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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
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Sur d’autres sites (11209)
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aacdec : remove a duplicated line
12 mai 2015, par Andreas Cadhalpun -
FFMpeg Command work in command line, but not in python script
20 février 2015, par FooldjOkay, kind of a weird problem. But I’m not sure whether it’s python, ffmpeg, or some stupid thing I’m doing wrong.
I’m trying to take a video, and take 1 frame a second, and output that frame to an image. Right now, if i use the command line with ffmpeg :
ffmpeg -i test.avi -r 1 -f image2 image-%3d.jpeg -pix_fmt rgb24 -vcodec rawrvideoIt outputs about 10 images, the images look fine, awesome. Now I have this code (right now some code from some github, as I wanted stuff that i was relatively sure would work, and mine is allll convoluted)
import subprocess as sp
import numpy as np
import re
import cv2
import time
FFMPEG_BIN = r'ffmpeg.exe'
INPUT_VID = 'test.avi'
def getInfo():
command = [FFMPEG_BIN,'-i', INPUT_VID, '-']
pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.PIPE)
pipe.stdout.readline()
pipe.terminate()
infos = pipe.stderr.read()
infos_list = infos.split('\r\n')
res = re.search(' \d+x\d+ ',infos)
res = [int(x) for x in res.group(0).split('x')]
return res
res = getInfo()
command = [ FFMPEG_BIN,
'-i', INPUT_VID,
'-f', 'image2pipe',
'-pix_fmt', 'rgb24',
'-vcodec', 'rawvideo', '-']
pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)
n = 0
im2 = []
try:
mog = cv2.BackgroundSubtractorMOG2(120,2,True)
while True:
raw_image = pipe.stdout.read(res[0]*res[1]*3)
# transform the byte read into a numpy array
image = np.fromstring(raw_image, dtype='uint8')
image = image.reshape((res[1],res[0],3))
rgbImg = image.copy()
fname = ('_tmp%03d.png'%time.time())
cv2.imwrite(fname, rgbImg)
# throw away the data in the pipe's buffer.
#pipe.stdout.flush()
n += 1
print n
except:
print 'done',n
pipe.kill()
cv2.destroyAllWindows()When I run this, I get 10 images, but they all have a Blue Tint ! I cannot for the life of me figure out why. I’ve done tons of searches, I’ve tried quite a few different codecs (usually just messes things up worse). The media info for the video file is here :
General
Complete name : test.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 85.0 KiB
Duration : 133ms
Overall bit rate : 5 235 Kbps
Video
ID : 0
Format : JPEG
Codec ID : MJPG
Duration : 133ms
Bit rate : 1 240 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate : 30.000 fps
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 8 bits
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.135
Stream size : 20.1 KiB (24%)Any suggestions ? It seems like it should be an RGB mixup...just not sure where at...
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FFMpeg Command work in command line, but not in python script. (Semi Solved)
20 février 2015, par FooldjOkay, kind of a weird problem. But I’m not sure whether it’s python, ffmpeg, or some stupid thing I’m doing wrong.
I’m trying to take a video, and take 1 frame a second, and output that frame to an image. Right now, if i use the command line with ffmpeg :
ffmpeg -i test.avi -r 1 -f image2 image-%3d.jpeg -pix_fmt rgb24 -vcodec rawrvideoIt outputs about 10 images, the images look fine, awesome. Now I have this code (right now some code from some github, as I wanted stuff that i was relatively sure would work, and mine is allll convoluted)
import subprocess as sp
import numpy as np
import re
import cv2
import time
FFMPEG_BIN = r'ffmpeg.exe'
INPUT_VID = 'test.avi'
def getInfo():
command = [FFMPEG_BIN,'-i', INPUT_VID, '-']
pipe = sp.Popen(command, stdout=sp.PIPE, stderr=sp.PIPE)
pipe.stdout.readline()
pipe.terminate()
infos = pipe.stderr.read()
infos_list = infos.split('\r\n')
res = re.search(' \d+x\d+ ',infos)
res = [int(x) for x in res.group(0).split('x')]
return res
res = getInfo()
command = [ FFMPEG_BIN,
'-i', INPUT_VID,
'-f', 'image2pipe',
'-pix_fmt', 'rgb24',
'-vcodec', 'rawvideo', '-']
pipe = sp.Popen(command, stdout = sp.PIPE, bufsize=10**8)
n = 0
im2 = []
try:
mog = cv2.BackgroundSubtractorMOG2(120,2,True)
while True:
raw_image = pipe.stdout.read(res[0]*res[1]*3)
# transform the byte read into a numpy array
image = np.fromstring(raw_image, dtype='uint8')
image = image.reshape((res[1],res[0],3))
rgbImg = image.copy()
fname = ('_tmp%03d.png'%time.time())
cv2.imwrite(fname, rgbImg)
# throw away the data in the pipe's buffer.
#pipe.stdout.flush()
n += 1
print n
except:
print 'done',n
pipe.kill()
cv2.destroyAllWindows()When I run this, I get 10 images, but they all have a Blue Tint ! I cannot for the life of me figure out why. I’ve done tons of searches, I’ve tried quite a few different codecs (usually just messes things up worse). The media info for the video file is here :
General
Complete name : test.avi
Format : AVI
Format/Info : Audio Video Interleave
File size : 85.0 KiB
Duration : 133ms
Overall bit rate : 5 235 Kbps
Video
ID : 0
Format : JPEG
Codec ID : MJPG
Duration : 133ms
Bit rate : 1 240 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate : 30.000 fps
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 8 bits
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.135
Stream size : 20.1 KiB (24%)Any suggestions ? It seems like it should be an RGB mixup...just not sure where at...
EDIT : So I fixed the problem by switching the blue and red channels with this code :
bChannel = rgbImg[ :, :,0]
rChannel = rgbImg[ :, :,2]
gChannel = rgbImg[ :, :,1]rgbArray = np.zeros((res[1],res[0],3), 'uint8')
rgbArray[...,0] = rChannel
rgbArray[...,1] = gChannel
rgbArray[...,2] = bChannelSo I guess this is now a question of, why is python mixing up these channels ? Is it a problem with python, or ffmpeg, the codec ?
Thanks !
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