kkroening / ffmpeg-python, Hacker News

**************************** [dev] **************************** (******************** Quickstart

Flip a video horizontally:

import ffmpeg stream=(ffmpeg.input)

‘ (input.mp4) ********************************** [dev] **********************

) stream=ffmpeg.hflip (stream) stream=(ffmpeg.output) stream, ' (output.mp4) ********************************** [0] **********************) ffmpeg.run (stream)
Or if you prefer a fluent interface:
import  ffmpeg (     ffmpeg     .input (
' (input.mp4)  '
)     .hflip ()     .output (
' (output.mp4)  '
)     .run () )
**********************************
********************** API) reference
********************************** () ************[0]  Complex filter graphs
FFmpeg is extremely powerful, but its command-line interface gets really complicated rather quickly - especially when working with signal graphs and doing anything more than trivial.
Take for example a signal graph that looks like this:
************
The corresponding command-line arguments are pretty gnarly:
ffmpeg -i input.mp4 -i overlay.png -filter_complex*  [0] trim=start_frame=(************************************************************************************************************************************************************:: end_frame=20 [v0];    (**********************************  [0] trim=start_frame=(*************************************************************************************************************************************************: end_frame=[v1]; [v0] [v1] concat=n=2 [v2]; [1] hflip [v3];  
[v2] [v3] overlay=eof_action=repeat [v4]; [v4] drawbox=(****************************************************************************************************************************************: (****************************************************************************************************************************************:  [0] ********************************************************************************************************************: red: t=5 [v5]  ()
     -map [v5] output.mp4
Maybe this looks great to you, but if you're not an FFmpeg command-line expert, it probably looks alien.
If you're like me and find Python to be powerful and readable, it's easier with  (ffmpeg-python) :

import  ffmpeg  in_file=(ffmpeg.input)

' (input.mp4) ********************************** [dev] **********************

) overlay_file=(ffmpeg.input)
' (overlay.png) ********************************** [dev] **********************
) (     ffmpeg     .concat (         in_file.trim (start_frame  (******************************** (= 10
,  (end_frame) **********************************
=(******************************************************************************************************************************************************
,         in_file.trim (start_frame  (******************************** (= (************************************************************************************************************************************************
,  (end_frame)=



),     )     .overlay (overlay_file.hflip ())     .drawbox (
********************************************************************************************************************************** (**********************************,
,  0361 (****************************, ********************************** 0361 (****************************, ********************************** (color)=
' (red)  '
(**********************************, ********************************** (thickness) ************************************  (=
(5)      .output (
' (out.mp4)  '
)     .run () )


ffmpeg-pythontakes care of running  (ffmpeg)  with the command-line arguments that correspond to the above filter diagram, in familiar Python terms.
(****************************


Real-world signal graphs can get a heck of a lot more complex, but  (ffmpeg-python)  handles arbitrarily large (directed-acyclic) signal graphs.

****************************************

******************************** (Installation

The latest version offfmpeg-pythoncan be acquired via a typical pip install :  (********************************** [dev]  pip install ffmpeg-python

Or the source can be cloned and installed from locally:

git clone git@github.com: kkroening / ffmpeg-python.git pip install -e ./ffmpeg-python**************************************

****************************************

When in doubt, take a look at the  examplesto see if there's something that's close to whatever you're trying to do.
Here are a few:

(Convert video to numpy array


(Generate thumbnail for video) ********************


Read raw PCM audio via pipe


(JupyterLab / Notebook stream editor)

**********************************************  [v2] ************** [dev] Tensorflow / DeepDream streaming

	

			
	

			


		
			
			
					
			
		





************************************************

See the  (Examples READMEfor additional examples.)

********************************************************

************************************Custom Filters

Don't see the filter you're looking for? While  ffmpeg-pythonincludes shorthand notation for some of the most commonly used filters (such as  (concat) ), all filters can be referenced via the. filter  (operator:

stream=(ffmpeg.input)

******************' (dummy.mp4) ********************************** [0] **********************) stream=(ffmpeg.filter) stream, ' (fps) ********************************** [dev] **********************

,fps  [dev] ************************==********************************  29 (****************************, ********************************** (round) ************************************=
(******************************** ()  (up)  '
) stream=(ffmpeg.output) stream, ' (dummy2.mp4) ********************************** [0] **********************) ffmpeg.run (stream)
Or fluently:
(     ffmpeg     .input (
' (dummy.mp4)  '
)     .filter (
' (fps)  '
************************************, **************************** (fps) =****************************************  (************************************************************************************************************************************************,  (round) ********************************** [0] **********************=


********************************* (up) ********************************** '

)     .output (
' (dummy2.mp4)  '
)     .run () )
Special option names:
Arguments with special names such as- qscale: v(variable bitrate),  - b: v [dev] ******************** (constant bitrate), etc. can be specified as a keyword-args dictionary as follows:
(     ffmpeg     .input (
' (in.mp4)  '
)     .output (
' (out.mp4)  '
************************************, **************************************** ({
) ********************************** [0] ************************ (qscale: v) ********************************* (')
:  (3) })     .run () )
(Multiple inputs:
Filters that take multiple input streams can be used by passing the input streams as an array to  (ffmpeg.filter) :
main
=(ffmpeg.input)
******************' (main.mp4) ********************************** [0] **********************) logo
=(ffmpeg.input)
' logo.png  [dev] **********************
) (     ffmpeg     .filter ([main, logo],*  (overlay) ******************************** ''
(************************, **************************************
,  (************************************************************************************************************************************************************)     .output (
' (out.mp4)  '
)     .run () )
(Multiple outputs:
Filters that produce multiple outputs can be used with. filter_multi_output:
split=()     ffmpeg     .input (
' (in.mp4)  '
)     .filter_multi_output (
' (split)  '
)#or `.split () (
) (     ffmpeg     .concat (split [0], split [0]. reverse ())     .output (
' (out.mp4)  '
)     .run () )
(In this particular case,. split ()is the equivalent shorthand, but the general approach works for other multi-output filters)
(String expressions:
Expressions to be interpreted by ffmpeg can be included as string parameters and reference any special ffmpeg variable names:
(     ffmpeg     .input (
' (in.mp4)  '
)     .filter (
' (crop)  '
************************************,' in_w-2  **************************************************************************************************************************************************************)
,
(in_h-2  ****************************************************************************************************************************************************
'    .input (
' (out.mp4)  '
) )
When in doubt, refer to the  (existing filters (*******************,  (examples, and / or the  (official ffmpeg documentation.
****************************************************** [v2] **********************
Frequently asked questions [0]. ******************
Why do I get an import / attribute / etc. error from
import ffmpeg?
Make sure you ranpip install ffmpeg-pythonand not  (pip install ffmpeg) ****************************** or  pip install python-ffmpeg.
(Why did my audio stream get dropped?
Some ffmpeg filters drop audio streams, and care must be taken to preserve the audio in the final output. The. Audio  and. videooperators can be used to reference the audio / video portions of a stream so that they can be processed separately and then re-combined later in the pipeline.
This dilemma is intrinsic to ffmpeg, and ffmpeg-python tries to stay out of the way while users may refer to the official ffmpeg documentation as to why certain filters drop audio.
As usual, take a look at the  (examples) ****************** ()  (Audio / video pipeline)  in particular).
How do I do XYZ?
Take a look at each of the links in the  Additional Resourcessection at the end of this README. If you look everywhere and can't find what you're looking for and have a question that may be relevant to other users, you may open an issue asking how to do it, while providing a thorough explanation of what you're trying to do and what you've tried so far.
Issues not directly related toffmpeg-pythonor issues asking others to write your code for you or how to do the work of solving a complex signal processing problem for you that's not relevant to other users will be closed.
That said, we hope to continue improving our documentation and provide a community of support for people using  ffmpeg-pythonto do cool and exciting things.
************************************************************** () **************************
(*********************************************************************** [dev]
One of the best things you can do to help makeffmpeg-python
better is to answer  (open questions)  in the issue tracker. The questions that are answered will be tagged and incorporated into the documentation, examples, and other learning resources.
If you notice things that could be better in the documentation or overall development experience, please say so in the  issue tracker. And of course, feel free to report any bugs or submit feature requests.
Pull requests are welcome as well, but it wouldn't hurt to touch base in the issue tracker or hop on the  (Matrix chat channel) ******************** (first.) ********************
Anyone who fixes any of theopen bugsor implementsrequested enhancementsis a hero, but changes should include passing tests. (******************************************************************************** [dev] ****************************
Running tests
git clone git@github.com: kkroening / ffmpeg-python.git  cd  ffmpeg-python virtualenv venv (**********************************. ********************************** venv / bin / activate
#  (OS X / Linux)
venv   b  in ********************************  activate
************************************ (#) ********************************** (Windows)
pip install -e. [dev] pytest*************************************(**********************************************************************************  (**************************************Special thanks(Fabrice Bellard) *********************

The FFmpeg team

Arne de Laat *******************

Davide Depau  (************************************

(Dim) *******************

Noah Stier  (****************************************************************************************************************************

************** (Additional Resources) (API Reference)

Examples****************************

(Filters***************************************************

FFmpeg Homepage  (************************************************

(FFmpeg Documentation) ******************

FFmpeg Filters Documentation************************************************

Test cases

(Issue tracker)


Matrix Chat:# ffmpeg-python: matrix.org

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