一、环境安装
当前环境在上一篇文章的基础上进行配置。
ROS系列（一）：【环境配置】rosbag 包安装_安装rosbag-CSDN博客
继续安装
sudo apt install ffmpegpython 包如下
pip install sensor_msgs --extra-index-url https://rospypi.github.io/simple/pip install geometry_msgs --extra-index-url https://rospypi.github.io/simple/pip install opencv-python安装好环境后：
使用如下脚本：
#!/usr/bin/env python3
"""
rosbag2video.py
rosbag to video file conversion tool
by Abel Gabor 2019
baquatelle@gmail.com
requirements:
sudo apt install python3-roslib python3-sensor-msgs python3-opencv ffmpeg
based on the tool by Maximilian Laiacker 2016
post@mlaiacker.de"""
import roslib
#roslib.load_manifest('rosbag')
import rospy
import rosbag
import sys, getopt
import os
from sensor_msgs.msg import CompressedImage
from sensor_msgs.msg import Image
import cv2
import numpy as np
import shlex, subprocess
MJPEG_VIDEO = 1
RAWIMAGE_VIDEO = 2
VIDEO_CONVERTER_TO_USE = "ffmpeg" # or you may want to use "avconv"
def print_help():
print('rosbag2video.py [--fps 25] [--rate 1] [-o outputfile] [-v] [-s] [-t topic] bagfile1 [bagfile2] ...')
print()
print('Converts image sequence(s) in ros bag file(s) to video file(s) with fixed frame rate using',VIDEO_CONVERTER_TO_USE)
print(VIDEO_CONVERTER_TO_USE,'needs to be installed!')
print()
print('--fps Sets FPS value that is passed to',VIDEO_CONVERTER_TO_USE)
print(' Default is 25.')
print('-h Displays this help.')
print('--ofile (-o) sets output file name.')
print(' If no output file name (-o) is given the filename \'<prefix><topic>.mp4\' is used and default output codec is h264.')
print(' Multiple image topics are supported only when -o option is _not_ used.')
print(' ',VIDEO_CONVERTER_TO_USE,' will guess the format according to given extension.')
print(' Compressed and raw image messages are supported with mono8 and bgr8/rgb8/bggr8/rggb8 formats.')
print('--rate (-r) You may slow down or speed up the video.')
print(' Default is 1.0, that keeps the original speed.')
print('-s Shows each and every image extracted from the rosbag file (cv_bride is needed).')
print('--topic (-t) Only the images from topic "topic" are used for the video output.')
print('-v Verbose messages are displayed.')
print('--prefix (-p) set a output file name prefix othervise \'bagfile1\' is used (if -o is not set).')
print('--start Optional start time in seconds.')
print('--end Optional end time in seconds.')
class RosVideoWriter():
def __init__(self, fps=25.0, rate=1.0, topic="", output_filename ="", display= False, verbose = False, start = rospy.Time(0), end = rospy.Time(sys.maxsize)):
self.opt_topic = topic
self.opt_out_file = output_filename
self.opt_verbose = verbose
self.opt_display_images = display
self.opt_start = start
self.opt_end = end
self.rate = rate
self.fps = fps
self.opt_prefix= None
self.t_first={}
self.t_file={}
self.t_video={}
self.p_avconv = {}
def parseArgs(self, args):
opts, opt_files = getopt.getopt(args,"hsvr:o:t:p:",["fps=","rate=","ofile=","topic=","start=","end=","prefix="])
for opt, arg in opts:
if opt == '-h':
print_help()
sys.exit(0)
elif opt == '-s':
self.opt_display_images = True
elif opt == '-v':
self.opt_verbose = True
elif opt in ("--fps"):
self.fps = float(arg)
elif opt in ("-r", "--rate"):
self.rate = float(arg)
elif opt in ("-o", "--ofile"):
self.opt_out_file = arg
elif opt in ("-t", "--topic"):
self.opt_topic = arg
elif opt in ("-p", "--prefix"):
self.opt_prefix = arg
elif opt in ("--start"):
self.opt_start = rospy.Time(int(arg))
if(self.opt_verbose):
print("starting at",self.opt_start.to_sec())
elif opt in ("--end"):
self.opt_end = rospy.Time(int(arg))
if(self.opt_verbose):
print("ending at",self.opt_end.to_sec())
else:
print("opz:", opt,'arg:', arg)
if (self.fps<=0):
print("invalid fps", self.fps)
self.fps = 1
if (self.rate<=0):
print("invalid rate", self.rate)
self.rate = 1
if(self.opt_verbose):
print("using ",self.fps," FPS")
return opt_files
# filter messages using type or only the opic we whant from the 'topic' argument
def filter_image_msgs(self, topic, datatype, md5sum, msg_def, header):
if(datatype=="sensor_msgs/CompressedImage"):
if (self.opt_topic != "" and self.opt_topic == topic) or self.opt_topic == "":
print("############# COMPRESSED IMAGE ######################")
print(topic,' with datatype:', str(datatype))
print()
return True;
if(datatype=="theora_image_transport/Packet"):
if (self.opt_topic != "" and self.opt_topic == topic) or self.opt_topic == "":
print(topic,' with datatype:', str(datatype))
print('!!! theora is not supported, sorry !!!')
return False;
if(datatype=="sensor_msgs/Image"):
if (self.opt_topic != "" and self.opt_topic == topic) or self.opt_topic == "":
print("############# UNCOMPRESSED IMAGE ######################")
print(topic,' with datatype:', str(datatype))
print()
return True;
return False;
def write_output_video(self, msg, topic, t, video_fmt, pix_fmt = ""):
# no data in this topic
if len(msg.data) == 0 :
return
# initiate data for this topic
if not topic in self.t_first :
self.t_first[topic] = t # timestamp of first image for this topic
self.t_video[topic] = 0
self.t_file[topic] = 0
# if multiple streams of images will start at different times the resulting video files will not be in sync
# current offset time we are in the bag file
self.t_file[topic] = (t-self.t_first[topic]).to_sec()
# fill video file up with images until we reache the current offset from the beginning of the bag file
while self.t_video[topic] < self.t_file[topic]/self.rate :
if not topic in self.p_avconv:
# we have to start a new process for this topic
if self.opt_verbose :
print("Initializing pipe for topic", topic, "at time", t.to_sec())
if self.opt_out_file=="":
out_file = self.opt_prefix + str(topic).replace("/", "_")+".mp4"
else:
out_file = self.opt_out_file
if self.opt_verbose :
print("Using output file ", out_file, " for topic ", topic, ".")
if video_fmt == MJPEG_VIDEO :
cmd = [VIDEO_CONVERTER_TO_USE, '-v', '1', '-stats', '-r',str(self.fps),'-c','mjpeg','-f','mjpeg','-i','-','-an',out_file]
self.p_avconv[topic] = subprocess.Popen(cmd, stdin=subprocess.PIPE)
if self.opt_verbose :
print("Using command line:")
print(cmd)
elif video_fmt == RAWIMAGE_VIDEO :
size = str(msg.width)+"x"+str(msg.height)
cmd = [VIDEO_CONVERTER_TO_USE, '-v', '1', '-stats','-r',str(self.fps),'-f','rawvideo','-s',size,'-pix_fmt', pix_fmt,'-i','-','-an',out_file]
self.p_avconv[topic] = subprocess.Popen(cmd, stdin=subprocess.PIPE)
if self.opt_verbose :
print("Using command line:")
print(cmd)
else :
print("Script error, unknown value for argument video_fmt in function write_output_video.")
exit(1)
# send data to ffmpeg process pipe
self.p_avconv[topic].stdin.write(msg.data)
# next frame time
self.t_video[topic] += 1.0/self.fps
def addBag(self, filename):
if self.opt_display_images:
from cv_bridge import CvBridge, CvBridgeError
bridge = CvBridge()
cv_image = []
if self.opt_verbose :
print("Bagfile: {}".format(filename))
if not self.opt_prefix:
# create the output in the same folder and name as the bag file minu '.bag'
self.opt_prefix = bagfile[:-4]
#Go through the bag file
bag = rosbag.Bag(filename)
if self.opt_verbose :
print("Bag opened.")
# loop over all topics
for topic, msg, t in bag.read_messages(connection_filter=self.filter_image_msgs, start_time=self.opt_start, end_time=self.opt_end):
try:
if msg.format.find("jpeg")!=-1 :
if msg.format.find("8")!=-1 and (msg.format.find("rgb")!=-1 or msg.format.find("bgr")!=-1 or msg.format.find("bgra")!=-1 ):
if self.opt_display_images:
np_arr = np.fromstring(msg.data, np.uint8)
cv_image = cv2.imdecode(np_arr, cv2.CV_LOAD_IMAGE_COLOR)
self.write_output_video( msg, topic, t, MJPEG_VIDEO )
elif msg.format.find("mono8")!=-1 :
if self.opt_display_images:
np_arr = np.fromstring(msg.data, np.uint8)
cv_image = cv2.imdecode(np_arr, cv2.CV_LOAD_IMAGE_COLOR)
self.write_output_video( msg, topic, t, MJPEG_VIDEO )
elif msg.format.find("16UC1")!=-1 :
if self.opt_display_images:
np_arr = np.fromstring(msg.data, np.uint16)
cv_image = cv2.imdecode(np_arr, cv2.CV_LOAD_IMAGE_COLOR)
self.write_output_video( msg, topic, t, MJPEG_VIDEO )
else:
print('unsupported jpeg format:', msg.format, '.', topic)
# has no attribute 'format'
except AttributeError:
try:
pix_fmt=None
if msg.encoding.find("mono8")!=-1 or msg.encoding.find("8UC1")!=-1:
pix_fmt = "gray"
if self.opt_display_images:
cv_image = bridge.imgmsg_to_cv2(msg, "bgr8")
elif msg.encoding.find("bgra")!=-1 :
pix_fmt = "bgra"
if self.opt_display_images:
cv_image = bridge.imgmsg_to_cv2(msg, "bgr8")
elif msg.encoding.find("bgr8")!=-1 :
pix_fmt = "bgr24"
if self.opt_display_images:
cv_image = bridge.imgmsg_to_cv2(msg, "bgr8")
elif msg.encoding.find("bggr8")!=-1 :
pix_fmt = "bayer_bggr8"
if self.opt_display_images:
cv_image = bridge.imgmsg_to_cv2(msg, "bayer_bggr8")
elif msg.encoding.find("rggb8")!=-1 :
pix_fmt = "bayer_rggb8"
if self.opt_display_images:
cv_image = bridge.imgmsg_to_cv2(msg, "bayer_rggb8")
elif msg.encoding.find("rgb8")!=-1 :
pix_fmt = "rgb24"
if self.opt_display_images:
cv_image = bridge.imgmsg_to_cv2(msg, "bgr8")
elif msg.encoding.find("16UC1")!=-1 :
pix_fmt = "gray16le"
else:
print('unsupported encoding:', msg.encoding, topic)
#exit(1)
if pix_fmt:
self.write_output_video( msg, topic, t, RAWIMAGE_VIDEO, pix_fmt )
except AttributeError:
# maybe theora packet
# theora not supported
if self.opt_verbose :
print("Could not handle this format. Maybe thoera packet? theora is not supported.")
pass
if self.opt_display_images:
cv2.imshow(topic, cv_image)
key=cv2.waitKey(1)
if key==1048603:
exit(1)
if self.p_avconv == {}:
print("No image topics found in bag:", filename)
bag.close()
if __name__ == '__main__':
#print()
#print('rosbag2video, by Maximilian Laiacker 2020 and Abel Gabor 2019')
#print()
if len(sys.argv) < 2:
print('Please specify ros bag file(s)!')
print_help()
sys.exit(1)
else :
videowriter = RosVideoWriter()
try:
opt_files = videowriter.parseArgs(sys.argv[1:])
except getopt.GetoptError:
print_help()
sys.exit(2)
# loop over all files
for files in range(0,len(opt_files)):
#First arg is the bag to look at
bagfile = opt_files[files]
videowriter.addBag(bagfile)
print("finished")
使用方法介绍：
python rosbag2video.py XXX.bag
参数说明：
[–fps] ：设置传递给ffmpeg的帧率，默认为25；
[-h]：显示帮助；
[–ofile]：设置输出文件名；
[–rate]：放慢或加快视频。默认值是1.0，保持原来的速度；
[-s]：显示从rosbag文件提取的每个图像；
[–topic]：仅来自“topic”的图像用于视频输出；
[-v]：显示详细消息；
[–prefix]：设置输出文件名前缀，否则使用“ bagfile1”（如果未设置-o）；
[–start]：可选的开始时间（以秒为单位）；
[–end]：可选结束时间，单位为秒；
执行结果：
![[C++]:1.初识C++和C语言缺陷补充。](https://img-blog.csdnimg.cn/edad72d230224dca87297d99fd3d71c0.png)
