Image and video processing recipes

I often need to perform some operations on videos or image sequences. Usually I use linux and ffmpeg, and sometimes I struggle to remember all the commands. Here is a collection of recipes that I usually use with a bit of explanations. Video conversions Cut a range of frames Cut a range of frames (100, 130) from a video and save it to mp4 with a good quality using x264 codec:...

March 27, 2020 · SergeM

convert video to jpeg with good quality

convert video to jpeg with good quality: 1 avconv -i input_video.mp4 -qmax 1 -qmin 1 images_%05d.jpg crop video: 1 avconv -i input.avi -vf crop=<width>:<height>:<x>:<y> output_%05d.png create gif using http://gifmaker.me/

December 14, 2015 · SergeM

ffmpeg(avconv) jpeg quality

conversion with good jpeg quality: 1 avconv -i ./input.avi -q:v 1 output_frame_%05d.jpg

September 6, 2015 · SergeM

Convert all *.avi files in current directory to png sequences

Using python and ffmpeg: 1 2 3 4 5 6 7 8 9 10 11 12 13 #!/usr/bin/python import glob import os t=glob.glob("*.avi" ) # search all AVI files for v in t: vv = os.path.splitext(v)[0]; os.makedirs( vv ) # make a directory for each input file pathDst = os.path.join( vv, "%05d.png" ) # deststination path os.system("ffmpeg -i {0} {1}".format( v, pathDst ) )

October 22, 2013 · SergeM

Trim frames from raw YUV video using FFMPEG

Trim 5 frames starting from 160-th frame and write to png sequence ffmpeg -pix_fmt yuv420p -s 1920x1088 -r 1 -i input_video.yuv -r 1 -ss 160 -frames 5 output_sequence_%d.png size of input video is 1920x1088, format YUV420 progressive. UPD: ffmpeg is renamed to avconv. Using it for trimming AVI video: avconv -ss 00:58:00 -t 00:59:30 -i ./video.avi frame_%05d.png UPD2: it seems ffmpeg is back.

July 2, 2013 · SergeM