Recherche avancée

Sur d’autres sites (6489)

• ffmpeg hls duation is wrong on m3u8

  26 juin 2018, par Haris

  I am using ffmpeg to store the video in hls format using below command

  ~/bin/ffmpeg -r 15 -i rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov -codec copy -hls_list_size 65535 -hls_time 2 -g 2 "./live.m3u8"

  where I am getting lists of ts file and live.m3u8 file. Note in above command the duration of hls file segment set 2 second.

  Here is the content of live.m3u8

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:2
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXTINF:2,
  
  live0.ts
  
  #EXTINF:2,
  
  live1.ts
  
  #EXTINF:2,
  
  live2.ts
  
  #EXTINF:2,
  
  live3.ts
  
  #EXTINF:1,
  
  live4.ts
  
  #EXTINF:2,
  
  live5.ts
  
  #EXT-X-ENDLIST

  Note in above file the duration is not always 2 second and it varies. And When I check the duration of actual ts file segment using ffprob I am getting float value,

  For example,

  ~/bin/ffprobe -i live3.ts -show_entries format=duration -v quiet -of csv="p=0"

  gives 2.261556

  And

  ~/bin/ffprobe -i live4.ts -show_entries format=duration -v quiet -of csv="p=0"

  gives the duration 1.298256

  It seems the ffmpeg file round the float value to int and write to live.m3u8 file. This cause some problem in seeking the video file(seek to incorrect timestamp) and also the total duration of video file is always displayed less than the actual duration. For example, if I record the video for 2 hour, and open the live.m3u8 using vlc player, I can see that the video duration is displayed 1:45 min and I am able to seek up to 2 hours.

  What could be the issue,

  ffmpeg version : ffmpeg version git-2014-06-24-b52637c

  Reference image

  

  Edit :

  I have updated the ffmpeg to newer version based on the instruction here https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu. But still some issue. Now the live.m3u8 files generates the timing information in float, but the value is not accurate.
  For example

  The m3u8 file generated is

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXTINF:3.200000,
  
  live0.ts
  
  #EXTINF:3.100000,
  
  live1.ts
  
  #EXTINF:3.100000,
  
  live2.ts
  
  #EXTINF:2.340000,
  
  live3.ts
  
  #EXT-X-ENDLIST

  and if I check the duration of live0.ts using the command ~/bin/ffprobe -i live0.ts -show_entries format=duration -v quiet -of csv="p=0" it print 2.3333 where as in the playlist file it’s 3.200000.

  What could be the issue ?.

• FFmpeg python doesn't merge

  24 avril 2021, par MaLoLHDX

  I was making this youtube downloader GUI with Python : it asks for the URL, gives you a list with the possible quality settings and downloads the selected video file and the best audio file with youtube-dl. However, when I tell ffmpeg to merge the two separate downloaded files, it doesn't do anything and it doesn't say anything in the console either. Is there anything I'm missing ?

  


  Here's the relevant part of the code (starts at line 153) :

  


              #Adding input arguments for ffmpeg
            ffmpeg_video = ffmpeg.input(self.video_title)
            ffmpeg_audio = ffmpeg.input(self.audio_title)
            output_ffmpeg_title = './videos/' + self.youtube_title
            #Merging with ffmpeg
            out = ffmpeg.output(ffmpeg_video, ffmpeg_audio, output_ffmpeg_title, vcodec='copy', acodec='aac')
            out.run


  


  Here's the full code :

  


  import youtube_dl
import tkinter as tk
import operator
import ffmpeg
class GUI:
    def __init__(self):
        #Creating initial window
        self.window = tk.Tk()
        self.window.title('YTDL')
        self.window.geometry('300x70')
        
        self.urlbox = tk.Entry(self.window)
        self.urlbox.pack(padx=5,pady=5)
        #Creating download button, which will open the format selection window
        downbutton = tk.Button(self.window, text="Download", command= self.check_url)
        downbutton.pack(padx=5, pady=5)
        #Creating a variable to keep track of the point in the GUI options selection
        self.format_select_process = False
        
        self.window.mainloop()
    def check_url(self):
        #Saving selected URL to variable
        self.selected_url = self.urlbox.get()
        self.urlbox.delete(0, 'end')
        #If something was written in the URL box, try to go the next step
        if len(self.selected_url) != 0:
            self.get_formats(self.selected_url)
        else:
            print('URL box is empty!')
    def get_formats(self, x):
        with youtube_dl.YoutubeDL() as ydl:
            meta = ydl.extract_info(x, download=False)
            #Save formats from 'meta' to 'self.formats'
            self.formats = meta.get('formats', [meta])
            self.youtube_title = meta.get('title', [meta])
            #Creating two dictionaries for the list of format sizes and extensions
            self.f_list_size_dict = {}
            self.f_list_ext_dict = {}
            #Creating audio format list
            self.audio_format_list = []
        #For every format in self.formats, add its format, extension, fps and filesize to self.f_list
        for f in self.formats:
            self.f_list = '-' + f['format']+ ' -' + f['ext'] + ' -' + str(f['fps']) + ' ' + str(f['filesize'])
            if 'audio only' in f['format']:
                #Add an element to each dictonary whose name is the format ID and whose value is its filesize/extension
                self.f_list_size_dict[f['format'].split(' -')[0]] = f['filesize']
                self.f_list_ext_dict[f['format'].split(' -')[0]] = f['ext']
                #Add to the audio format list the current audio format ID
                self.audio_format_list.append(f['format'].split(' -')[0])
        print('Audio format list:')
        print(self.audio_format_list)
        print('Size list dict:')
        print(self.f_list_size_dict)
        print('Ext list size dict:')
        print(self.f_list_ext_dict)
        """
        #Making a new list which only contains the audio format IDs
        self.audio_format_list = str(self.f_list_size_dict.keys()).split('([')[1]
        self.audio_format_list = self.audio_format_list.split('])')[0]
        self.audio_format_list = self.audio_format_list.replace("'", "")
        self.audio_format_list = self.audio_format_list.split(', ')
        print('Cleaned up audio format list:')
        print(self.audio_format_list)
        """
        #Here the program starts looking for the best audio format
        #In the try block, the program gets the best audio format's ID from the size dict and extension from the ext dict
        #In the except block, the program gets the ID from the audio format list and the extension from the ext dict
        try:
            self.highest_audio = max(self.f_list_size_dict.items(), key=operator.itemgetter(1))[0]
            self.highest_audio_ext = self.f_list_ext_dict.get(self.highest_audio)
            print('Best audio format ID: ' + self.highest_audio)
            print('Best audio format extension: ' + self.highest_audio_ext)
        except:
            self.highest_audio = max(self.audio_format_list)
            self.highest_audio_ext = self.f_list_ext_dict.get(self.highest_audio)
            print(self.highest_audio)
            print(self.highest_audio_ext)
        #Going to next sted of the code, which renders the format choice window
        self.format_select()
    def format_select(self):
        self.window.withdraw()
        format_select_window = tk.Toplevel()
        format_select_window.attributes('-topmost', True)
        format_select_window.geometry("300x350")
        format_select_window_label = tk.Label(format_select_window, text="Select the video format")
        format_select_window_label.pack(padx=5, pady=5)
        format_select_window.protocol('WM_DELETE_WINDOW', lambda: exit())

        self.format_listbox = tk.Listbox(format_select_window, height=15, width=40, yscrollcommand=1)
        self.format_listbox.pack(padx=10, pady=10)
        for index, item in enumerate(self.f_list):
            self.f_list_lenght = index
        download_button = tk.Button(format_select_window, text='Download', command=self.download)
        download_button.pack(padx=10, pady=10)
        #Adding options to the listbox
        for f in self.formats:
            #If it is adding an audio only format, it will add the ID, filesize (if possible with try block) and extension
            if 'audio only' in f['format'] + ' ' + str(f['fps']) + ' FPS ' + f['ext']:
                try:
                    mb_filesize = round(f['filesize'] / 1024 / 1024, 2)
                    self.format_listbox.insert(self.f_list_lenght, f['format'] + ' ' + str(mb_filesize) + ' MiB  ' + f['ext']) 
                except:
                    self.format_listbox.insert(self.f_list_lenght, f['format'] + '  ' + f['ext'])
            #If it is adding a video format, it will add the ID, FPS, filesize (if possible with the try block) and extension
            else:
                try:
                    mb_filesize = round(f['filesize'] / 1024 / 1024, 2)
                    self.format_listbox.insert(self.f_list_lenght, f['format'] + ' ' + str(f['fps']) + ' FPS' + ' ' + str(mb_filesize) + ' MiB  ' + f['ext'])
                except:
                    self.format_listbox.insert(self.f_list_lenght, f['format'] + ' ' + str(f['fps']) + ' FPS  ' + f['ext'])
    def download(self):
        #Getting the list position of the selected format
        selected_format_list_position = self.format_listbox.curselection()
        #Getting the text of the selected format list item
        selected_format = self.format_listbox.get(selected_format_list_position)
        print('Selected format: ' + selected_format)
        #Cutting from the selected format list item text everything past ' -' to only get the format's ID
        selected_format_id = selected_format.split(' -')[0]
        print('Selected format ID: ' + selected_format_id)
        #Converting the ID to string
        final_selected_format_id = str(selected_format_id)
        print('Final selected format: ' + final_selected_format_id)
        #Cutting from the selected format list item text everything before '  ' to only get the extension
        final_ext = selected_format.split('  ')[1]
        print('Final video extension: ' + final_ext)
        if 'audio only' in selected_format:
            #Creating the download options dictionary (not working):
            #Setting the download location to the videos folder,
            #preventing the program from downloading a whole playlist,
            #telling youtube-dl to extract audio ('x'),
            #giving youtube-dl the requested format (which is only audio).
            self.ydl_opts = {'outtmpl':'./videos/%(title)s.%(ext)s', 'noplaylist': True, 'x': True, 'format': final_selected_format_id}
            #Downloading
            with youtube_dl.YoutubeDL(self.ydl_opts) as ydl:
                ydl.download([self.selected_url])
        elif 'audio only' not in selected_format:
            #Adding '+bestaudio' to the selected format ID (which is only a video ID in this case)
            final_selected_format_id_video_audio = str(selected_format_id) + '+bestaudio'
            #Creating the download options dictionary:
            #Setting the download location to the videos folder,
            #preventing the program from downloading a whole playlist,
            #giving youtube-dl the requested format with audio.
            self.ydl_opts = {'outtmpl':'./videos/%(title)s.%(ext)s', 'noplaylist': True, 'format': final_selected_format_id_video_audio}
            #Predicting the video file title and location for future ffmpeg merge
            self.video_title = './videos/' + self.youtube_title + '.f' + str(selected_format_id) + '.' + final_ext
            print('Video file title: ' + self.video_title)
            #Predicting the audio file title and location for future ffmpeg merge
            self.audio_title = './videos/' + self.youtube_title + '.f' + str(self.highest_audio) + '.' + self.highest_audio_ext
            print('Audio file title: ' + self.audio_title)
            #Downloading with youtube-dl
            with youtube_dl.YoutubeDL(self.ydl_opts) as ydl:
                ydl.download([self.selected_url])
            #Adding input arguments for ffmpeg
            ffmpeg_video = ffmpeg.input(self.video_title)
            ffmpeg_audio = ffmpeg.input(self.audio_title)
            output_ffmpeg_title = './videos/' + self.youtube_title
            #Merging with ffmpeg
            ffmpeg.output(ffmpeg_video, ffmpeg_audio, output_ffmpeg_title, vcodec='copy', acodec='aac')
GUI()


  


  If there is a better way of integrating ffmpeg with youtube-dl in Python, please tell me.

  


• How to record depth stream from realsense L515

  22 avril 2022, par Bilal

  I have a depth camera (Intel Realsense L515) and I do like to record a video of the depth.

  


  I have seen this answer which is using FFMPEG, but I didn't know how to replicate it in my case !

  


  I'm using this code :

  


  import cv2
import numpy as np
import pyrealsense2 as rs
import time

pipeline = rs.pipeline()
config = rs.config()

"""
# Depth Mode
"""
# Resolution
res = [(1024, 768), (640, 480), (320, 240)]
resolution = res[0]
print("RealSense Resolution:{}\n".format(resolution))

# # initialize video writer
fourcc = cv2.VideoWriter_fourcc('F','F','V','1')
fps = 30
video_filename = 'output.avi'
out = cv2.VideoWriter(video_filename, fourcc, fps, resolution, False)


config.enable_stream(rs.stream.depth, resolution[0], resolution[1], rs.format.z16, 30)
profile = config.resolve(pipeline)
# Start streaming
pipeline.start(config)

# Declare sensor object and set options
depth_sensor = profile.get_device().first_depth_sensor()
depth_sensor.set_option(rs.option.visual_preset, 5) # 5 is short range, 3 is low ambient light
depth_sensor.set_option(rs.option.receiver_gain, 8)
depth_sensor.set_option(rs.option.pre_processing_sharpening, 0.0)
depth_sensor.set_option(rs.option.post_processing_sharpening, 3.0)
depth_sensor.set_option(rs.option.laser_power, 100)
depth_sensor.set_option(rs.option.confidence_threshold, 2)
# Get the sensor once at the beginning. (Sensor index: 1)

# # Filters
threshold_filter = rs.threshold_filter(min_dist=1.2, max_dist=1.4)
temporal_filter = rs.temporal_filter(smooth_alpha=0.1, smooth_delta = 9.0,persistence_control=7)

try:
    # # Filters
    threshold_filter = rs.threshold_filter(min_dist=1.2, max_dist=1.4)
    temporal_filter = rs.temporal_filter(smooth_alpha=0.1, smooth_delta = 75.0,persistence_control=0)

    tic = time.time()

    while True:
        # Wait for depth frames:
        frames = pipeline.wait_for_frames()
        depth_frame = frames.get_depth_frame()
        if not depth_frame:
            continue

        #------------
        # # FILTERS |
        #------------

        depth_frame = threshold_filter.process(depth_frame)
        depth_frame = temporal_filter.process(depth_frame)

        # Convert images to numpy arrays
        depth_array = np.asanyarray(depth_frame.get_data())
        # depth_array = np.asanyarray(colorizer.colorize(depth_frame).get_data())

        out.write(depth_array)
        toc = time.time()
        if(round(toc  - tic) > 30):
            break

finally:
    out.release()
    pipeline.stop()


  


  And getting this error :

  


  


  out.write(depth_array)
cv2.error : OpenCV(4.5.4) /tmp/pip-req-build-kneyjnox/opencv/modules/videoio/src/cap_ffmpeg.cpp:186 : error : (-215:Assertion failed) image.depth() == CV_8U in function 'write'

  


  


  Can you please tell me how can I record the depth from my camera ? thanks in advance.