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• how to create video stream from images collection and data

  9 juillet 2016, par Yanshof

  I want to continue my last question about video

  I want to create video stream from 400 images.
  But on this time i want to add some string ( data ) to the video stream.

  I mean that i want to add to each frame some data.
  I know that video can hold a data that can belong to any frame that appear.

  How to do it ?
  I looking at aforgenet and i found there only how to create the video stream from images.

  I did not found any how to add data ( string ) about any frame.

• How can I decode a packet data to image ? [duplicate]

  20 décembre 2020, par codcod55

  I am getting data which in .h264 format. The data which coming from camera is something like this :

  


  b'\x00\x00\x00\x01A\xf9\xc2 ;\xd7\x10\x0fQ\xbf\xa4+\x024\xd0\xf3_'\xceT\xe3\x1c4\xf7\xa2*\xc0`/J ;\xa5\xe8i\x99\xb1\x85\xf2\xe65\xf4\xeb\xcfD\x9e\x0b\xf2\xe5*\xcf2U\xabe\xf1\x0fJp\ ........ (It is longer)

  


  I want to decode this data format with ffmpeg or opencv functions. How can I save this data as a jpeg image.

  


  Here a piece of code :

  


   packet_data = b''
    while True:
        try:
            res_string, ip = self.socket_video.recvfrom(2048)
            packet_data += res_string
            print(packet_data)
            print(len(res_string))
            # end of frame
            if len(res_string) != 1460:
                for frame in self._h264_decode(packet_data):
                    self.frame = frame
                packet_data = ""

        except socket.error as exc:
            print ("Caught exception socket.error : %s" % exc)

def _h264_decode(self, packet_data):
    """
    decode raw h264 format data from Tello

    :param packet_data: raw h264 data array

    :return: a list of decoded frame
    """
    res_frame_list = []
    frames = ffmpeg.input(packet_data)
    for framedata in frames:
        (frame, w, h, ls) = framedata
        if frame is not None:
            # print 'frame size %i bytes, w %i, h %i, linesize %i' % (len(frame), w, h, ls)

            frame = np.fromstring(frame, dtype=np.ubyte, count=len(frame), sep='')
            frame = (frame.reshape((h, ls / 3, 3)))
            frame = frame[:, :w, :]
            res_frame_list.append(frame)

    return res_frame_list


  


  EDIT : My code working with python2 but I want to work with python3. h264 library doesn't support python3. Actually, I am trying to decode this data format without h264 library. I tried to use base64 format but I couldn't do it. As a result, I am looking for a method to convert this data to image without h264 library in python3.

  


• ffmpeg set data stream codec tag when copying

  19 mars 2021, par user972014

  I use ffmpeg to copy a data stream from one file to the other using -c copy

  


  The problem is that it causes the output file to have no codec tag string. How can I set it ?

  


  The name of the original stream was :

  


  Stream #0:3(eng): Data: none (gpmd / 0x646D7067), 96 kb/s (default)
    Metadata:
      creation_time   : 2020-09-08 16:35:49
      handler_name    : GoPro MET


  


  While for the output file I get it is :

  


  Stream #0:2[0x102]: Data: bin_data ([6][0][0][0] / 0x0006)


  


  I'm using a commandline similar to that :

  


  ffmpeg -i video.mp4 -map 0:3 -c copy -metadata:s:d codec_tag=xxxx -vcodec libx264 converted4.ts


  


  I also tried handler=... handler_name=...