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• Python-FFMPEG Corruption Problems

  11 juillet 2023, par Gabriel Ruben Guzman

  I'm repurposing some python code to generate gifs/mp4s showcasing nba player movements dot form. (With the 'frames' used in the gifs being generated by matplotlib).

  


  The repo comes with two different functions for generating the gifs, watch_play and animate_play. Both of which use python command line functionalities to run ffmpeg and generate the mp4s.
I've been able to use the watch_play succesfully, bot every time I try using animate_play, which according to the documention is meant to be significantly faster than watch play, I run into the error showcased here.(I printed the cmd string being passed into the pipe, in the hopes it would make debugging easier)

  


  I've tried generating gifs/mp4s of various size and added a decent bit of code to lessen the volume of data being processed. (I'm essentially repurposing the code just to generate clips, so I've been able to remove a lot of the pbp/tracking data logs to speed up the run time) But no matter what I've done, gotten some variation of the screenshotted error.

  


  pipe: : corrupt input packet in stream 0&#xA;[rawvideo @ 0x55ccc0e2bb80] Invalid buffer size, packet size 691200 < expected frame_size 921600&#xA;Error while decoding stream #0:0 : Invalid argument

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  The code for animate_play

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  def animate_play(self, game_time=None, length=None, highlight_player=None,
                 commentary=True, show_spacing=None):
    """
    Method for animating plays in game.
    Outputs video file of play in {cwd}/temp.
    Individual frames are streamed directly to ffmpeg without writing them
    to the disk, which is a great speed improvement over watch_play

    Args:
        game_time (int): time in game to start video
            (seconds into the game).
            Currently game_time can also be an tuple of length two
            with (starting_frame, ending_frame)if you want to
            watch a play using frames instead of game time.
        length (int): length of play to watch (seconds)
        highlight_player (str): If not None, video will highlight
            the circle of the inputed player for easy tracking.
        commentary (bool): Whether to include play-by-play commentary in
            the animation
        show_spacing (str) in ['home', 'away']: show convex hull
            spacing of home or away team.
            If None, does not show spacing.

    Returns: an instance of self, and outputs video file of play
    """
    if type(game_time) == tuple:
        starting_frame = game_time[0]
        ending_frame = game_time[1]
    else:
        game_time= self.start +(self.quarter*720)
        end_time= self.end +(self.quarter*720)
        length = end_time-game_time
        # Get starting and ending frame from requested 
        # game_time and length
        print('hit')
        print(len(self.moments))
        print(game_time)
        print(end_time)
        print(length)
        print(game_time+length)
        
        print(self.moments.game_time.min())
        print(self.moments.game_time.max())

        sys.exit()
        starting_frame = self.moments[self.moments.game_time.round() ==
                                      game_time].index.values[0]
        ending_frame = self.moments[self.moments.game_time.round() ==
                                    game_time + length].index.values[0]

    # Make video of each frame
    filename = "./temp/{game_time}.mp4".format(game_time=game_time)
    if commentary:
        size = (960, 960)
    else:
        size = (480, 480)
    cmdstring = ('ffmpeg',
                 '-y', '-r', '20',  # fps
                 '-s', '%dx%d' % size,  # size of image string
                 '-pix_fmt', 'argb',  # Stream argb data from matplotlib
                 '-f', 'rawvideo','-i', '-',
                 '-vcodec', 'libx264', filename)
    #print(pipe)
    #print(cmdstring)
    
    

    # Stream plots to pipe
    pipe = Popen(cmdstring, stdin=PIPE)
    print(cmdstring)
    for frame in range(starting_frame, ending_frame):
        print(frame)
        self.plot_frame(frame, highlight_player=highlight_player,
                        commentary=commentary, show_spacing=show_spacing,
                        pipe=pipe)
    print(cmdstring)
    pipe.stdin.close()
    pipe.wait()
    return self


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  The code for watch play

  &#xA;

  def watch_play(self, game_time=None, length=None, highlight_player=None,
               commentary=True, show_spacing=None):

    """
    DEPRECIATED.  See animate_play() for similar (fastere) method

    Method for viewing plays in game.
    Outputs video file of play in {cwd}/temp

    Args:
        game_time (int): time in game to start video
            (seconds into the game).
            Currently game_time can also be an tuple of length
            two with (starting_frame, ending_frame) if you want
            to watch a play using frames instead of game time.
        length (int): length of play to watch (seconds)
        highlight_player (str): If not None, video will highlight
            the circle of the inputed player for easy tracking.
        commentary (bool): Whether to include play-by-play
            commentary underneath video
        show_spacing (str in ['home', 'away']): show convex hull
            of home or away team.
            if None, does not display any convex hull

    Returns: an instance of self, and outputs video file of play
    """
    print('hit this point ')
    warnings.warn(("watch_play is extremely slow. "
                   "Use animate_play for similar functionality, "
                   "but greater efficiency"))

    if type(game_time) == tuple:
        starting_frame = game_time[0]
        ending_frame = game_time[1]
    else:
        # Get starting and ending frame from requested game_time and length
        game_time= self.start +(self.quarter*720)
        end_time= self.end +(self.quarter*720)
        length = end_time-game_time


        starting_frame = self.moments[self.moments.game_time.round() ==
                                      game_time].index.values[0]
        ending_frame = self.moments[self.moments.game_time.round() ==
                                    game_time + length].index.values[0]
    #print(self.moments.head(2))
    #print(starting_frame)
    #print(ending_frame)
    print(len(self.moments))
    # Make video of each frame
    title = str(starting_frame)+'-'+str(ending_frame)
    for frame in range(starting_frame, ending_frame):
        print(frame)
        self.plot_frame(frame, highlight_player=highlight_player,
                        commentary=commentary, show_spacing=show_spacing)
    command = ('ffmpeg -framerate 20 -start_number {starting_frame} '
               '-i %d.png -c:v libx264 -r 30 -pix_fmt yuv420p -vf '
               '"scale=trunc(iw/2)*2:trunc(ih/2)*2" {title}'
               '.mp4').format(starting_frame=starting_frame,title=title)
    os.chdir('temp')
    os.system(command)
    os.chdir('..')

    # Delete images
    for file in os.listdir('./temp'):
        if os.path.splitext(file)[1] == '.png':
            os.remove('./temp/{file}'.format(file=file))

    return self'


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• For converting video to frames, should I do client or server side processing ?

  23 mars 2024, par Tomas Marson

  Here is the thing, I have a Nodejs API that serves one video at a time when client request it.

  &#xA;

  The client (made in react) receives the video, which has no more than 15 seconds, watch it and decide if he wants to approve or deny it.&#xA;If he approves the video, it must be displayed in a sort of frames carousel, with one frame per second, so there is no more than 15 images/frames.

  &#xA;

  So the question is, should I do the conversion video-to-frames on client once he approves the video or should I do it on server-side and then request each frame (or streaming all frames with one request if possible) ?

  &#xA;

  Now, I'm doing the conversion on server with ffmpeg, but it seems tricky to send all the frames when the client already have them inside the video.

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• How do I add a cool down to a command for a discord music bot [closed]

  22 mars 2021, par sherbit fish

  I'm making a music bot in discord and I need to add a cool down into this command so that people don't spam it and crash the bot. What should I do to fix this problem ?

  &#xA;

  const ytdl = require("ytdl-core");

client.on('message', async message => {
  if (message.member.voice.channel) {
    const connection = await message.member.voice.channel.join();
    console.log(`sound was just played`);
connection.play(ytdl('https://www.youtube.com/watch?v=jRxSRyrTANY',{ highWaterMark: 50 },{ quality: 'highestaudio' },{ type: 'opus' }));
setTimeout(() => {
  connection.disconnect();
}, 12000); 
  }
});


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