Convert a sequence of ppm images to avi video
Solution 1
Not sure what bash script will do the task but this Python script works like a charm:
import cv2
import glob
img1 = cv2.imread('bat/FalseColor/CS585Bats-FalseColor_frame000000750.ppm')
height, width, layers = img1.shape
video = cv2.VideoWriter('video.avi', -1, 1, (width, height))
filenames = glob.glob('bat/FalseColor/*.ppm')
for filename in filenames:
img = cv2.imread(filename)
video.write(img)
cv2.destroyAllWindows()
video.release()
Solution 2
You have several options available with the image file demuxer.
Using the sequence pattern
ffmpeg -framerate 25 -i "CS585Bats-FalseColor_frame%09d.ppm" output
You can change the start number with the -start_number
input option.
Using the glob pattern
ffmpeg -pattern_type glob -framerate 25 -i "CS585Bats-FalseColor_frame*.ppm" output
If these are the only PPM files in the directory your glob pattern can be simpler:
ffmpeg -pattern_type glob -framerate 25 -i "*.ppm" output
Related videos on Youtube
Mona Jalal
contact me at [email protected] I am a 5th-year computer science Ph.D. Candidate at Boston University advised by Professor Vijaya Kolachalama in computer vision as the area of study. Currently, I am working on my proposal exam and thesis on the use of efficient computer vision and deep learning for cancer detection in H&E stained digital pathology images.
Updated on September 18, 2022Comments
-
Mona Jalal over 1 year
I want to convert a sequence of ppm images to avi video (or another possible video format accepted by OpenCV).
First I converted the ppm images with no drop in quality to jpg:
for f in *ppm ; do convert -quality 100 $f `basename $f ppm`jpg; done
Then I used the following command to convert to avi:
ffmpeg -i CS585Bats-FalseColor_frame*.jpg -vcodec mpeg4 test.avi
But I got the following error:
FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers built on Aug 2 2016 19:05:32 with clang 7.3.0 (clang-703.0.31) configuration: --enable-libmp3lame --enable-libfaac --enable-gpl --enable-nonfree --enable-shared --disable-mmx --arch=x86_64 --cpu=core2 libavutil 50.36. 0 / 50.36. 0 libavcore 0.16. 1 / 0.16. 1 libavcodec 52.108. 0 / 52.108. 0 libavformat 52.93. 0 / 52.93. 0 libavdevice 52. 2. 3 / 52. 2. 3 libavfilter 1.74. 0 / 1.74. 0 libswscale 0.12. 0 / 0.12. 0 Input #0, image2, from 'CS585Bats-FalseColor_frame000000750.jpg': Duration: 00:00:00.04, start: 0.000000, bitrate: N/A Stream #0.0: Video: mjpeg, yuvj444p, 1024x1024 [PAR 1:1 DAR 1:1], 25 tbr, 25 tbn, 25 tbc ffmpeg(11831,0x7fffa5dc6340) malloc: *** error for object 0x100000001: pointer being realloc'd was not allocated *** set a breakpoint in malloc_error_break to debug Abort trap: 6
Then I thought to use this other method but still get error:
$ convert -delay 6 -quality 100 CS585Bats-FalseColor_frame000000*ppm movie.mpg convert: delegate failed `'ffmpeg' -nostdin -v -1 -i '%M%%d.jpg' '%u.%m' 2> '%u'' @ error/delegate.c/InvokeDelegate/1919.
ppm file names look like below:
$ ls *ppm | head -5 CS585Bats-FalseColor_frame000000750.ppm CS585Bats-FalseColor_frame000000751.ppm CS585Bats-FalseColor_frame000000752.ppm CS585Bats-FalseColor_frame000000753.ppm CS585Bats-FalseColor_frame000000754.ppm
-
llogan over 6 yearsYour
ffmpeg
is absolutely ancient. Get a new version and prevent a headache.
-