Resize the video ffmpeg -y -i input.mkv -filter_complex scale=720:480 output.mp4 map 0:v selects the video streams from the first input (we have only one input file here anyway, marked by 0), while 0:a means the audio streams. Take only video or audio ffmpeg -y -i input.mkv -map 0:v output.mp4 Here, we specify the video and audio codecs with -vcodec and -acodec. It is common to use FFmpeg to transcode from one codec to another. Codec conversion ffmpeg -y -i input.mkv -vcodec libx264 -acodec flac output.mkv In addition to these two, FFmpeg supports many other popular multimedia file formats, including MXF, AVI, WAV, M4A, JPG, PNG etc. y denotes that we want to overwrite output.mp4 if it already exists.
Ffmpeg filter scale mp4#
In this simplest example, FFmpeg produces MP4 output from MKV input. Inp_con = ffmpeg.Format conversion ffmpeg -y -i input.mkv output.mp4 Mix_audios = ffmpeg.filter_(audios, 'amix') if len(audios) > 1 else audios setpts(f"PTS-STARTPTS+"))Į_frame = (e_frame.overlay(inp_f, x=(i * Factors().factors), y=(i * Factors().factors), eof_action='pass')) Inp_f = (inp.filter_multi_output('split') audios = Į_aud_src = rendering_helper.generate_empty_audio(0.1)
Ffmpeg filter scale how to#
Here I am mentioning an example where I am adding a loop to overlay videos and adding a concatenate filter you can learn from here how to add reset filters. I am working on FFmpeg-python there is much flexibility in adding custom commands. Hope this helps you or anyone else struggling to effectively utilize this lib. My_vid_stream = ffmpeg.output(my_vid_stream,output_file)
# now generate the output node and write it to an output file.
My_vid_stream = ffmpeg.filter(my_vid_stream, "crop", h="iw*9/16") # finally apply the crop filter to it's upstream node and assign the output stream back to the same variable. # next to the upstream node create a new filter which does the boxblur operation per your specs. # first filter you wanted to apply is 'scale' filter. # ffmpeg.filter() takes the upstream node followed by the name of the filter, followed by the configuration of the filter assign the video stream to a new variable, we will be creating filters to only video stream, as indicated by in ffmpeg command line. This stream base_object has two properties, audio and video. # The input() returns a stream object has what is called 'base_object' which represents the outgoing edge of an upstream node and can be used to create more downstream nodes. My_vid_stream = ffmpeg.input(input_file, "lavfi") So you'd represent this in ffmpeg-python terms as # create a stream object, Note that any supplied kwargs are passed to ffmpeg verbatim reading it tells me that you want to scale the video and then apply the boxblur filter followed by crop.
This function returns the stream downstream to the filter node you just created.įor example: In the example ffmpeg command line from the question. This is followed by all the filter conditions. Tip2: In general, ffmpeg.filter() takes the filter name as first param. Understanding the ffmpeg command line syntax. Tip1: A pre-requisite for using the library to 'encode any filter' is but here's an approach that worked for me.
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