Automagically synchronize subtitles with video.

Stephen Macke

Last update: Jan 6, 2023

Related tags

Video audio sync synchronization video ffmpeg captions subtitles caption alignment fast-fourier-transform subtitle vad vlc srt fft vlc-media-player srt-subtitles voice-activity-detection speech-detection string-alignment

Overview

FFsubsync

Language-agnostic automatic synchronization of subtitles with video, so that subtitles are aligned to the correct starting point within the video.

Turn this:	Into this:

Helping Development

At the request of some, you can now help cover my coffee expenses using the Github Sponsors button at the top, or using the below Paypal Donate button:

Install

First, make sure ffmpeg is installed. On MacOS, this looks like:

brew install ffmpeg

(Windows users: make sure ffmpeg is on your path and can be referenced from the command line!)

Next, grab the script. It should work with both Python 2 and Python 3:

pip install ffsubsync

If you want to live dangerously, you can grab the latest version as follows:

pip install git+https://github.com/smacke/ffsubsync@latest

Usage

ffs, subsync and ffsubsync all work as entrypoints:

ffs video.mp4 -i unsynchronized.srt -o synchronized.srt

There may be occasions where you have a correctly synchronized srt file in a language you are unfamiliar with, as well as an unsynchronized srt file in your native language. In this case, you can use the correctly synchronized srt file directly as a reference for synchronization, instead of using the video as the reference:

ffsubsync reference.srt -i unsynchronized.srt -o synchronized.srt

ffsubsync uses the file extension to decide whether to perform voice activity detection on the audio or to directly extract speech from an srt file.

Sync Issues

If the sync fails, the following recourses are available:

Try to sync assuming identical video / subtitle framerates by passing --no-fix-framerate;
Try passing --gss to use golden-section search to find the optimal ratio between video and subtitle framerates (by default, only a few common ratios are evaluated);
Try a value of --max-offset-seconds greater than the default of 60, in the event that the subtitles are out of sync by more than 60 seconds (empirically unlikely in practice, but possible).
Try --vad=auditok since auditok can sometimes work better in the case of low-quality audio than WebRTC's VAD. Auditok does not specifically detect voice, but instead detects all audio; this property can yield suboptimal syncing behavior when a proper VAD can work well, but can be effective in some cases.

If the sync still fails, consider trying one of the following similar tools:

sc0ty/subsync: does speech-to-text and looks for matching word morphemes
kaegi/alass: rust-based subtitle synchronizer with a fancy dynamic programming algorithm
tympanix/subsync: neural net based approach that optimizes directly for alignment when performing speech detection
oseiskar/autosubsync: performs speech detection with bespoke spectrogram + logistic regression
pums974/srtsync: similar approach to ffsubsync (WebRTC's VAD + FFT to maximize signal cross correlation)

Speed

ffsubsync usually finishes in 20 to 30 seconds, depending on the length of the video. The most expensive step is actually extraction of raw audio. If you already have a correctly synchronized "reference" srt file (in which case audio extraction can be skipped), ffsubsync typically runs in less than a second.

How It Works

The synchronization algorithm operates in 3 steps:

Discretize both the video file's audio stream and the subtitles into 10ms windows.
For each 10ms window, determine whether that window contains speech. This is trivial to do for subtitles (we just determine whether any subtitle is "on" during each time window); for the audio stream, use an off-the-shelf voice activity detector (VAD) like the one built into webrtc.
Now we have two binary strings: one for the subtitles, and one for the video. Try to align these strings by matching 0's with 0's and 1's with 1's. We score these alignments as (# video 1's matched w/ subtitle 1's) - (# video 1's matched with subtitle 0's).

The best-scoring alignment from step 3 determines how to offset the subtitles in time so that they are properly synced with the video. Because the binary strings are fairly long (millions of digits for video longer than an hour), the naive O(n^2) strategy for scoring all alignments is unacceptable. Instead, we use the fact that "scoring all alignments" is a convolution operation and can be implemented with the Fast Fourier Transform (FFT), bringing the complexity down to O(n log n).

Limitations

In most cases, inconsistencies between video and subtitles occur when starting or ending segments present in video are not present in subtitles, or vice versa. This can occur, for example, when a TV episode recap in the subtitles was pruned from video. FFsubsync typically works well in these cases, and in my experience this covers >95% of use cases. Handling breaks and splits outside of the beginning and ending segments is left to future work (see below).

Future Work

Besides general stability and usability improvements, one line of work aims to extend the synchronization algorithm to handle splits / breaks in the middle of video not present in subtitles (or vice versa). Developing a robust solution will take some time (assuming one is possible). See #10 for more details.

History

The implementation for this project was started during HackIllinois 2019, for which it received an Honorable Mention (ranked in the top 5 projects, excluding projects that won company-specific prizes).

Credits

This project would not be possible without the following libraries:

ffmpeg and the ffmpeg-python wrapper, for extracting raw audio from video
VAD from webrtc and the py-webrtcvad wrapper, for speech detection
srt for operating on SRT files
numpy and, indirectly, FFTPACK, which powers the FFT-based algorithm for fast scoring of alignments between subtitles (or subtitles and video)
Other excellent Python libraries like argparse, rich, and tqdm, not related to the core functionality, but which enable much better experiences for developers and users.

License

Code in this project is MIT licensed.

Comments

ffmpeg._run.Error: ffprobe error

While trying to run the program in Arch Linux 64 bit I see this error :

INFO:subsync.subsync:computing alignments...
INFO:subsync.speech_transformers:extracting speech segments from subtitles...
Traceback (most recent call last):
  File "/home/nirjhor/.local/bin/subsync", line 11, in <module>
    load_entry_point('subsync==0.2.10', 'console_scripts', 'subsync')()
  File "/home/nirjhor/.local/lib/python3.7/site-packages/subsync/subsync.py", line 74, in main
    reference_pipe.fit_transform(args.reference)
  File "/home/nirjhor/.local/lib/python3.7/site-packages/sklearn/pipeline.py", line 393, in fit_transform
    return last_step.fit_transform(Xt, y, **fit_params)
  File "/home/nirjhor/.local/lib/python3.7/site-packages/sklearn/base.py", line 553, in fit_transform
    return self.fit(X, **fit_params).transform(X)
  File "/home/nirjhor/.local/lib/python3.7/site-packages/subsync/speech_transformers.py", line 54, in fit
    total_duration = float(ffmpeg.probe(fname)['format']['duration']) - self.start_seconds
  File "/home/nirjhor/.local/lib/python3.7/site-packages/ffmpeg/_probe.py", line 23, in probe
    raise Error('ffprobe', out, err)
ffmpeg._run.Error: ffprobe error (see stderr output for detail)

What I tried:

Installing as user in pip
reinstalling subsync
tried with --encoding utf-8 & utf-16

What I expect to happen:

The program should run

What happens:

I see the above-mentioned error

bug

opened by fakeid30 21

There has been an error in the syncing process

FAILED.txt

Additional context Using the script rsubsync.py to sync all subtitles in a folder. Most files get synced properly, but every few episodes a error seems to pop up. Screenshot

Any ideas? Is this just because i'm syncing too many subtitles?
out-of-sync

opened by maxtheking 13
About Python2 and Windows 10

I tried it on my MPB with Python2 first and it failed. But it worked fine with Python3 an I used it on a whole movie file (more than 1 GB in size and 130 minutes long). Also, i tried it on Windows but couldn't install it. So, will it ever support Windows 10?
bug

opened by Suleman-Elahi 11
Video file appears to lack subtitle stream

Hello,

I am using the linuxserver bazarr docker image. I have subtitle synchonization turned on. No matter what I do It gives me this error. Even when using ffsubsync in custom processing. I've been on the discord servers of linuxserver and bazarr. This is a ffsubsync issue so that's why I'm posting this issue.

I transcode my files with tdarr to remove embedded subtitles from the containers. So the mkv files contain no subtitles whatsoever. I just want to sync my external .srt files downloaded by bazarr.

Does anyone know what this error means and how to fix it?

Thanks in advance.

out-of-sync

opened by Shawn9347 10
use cchardet to autodetect text encodings

ref: https://github.com/PyYoshi/cChardet

While we're at it, it probably makes sense to change the default output encoding to utf-8, since this seems to be what players like VLC expect.
enhancement

opened by smacke 10
$TypeError: \>\ not supported between instances of \float\ and \NoneType\$
TypeError: \>\ not supported between instances of \float\ and \NoneType\
Environment (please complete the following information):

OS: Windows Server 2019 Datacenter (with desktop experience)

python version: Python 3.8.5

subsync version: Embedded in latest version of Bazaar (0.9.0.2)

Describe the bug After sub download in Bazarr, an error is thrown when calling the synchronization of the service. Appears to happen for all requests

To Reproduce Download a subtitle in Bazarr with the synchronize subtitle option selected

Expected behavior A successful run of the subsync process

Output BAZARR an exception occurs during the synchronization process for this subtitles \nas.domain.net\nas\media\TV\The Dukes of Hazzard\The Dukes of Hazzard Season 1\The Dukes of Hazzard - S01E08 - The Big Heist WEBRip-1080p.en.srt Traceback (most recent call last): File "p:\apps\bazarr\bazarr\subsyncer.py", line 46, in sync result = run(self.args) File "p:\apps\bazarr\bazarr\../libs\ffsubsync\ffsubsync.py", line 275, in run reference_pipe.fit(args.reference) File "p:\apps\bazarr\bazarr\../libs\ffsubsync\sklearn_shim.py", line 214, in fit self._final_estimator.fit(Xt, y, **fit_params) File "p:\apps\bazarr\bazarr\../libs\ffsubsync\speech_transformers.py", line 236, in fit if simple_progress + newstuff > total_duration: TypeError: >\ not supported between instances of \float\ and \NoneType\

Additional context Reported issue in the Bazaar discord, after speaking with morpheus65535, he recommended opening a issue on this repository for further investigation
bug
opened by acomick 9
Specify start time for processing?

It seems to me that if there's an introduction sequence to the video (theme song, etc), subsync keys off of audio for that and moves the sub timing too early.
Feature request here: Add an option to have subsync start its analysis at/after a specific timestamp?
enhancement

opened by schmitmd 9
future-annotations broken

python2 and 3 Could not find a version that satisfies the requirement future-annotations (from ffsubsync) (from versions: ) No matching distribution found for future-annotations (from ffsubsync)
bug

opened by francogrex 7
Unable to detect speech. Perhaps try specifying a different stream
Environment (please complete the following information):

OS: Windows 10 20H2 x86

python version 3.8.7 (also tested with python 2.7)

ffsubsync bundled with Bazarr Version: 0.9.0.7

Media files hosted on NAS via SMB

Describe the bug Running sync from within bazarr on a win32 machine any attempt to sync a file exits with an error:

Traceback (most recent call last): File "c:\program files\bazarr\bazarr\subsyncer.py", line 56, in sync result = run(self.args) File "c:\program files\bazarr\bazarr\../libs\ffsubsync\ffsubsync.py", line 283, in run reference_pipe.fit(args.reference) File "c:\program files\bazarr\bazarr\../libs\ffsubsync\sklearn_shim.py", line 214, in fit self._final_estimator.fit(Xt, y, **fit_params) File "c:\program files\bazarr\bazarr\../libs\ffsubsync\speech_transformers.py", line 250, in fit raise ValueError(

ValueError: Unable to detect speech. Perhaps try specifying a different stream / track, or a different vad.

To Reproduce Sync on any file causes above error. Have tried with AC3 DTS AAC

Expected behavior Sync file without error
bug
opened by andonevris 6
I get File not found (winerror2)

C:>ffs 1.mkv -i 1.smi -o sync.smi [02:15:16] INFO extracting speech segments from reference '1.mkv'... ffsubsync.py:282 INFO Checking video for subtitles stream... speech_transformers.py:172 INFO [WinError 2] 지정된 파일을 찾을 수 없습니다 speech_transformers.py:177 WARNING [WinError 2] 지정된 파일을 찾을 수 없습니다 speech_transformers.py:183 Traceback (most recent call last): File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\runpy.py", line 192, in _run_module_as_main return _run_code(code, main_globals, None, File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\runpy.py", line 85, in run_code exec(code, run_globals) File "C:\Users\pgh26\AppData\Local\Programs\Python\Python38-32\Scripts\ffs.exe_main.py", line 9, in File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\site-packages\ffsubsync\ffsubsync.py", line 387, in main return run(args)['retval'] File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\site-packages\ffsubsync\ffsubsync.py", line 283, in run reference_pipe.fit(args.reference) File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\site-packages\ffsubsync\sklearn_shim.py", line 214, in fit self._final_estimator.fit(Xt, y, **fit_params) File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\site-packages\ffsubsync\speech_transformers.py", line 211, in fit process = subprocess.Popen(ffmpeg_args, **subprocess_args(include_stdout=True)) File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\subprocess.py", line 854, in init self._execute_child(args, executable, preexec_fn, close_fds, File "c:\users\pgh26\appdata\local\programs\python\python38-32\lib\subprocess.py", line 1307, in _execute_child hp, ht, pid, tid = _winapi.CreateProcess(executable, args, FileNotFoundError: [WinError 2] 지정된 파일을 찾을 수 없습니다

C:>

I worked on drive C and I get a File Not found error

The path is correct and the file exists

I did it on Windows 10, Python 3.8, and I get the same result when I do it on another Windows 10 computer

I want to know how to solve it..
bug

opened by pgh268400 6
raise SRTParseError(expected_start, actual_start, unmatched_content)

Using Python 3.6.9 and the latest version of ffsubsync. Subtitles downloaded using subliminal. Subtitles are in Polish which usually means UTF-8. It works sometimes but it fails sometimes too.

One example:

Traceback (most recent call last): File "/root/subsync/bin/ffsubsync", line 8, in <module> sys.exit(main()) File "/root/subsync/lib/python3.6/site-packages/ffsubsync/ffsubsync.py", line 261, in main return run(args) File "/root/subsync/lib/python3.6/site-packages/ffsubsync/ffsubsync.py", line 117, in run for scale_factor in framerate_ratios File "/root/subsync/lib/python3.6/site-packages/ffsubsync/ffsubsync.py", line 117, in <listcomp> for scale_factor in framerate_ratios File "/root/subsync/lib/python3.6/site-packages/ffsubsync/sklearn_shim.py", line 212, in fit Xt, fit_params = self._fit(X, y, **fit_params) File "/root/subsync/lib/python3.6/site-packages/ffsubsync/sklearn_shim.py", line 177, in _fit **fit_params_steps[name]) File "/root/subsync/lib/python3.6/site-packages/ffsubsync/sklearn_shim.py", line 368, in _fit_transform_one res = transformer.fit_transform(X, y, **fit_params) File "/root/subsync/lib/python3.6/site-packages/ffsubsync/sklearn_shim.py", line 40, in fit_transform return self.fit(X, **fit_params).transform(X) File "/root/subsync/lib/python3.6/site-packages/ffsubsync/subtitle_parser.py", line 107, in fit raise exc File "/root/subsync/lib/python3.6/site-packages/ffsubsync/subtitle_parser.py", line 96, in fit start_seconds=self.start_seconds), File "/root/subsync/lib/python3.6/site-packages/ffsubsync/subtitle_parser.py", line 44, in _preprocess_subs next_sub = GenericSubtitle.wrap_inner_subtitle(next(subs)) File "/root/subsync/lib/python3.6/site-packages/srt.py", line 362, in parse _raise_if_not_contiguous(srt, expected_start, len(srt)) File "/root/subsync/lib/python3.6/site-packages/srt.py", line 387, in _raise_if_not_contiguous raise SRTParseError(expected_start, actual_start, unmatched_content) srt.SRTParseError: Expected contiguous start of match or end of input at char 0, but started at char 60576

Any idea how it can be fixed?
bug

opened by sevospl 6
cchardet no longer updated

cchardet, a dependency of ffsubsync is no longer supported, and will not build correctly on Python 3.11 on Windows 10. See: https://github.com/PyYoshi/cChardet/issues/77

charset_normalizer seems like a decent drop-in replacement others suggest
bug

opened by vevv 5

Framerate was not specified and cannot be read from the MicroDVD file error when used on a .sub file

Environment (please complete the following information):

OS: Windows 10 WSL Debian
python version 3.9.2
subsync version 0.4.20

Describe the bug I get a Framerate was not specified and cannot be read from the MicroDVD file. error when trying to use ffsubsync on a .sub file, although I used --frame-rate FRAMERATE to specify the frame-rate.

To Reproduce What I have tried:

ffs --frame-rate 31250 "video.mkv" -i "unsync.sub" -o "sync.sub"
ffs --frame-rate 31250 --skip-infer-framerate-ratio "video.mkv" -i "unsync.sub" -o "sync.sub"
ffs --frame-rate 31250 "reference.srt" -i "unsync.sub" -o "sync.sub"

Expected behavior Frame-rate should be read from the command line argument and the program should carry on.

Output

[13:16:58] INFO     extracting speech segments from reference 'video.mkv'...
           INFO     Checking video for subtitles stream...                                              speech_transformers.py:259
           INFO     Video file appears to lack subtitle stream                                          speech_transformers.py:264
100%|██████████████████████████████████████████████████████████████████████████████████▉| 5460.0/5460.051 [01:01<00:00, 88.96it/s]
[13:18:00] INFO     ...done                                                                                       ffsubsync.py:444
           INFO     extracting speech segments from subtitles file(s)                                             ffsubsync.py:134
                    ['unsync.sub']...
           INFO     detected encoding: WINDOWS-1252                                                          subtitle_parser.py:85
           ERROR    Framerate was not specified and cannot be read from the MicroDVD file.                        ffsubsync.py:223

bug

opened by Nicryc 0

A better VAD than webrtc

I saw this on hackernews it seems to be better at distinguishing noise and voice

https://thegradient.pub/one-voice-detector-to-rule-them-all/

https://github.com/snakers4/silero-vad

opened by Dnkhatri 2
Is ffsubsync support auto adjust subtitle duration

Subtitles from opensubtitle normally have correct texts, but their timestamps are ofhen messed up. Partially because aegisub used by most fansubbers is not user-friendly on timestamps adjustment.

Is ffsubsync support auto crop/extend subtitle entry display duration base on data from speech detection?

opened by cyzs233 1
output subtitles still out of sync

Tarball, generated via debug option in Bazarr: S01E02.mp4.2022-01-14-16-26-23.tar.gz

Additional context Attempted to sync this subtitles (in Bazarr), It seems strange to me why it didn't work because in the video at the start there's a "Previously on..." which is clearly out of sync with the subs which seem to me very easy to synchronize. Either way, good job with this library, I also has Spanish subs and they synchronized perfectly well!
out-of-sync

opened by Tau5 0

Releases(0.4.22)

0.4.22(Dec 31, 2022)

This release includes miscellaneous sync improvements, compatibility fixes, and other bugfixes. It also includes functionality for using a new algorithm, called "golden section search", for inferring the framerate ratio between the reference and input subtitles. To use, pass the --gss flag -- it may help in some cases where subtitles are still out of sync, if the issue is that the scaling is different from the predefined ratios ffsubsync tries.
Source code(tar.gz)
Source code(zip)
0.4.11(Jan 30, 2021)
Misc sync improvements:

Have webrtcvad use '0' as the non speech label instead of 0.5;

Allow the vad non speech label to be specified via the --non-speech-label command line parameter;

Don't try to infer framerate ratio based on length between first and last speech frames for non-subtitle speech detection;

Source code(tar.gz)
Source code(zip)
0.4.10(Jan 18, 2021)
Lots of improvements from PRs submitted by @alucryd (big thanks!):

Retain ASS styles;

Support syncing several subs against the same ref via --overwrite-input flag;

Add --apply-offset-seconds postprocess option to shift alignment by prespecified amount;

Filter out metadata in subtitles when extracting speech;

Add experimental --golden-section-search over framerate ratio (off by default);

Try to improve sync by inferring framerate ratio based on relative duration of synced vs unsynced;

Source code(tar.gz)
Source code(zip)
0.4.9(Jan 18, 2021)
Make default offset seconds 60 and enforce during alignment as opposed to throwing away alignments with > max_offset_seconds;

Add experimental section for using golden section search to find framerate ratio;

Restore ability to read stdin and write stdout after buggy permissions check;

Exceptions that occur during syncing were mistakenly suppressed; this is now fixed;

Source code(tar.gz)
Source code(zip)
0.4.8(Sep 23, 2020)
Allow MicroDVD input format;

Use output extension to determine output format;

Bugfix for writing subs to stdout;

Misc bugfixes and stability improvements;

Use webrtcvad-wheels on Windows to eliminate dependency on compiler (i.e., better Windows support);

Source code(tar.gz)
Source code(zip)
0.4.4(Jun 8, 2020)

Better Windows support, additional options for consuming tools, rich text console logging.
Source code(tar.gz)
Source code(zip)
v0.3.4(Mar 20, 2020)
Attempt speech extraction from subtitle tracks embedded in video first before using VAD;

Source code(tar.gz)
Source code(zip)
v0.3.2(Mar 13, 2020)
Add ability to merge synced and reference subs into bilingual subs when reference is srt;

Source code(tar.gz)
Source code(zip)
v0.3.1(Mar 12, 2020)
Fix bug when handling ass/ssa input, this format should work now;

Source code(tar.gz)
Source code(zip)
v0.3.0(Mar 12, 2020)
Better detection of text file encodings;

ASS / SSA functionality (but currently untested);

Allow serialize speech with --serialize-speech flag;

Convenient --make-test-case flag to create test cases when filing sync-related bugs;

Use utf-8 as default output encoding (instead of using same encoding as input);

More robust test framework (integration tests!);

Source code(tar.gz)
Source code(zip)

Owner

Stephen Macke

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Automagically synchronize subtitles with video.

Related tags

Overview

FFsubsync

Helping Development

Install

Usage

Sync Issues

Speed

How It Works

Limitations

Future Work

History

Credits

License

Comments

Releases(0.4.22)

0.4.22(Dec 31, 2022)

0.4.11(Jan 30, 2021)

0.4.10(Jan 18, 2021)

0.4.9(Jan 18, 2021)

0.4.8(Sep 23, 2020)

0.4.4(Jun 8, 2020)

v0.3.4(Mar 20, 2020)

v0.3.2(Mar 13, 2020)

v0.3.1(Mar 12, 2020)

v0.3.0(Mar 12, 2020)

Owner

Stephen Macke

OpenShot Video Editor is an award-winning free and open-source video editor for Linux, Mac, and Windows, and is dedicated to delivering high quality video editing and animation solutions to the world.

video streaming userbot (vsu) based on pytgcalls for streaming video trought the telegram video chat group.

Streamlink is a CLI utility which pipes video streams from various services into a video player

MoviePy is a Python library for video editing, can read and write all the most common audio and video formats

A youtube video link or id to video thumbnail python package.

Text2Video's purpose is to help people create videos quickly and easily by simply typing out the video’s script and a description of images to include in the video.

Filtering user-generated video content(SberZvukTechDays)Filtering user-generated video content(SberZvukTechDays)

Extracting frames from video and create video using frames

Telegram Video Chat Video Streaming bot 🇱🇰

Play Video & Music on Telegram Group Video Chat

Takes a video as an input and creates a video which is suitable to upload on Youtube Shorts and Tik Tok (1080x1920 resolution).

Turn any live video stream or locally stored video into a dataset of interesting samples for ML training, or any other type of analysis.

Video-to-GIF-Converter - A small code snippet that can be used to convert any video to a gif

Video-stream - A telegram video stream bot repo

Terminal-Video-Player - A program that can display video in the terminal using ascii characters

Video processing routines for SciPy

High-performance cross-platform Video Processing Python framework powerpacked with unique trailblazing features :fire:

Boltstream Live Video Streaming Website + Backend

Real-time video and audio streams over the network, with Streamlit.