A cross-platform, OpenCV-based VFX shot detection program and Python library.
Project description
VFX Shot Detection Tool (detects VFX shot code burnins)
Latest Release: v0.6.3 (June 07, 2021)
Quick Install: To install PyVfxShotDetect via pip with all dependencies:
pip install vfxdetect
This is an extended version of PySceneDetect v0.5.5. The complete PySceneDetect manual can be found here
To enable video splitting support, you will also need to have mkvmerge or ffmpeg installed - see the pyscenedetect documentation on Video Splitting Support for details.
Requires Python modules click, numpy, OpenCV cv2, pytesseract and (optional) tqdm for displaying progress. For details, see the PySceneDetect dependencies .
Quick Start (Command Line):
Analyse a video (detect all cuts) and export an EDL:
vfxdetect -i video.mp4 detect-content export-edl
Analyse a video and export an EDL only containing VFX Shots (based on detected VFX shot code burnins). Prior to analysing the video, the video is played and the user is asked to define a boundary box (rectangle that encloses a VFX shot code burnin) which helps vfxdetect to find the VFX shots and extract the VFX shot codes) In addition to the edl, a .bbox file (text file) containing the boundary box coordinates is stored next to the input video file:
vfxdetect -i video.mp4 detect-content export-vfx-edl
Analyse a video and export an EDL only containing VFX shots plus specifying a file containing boundary box coordinates:
vfxdetect -i video.mp4 detect-content export-vfx-edl -bb bbox-file.txt
To show a summary of all other options and commands:
vfxdetect help
You can find more examples on the PySceneDetect website or in the PySceneDetect manual.
Python API: See the PySceneDetect manual for the full PySceneDetect API documentation.
PyVfxShotDetect is a command-line tool and Python library, which uses OpenCV to analyze a video to find scene changes or cuts. If ffmpeg or mkvmerge is installed, the video can also be split into scenes automatically. A frame-by-frame analysis can also be generated for a video, to help with determining optimal threshold values or detecting patterns/other analysis methods for a particular video. See the PySceneDetect Usage documentation for details.
There are two main detection methods PyVfxShotDetect uses: detect-threshold (comparing each frame to a set black level, useful for detecting cuts and fades to/from black), and detect-content (compares each frame sequentially looking for changes in content, useful for detecting fast cuts between video scenes, although slower to process). Each mode has slightly different parameters, and is described in detail below.
In general, use detect-threshold mode if you want to detect scene boundaries using fades/cuts in/out to black. If the video uses a lot of fast cuts between content, and has no well-defined scene boundaries, you should use the detect-content mode. Once you know what detection mode to use, you can try the parameters recommended below, or generate a statistics file (using the -s / --statsfile flag) in order to determine the correct paramters - specifically, the proper threshold value.
Note that PyVfxShotDetect is currently in beta; see Current Features & Roadmap below for details.
For help or other issues, you can submit an issue/bug report here on Github.
Usage
Global Options
PyVfxShotDetect Option/Command List:
----------------------------------------------------
Usage: vfxdetect [OPTIONS] COMMAND1 [ARGS]... [COMMAND2 [ARGS]...]...
For example:
vfxdetect -i video.mp4 -s video.stats.csv detect-content list-scenes
Note that the following options represent [OPTIONS] above. To list the
optional [ARGS] for a particular COMMAND, type `vfxdetect help COMMAND`.
You can also combine commands (e.g. vfxdetect [...] detect-content save-
images --png split-video).
Options:
-i, --input VIDEO [Required] Input video file. May be specified
multiple times to concatenate several videos
together. Also supports image sequences and URLs.
-o, --output DIR Output directory for all files (stats file, output
videos, images, log files, etc...).
-f, --framerate FPS Force framerate, in frames/sec (e.g. -f 29.97).
Disables check to ensure that all input videos have
the same framerates.
-d, --downscale N Integer factor to downscale frames by (e.g. 2, 3,
4...), where the frame is scaled to width/N x
height/N (thus -d 1 implies no downscaling). Each
increment speeds up processing by a factor of 4 (e.g.
-d 2 is 4 times quicker than -d 1). Higher values can
be used for high definition content with minimal
effect on accuracy. [default: 2 for SD, 4 for 720p, 6
for 1080p, 12 for 4k]
-fs, --frame-skip N Skips N frames during processing (-fs 1 skips every
other frame, processing 50% of the video, -fs 2
processes 33% of the frames, -fs 3 processes 25%,
etc...). Reduces processing speed at expense of
accuracy. [default: 0]
-m, --min-scene-len TIMECODE
Minimum size/length of any scene. TIMECODE can
be specified as exact number of frames, a time
in seconds followed by s, or a timecode in the
format HH:MM:SS or HH:MM:SS.nnn [default: 0.6s]
--drop-short-scenes Drop scenes shorter than `--min-scene-len`
instead of combining them with neighbors
-s, --stats CSV Path to stats file (.csv) for writing frame metrics
to. If the file exists, any metrics will be
processed, otherwise a new file will be created. Can
be used to determine optimal values for various scene
detector options, and to cache frame calculations in
order to speed up multiple detection runs.
-v, --verbosity LEVEL Level of debug/info/error information to show.
Setting to none will suppress all output except that
generated by actions (e.g. timecode list output).
-l, --logfile LOG Path to log file for writing application logging
information, mainly for debugging. Make sure to set
"-il debug" as well if you are submitting a bug
report.
-q, --quiet Suppresses all output of PySceneDetect except for
those from the specified commands. Equivalent to
setting "--info-level none", and overrides the
current info-level, even if --info-level/-il is
specified.
-h, --help Show this message and exit.
Command List
Commands:
about Print license/copyright info.
detect-content Perform content detection algorithm on input...
detect-threshold Perform threshold detection algorithm on...
export-html Exports scene list to a HTML file.
export-edl Exports scene list to an EDL file.
export-vfx-edl Exports scene list to an EDL file (VFX shots only).
help Print help for command (help [command]).
list-scenes Prints scene list and outputs to a CSV file.
save-images Create images for each detected scene.
split-video Split input video(s) using ffmpeg or...
time Set start/end/duration of input video(s).
version Print version of PySceneDetect.
time Command
PyVfxShotDetect time Command
----------------------------------------------------
Usage: vfxdetect time [OPTIONS]
Set start/end/duration of input video(s).
Time values can be specified as frames (NNNN), seconds (NNNN.NNs), or as a
timecode (HH:MM:SS.nnn). For example, to start scene detection at 1
minute, and stop after 100 seconds:
time --start 00:01:00 --duration 100s
Note that --end and --duration are mutually exclusive (i.e. only one of
the two can be set). Lastly, the following is an example using absolute
frame numbers to process frames 0 through 1000:
time --start 0 --end 1000
Options:
-s, --start TIMECODE Time in video to begin detecting scenes. TIMECODE
can be specified as exact number of frames (-s 100
to start at frame 100), time in seconds followed by
s (-s 100s to start at 100 seconds), or a timecode
in the format HH:MM:SS or HH:MM:SS.nnn (-s 00:01:40
to start at 1m40s). [default: 0]
-d, --duration TIMECODE Maximum time in video to process. TIMECODE format
is the same as other arguments. Mutually exclusive
with --end / -e.
-e, --end TIMECODE Time in video to end detecting scenes. TIMECODE
format is the same as other arguments. Mutually
exclusive with --duration / -d.
-h, --help Show this message and exit.
detect-content Command
PyVfxShotDetect detect-content Command
----------------------------------------------------
Usage: vfxdetect detect-content [OPTIONS]
Perform content detection algorithm on input video(s).
detect-content
detect-content --threshold 27.5
Options:
-t, --threshold VAL Threshold value (float) that the delta_hsv frame
metric must exceed to trigger a new scene.
Refers to frame metric delta_hsv_avg in stats
file. [default: 30.0]
-h, --help Show this message and exit.
detect-threshold Command
PyVfxShotDetect detect-threshold Command
----------------------------------------------------
Usage: vfxdetect detect-threshold [OPTIONS]
Perform threshold detection algorithm on input video(s).
detect-threshold
detect-threshold --threshold 15
Options:
-t, --threshold VAL Threshold value (integer) that the delta_rgb
frame metric must exceed to trigger a new scene.
Refers to frame metric delta_rgb in stats file.
[default: 12]
-f, --fade-bias PERCENT Percent (%) from -100 to 100 of timecode skew
for where cuts should be placed. -100 indicates
the start frame, +100 indicates the end frame,
and 0 is the middle of both. [default: 0]
-l, --add-last-scene If set, if the video ends on a fade-out, an
additional scene will be generated for the last
fade out position.
-p, --min-percent PERCENT Percent (%) from 0 to 100 of amount of pixels
that must meet the threshold value in orderto
trigger a scene change. [default: 95]
-b, --block-size N Number of rows in image to sum per iteration
(can be tuned for performance in some cases).
[default: 8]
-h, --help Show this message and exit.
list-scenes Command
PyVfxShotDetect list-scenes Command
----------------------------------------------------
Usage: vfxdetect list-scenes [OPTIONS]
Prints scene list and outputs to a CSV file. The default filename is
$VIDEO_NAME-Scenes.csv.
Options:
-o, --output DIR Output directory to save videos to. Overrides global
option -o/--output if set.
-f, --filename NAME Filename format to use for the scene list CSV file.
You can use the $VIDEO_NAME macro in the file name.
Note that you may have to wrap the name using single
quotes. [default: $VIDEO_NAME-Scenes.csv]
-n, --no-output-file Disable writing scene list CSV file to disk. If set,
-o/--output and -f/--filename are ignored.
-q, --quiet Suppresses output of the table printed by the list-
scenes command.
-s, --skip-cuts Skips outputting the cutting list as the first row in
the CSV file. Set this option if compliance with RFC
4810 is required.
save-images Command
PyVfxShotDetect save-images Command
----------------------------------------------------
Usage: vfxdetect save-images [OPTIONS]
Create images for each detected scene.
Options:
-o, --output DIR Output directory to save images to. Overrides global
option -o/--output if set.
-f, --filename NAME Filename format, *without* extension, to use when
saving image files. You can use the $VIDEO_NAME,
$SCENE_NUMBER, $IMAGE_NUMBER, and $FRAME_NUMBER macros in the file
name. Note that you may have to wrap the format in
single quotes. [default: $VIDEO_NAME-
Scene-$SCENE_NUMBER-$IMAGE_NUMBER]
-n, --num-images N Number of images to generate. Will always include
start/end frame, unless N = 1, in which case the image
will be the frame at the mid-point in the scene.
-j, --jpeg Set output format to JPEG. [default]
-w, --webp Set output format to WebP.
-q, --quality Q JPEG/WebP encoding quality, from 0-100 (higher
indicates better quality). For WebP, 100 indicates
lossless. [default: JPEG: 95, WebP: 100] [0<=x<=100]
-p, --png Set output format to PNG.
-c, --compression C PNG compression rate, from 0-9. Higher values produce
smaller files but result in longer compression time.
This setting does not affect image quality, only file
size. [default: 3] [0<=x<=9]
-m, --frame-margin N Number of frames to ignore at the beginning and end of
scenes when saving images [default: 1]
-s --scale S Optional factor by which saved images are rescaled. A
scaling factor of 1 would not result in rescaling. A
value <1 results in a smaller saved image, while a
value >1 results in an image larger than the original.
This value is ignored if either the height, -h, or
width, -w, values are specified.
-h --height H Optional value for the height of the saved images.
Specifying both the height and width, -w, will resize
images to an exact size, regardless of aspect ratio.
Specifying only height will rescale the image to that
number of pixels in height while preserving the aspect
ratio.
-w --width W Optional value for the width of the saved images.
Specifying both the width and height, -h, will resize
images to an exact size, regardless of aspect ratio.
Specifying only width will rescale the image to that
number of pixels wide while preserving the aspect ratio.
split-video Command
PyVfxShotDetect split-video Command
----------------------------------------------------
Usage: vfxdetect split-video [OPTIONS]
Split input video(s) using ffmpeg or mkvmerge.
Options:
-o, --output DIR Output directory to save videos to. Overrides
global option -o/--output if set.
-f, --filename NAME File name format, to use when saving image files.
You can use the $VIDEO_NAME and $SCENE_NUMBER
macros in the file name. Note that you may have
to wrap the name using single quotes.
[default: $VIDEO_NAME-Scene-$SCENE_NUMBER]
-h, --high-quality Encode video with higher quality, overrides -f
option if present. Equivalent to specifying
--rate-factor 17 and --preset slow.
-a, --override-args ARGS Override codec arguments/options passed to FFmpeg
when splitting and re-encoding scenes. Use double
quotes (") around specified arguments. Must
specify at least audio/video codec to use (e.g. -a
"-c:v [...] and -c:a [...]"). [default: "-c:v
libx264 -preset veryfast -crf 22 -c:a copy"]
-q, --quiet Suppresses output from external video splitting
tool.
-c, --copy Copy instead of re-encode using mkvmerge instead
of ffmpeg for splitting videos. All other
arguments except -o/--output and -q/--quiet are
ignored in this mode, and output files will be
named $VIDEO_NAME-$SCENE_NUMBER.mkv. Significantly
faster when splitting videos, however, output
videos sometimes may not be split exactly,
especially if the scenes are very short in length,
or the input video is heavily compressed. This can
lead to smaller scenes being merged with others,
or scene boundaries being shifted in time - thus
when using this option, the number of videos
written may not match the number of scenes that
was detected.
-crf, --rate-factor RATE Video encoding quality (x264 constant rate
factor), from 0-100, where lower values represent
better quality, with 0 indicating lossless.
[default: 22, if -h/--high-quality is set: 17]
-p, --preset LEVEL Video compression quality preset (x264 preset).
Can be one of: ultrafast, superfast, veryfast,
faster, fast, medium, slow, slower, and veryslow.
Faster modes take less time to run, but the output
files may be larger. [default: veryfast, if
-h/--high quality is set: slow]
export-html Command
PyVfxShotDetect export-html Command
----------------------------------------------------
Usage: vfxdetect.py export-html [OPTIONS]
Exports scene list to a HTML file. Requires save-images by default.
Options:
-f, --filename NAME Filename format to use for the scene list HTML
file. You can use the $VIDEO_NAME macro in the
file name. Note that you may have to wrap the
the format name using single quotes.
[default: $VIDEO_NAME-Scenes.html]
--no-images Export the scene list including or excluding the
saved images.
-w, --image-width pixels Width in pixels of the images in the resulting
HTML table.
-h, --image-height pixels Height in pixels of the images in the resulting
HTML table.
export-edl Command
PyVfxShotDetect export-edl Command
----------------------------------------------------
Usage: vfxdetect.py export-edl [OPTIONS]
Exports scene list to an EDL file.
Options:
-f, --filename NAME Filename format to use for the scene list EDL
file. You can use the $VIDEO_NAME macro in the
file name. Note that you may have to wrap the
the format name using single quotes.
[default: $VIDEO_NAME.edl]
export-vfx-edl Command
PyVfxShotDetect export-vfx-edl Command
----------------------------------------------------
Usage: vfxdetect.py export-vfx-edl [OPTIONS]
Exports scene list to an EDL file. EDL events are reduced to VFX Shots.
VFX Shots are detected by text detection. This requires a bounding box
specified in a text file with first line containing bbox data like
"[55, 32, 227, 77]". The bounding box is a list of coordinates which build a
rectangle arround VFX Shotcode burnin: [ul-x, ul-y, lr-x, lr-y].
If no .bbox file is specified a cv2 player will be shown and bbox can be
selected.
Options:
-bb, --bbox-filename NAME Textfile containing bbox coordinates in this
format: "[55, 32, 227, 77]".
-f, --filename NAME Filename format to use for the scene list EDL
file. You can use the $VIDEO_NAME macro in the
file name. Note that you may have to wrap the
the format name using single quotes.
[default: $VIDEO_NAME.edl]
----------------------------------------------------------
Licensed under BSD 3-Clause (see the LICENSE file for details).
Copyright (C) 2021-2021 Thomas Weckenmann. All rights reserved.
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