formats like .ogg, because .mp3 is much more popular.

See example `pydub`

from pydub import AudioSegment

sound = AudioSegment.from_file(temp_path,

file_handle = sound.export(store_mp3_path,
                           parameters =["-ar", "{}".format(str(16000)),"-ac", "1"],

See example `sox`

import subprocess
cmd = 'sox "{}" -C 32.01 -c 1 "{}"'.format(
res =[cmd], shell=True)

if res != 0:
    print('Problems with {}'.format(wav_path))


It is up to you, but to save space and spare CPU during training, I would suggest the following pipeline to extract the files:

See example

# you can also use pydub, torchaudio, sox or whatever
# we ended up using scipy for speed
# this example also includes hashing step which is not necessary
import librosa
import hashlib
import numpy as np
from pathlib import Path
from import wavfile

def save_wav_diskdb(wav,
    assert type(wav) == np.ndarray
    assert wav.dtype == np.dtype('int16')
    assert len(wav.shape)==1

    target_format = 'wav'
    wavb = wav.tobytes()

    # f_path = Path(audio_path)
    f_hash = hashlib.sha1(wavb).hexdigest()

    store_path = Path(root_folder,



    return str(store_path)

root_folder = '../data/'
# save to int16, mono, 16 kHz to save space
target_dtype = np.dtype('int16')
target_sr = 16000
# librosa reads mp3
wav, sr = librosa.load(source_mp3_path,

# librosa converts to float32 by default
wav = (wav * 32767).astype(target_dtype) # cast to int

wav_path = save_wav_diskdb(wav,

Why not OGG/ Opus - DEPRECATED

Even though OGG / Opus is considered to be better for speech with higher compression, we opted for a more conventional well known format.

Also LPC net codec boasts ultra-low bitrate speech compression as well. But we decided to opt for a more familiar format to avoid worry about actually losing signal in compression.

1. Issues with reading files

Maybe try this approach:

See example

from import wavfile

sample_rate, sound =

abs_max = np.abs(sound).max()
sound = sound.astype('float32')
if abs_max>0:
    sound *= 1/abs_max

2. Why share such dataset?

We are not altruists, life just is not a zero sum game.

Consider the progress in computer vision, that was made possible by:

  • Public datasets;
  • Public pre-trained models;
  • Open source frameworks;
  • Open research;

STT does not enjoy the same attention by ML community because it is data hungry and public datasets are lacking, especially for languages other than English. Ultimately it leads to worse-off situation for the general community.

3. Known issues with the dataset to be fixed

  • Speaker labels coming soon;
  • Validation sets for new domains: Radio/Public Speech will be added in next releases.

4. Why migrate to OPUS?

After extensive testing, both during training and validation, we confirmed that converting 16kHz int16 data to OPUS does not at the very least degrade quality.

Also designed for speech, OPUS even at default compression rates takes less space than MP3 and does not introduce artefacts.

Some people even reported quality improvements when training using OPUS.



CC-BY-NC and commercial usage available after agreement with dataset authors.


Donate (each coffee pays for several full downloads) or via open_collective or just use our DO referral link to help.

Commerical inquiries

Further reading