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13 avril 2011MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
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13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
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Decoding the h.264 stream from a serial port
18 mars, par PeterI would like to know if there is a reliable way to decode an H.264 NAL stream coming through a serial port using software.


So far, I have managed to decode a single frame using a python script. In this script, I first write the incoming data to a file, and when the end-of-frame marker 00_00_00_01 appears, I display the frame using ffplay.


import serial
import subprocess
import os
import time

ser = serial.Serial('COM3', 115200, timeout=1)
output_file = "output.264"

# Variable to store the ffplay process
ffplay_process = None

# Open the file for writing in binary mode
with open(output_file, "wb") as file:

 print("Writing bytes to output.264. Waiting for the end-of-frame marker 0x00000001.")

 buffer = bytearray()
 marker = b'\x00\x00\x00\x01'

 try:
 while True:
 if ser.in_waiting: # If there is data in the buffer
 data = ser.read(ser.in_waiting) # Read all available bytes
 buffer.extend(data)

 # Check if the end-of-frame marker is in the buffer
 while marker in buffer:
 index = buffer.index(marker) + len(marker) # Position after the marker
 frame = buffer[:index] # Extract the frame
 buffer = buffer[index:] # Keep the remaining data

 print(f"Frame recorded: {len(frame)} bytes")
 file.write(frame) # Write the frame to the file
 file.flush() # Force writing to disk

 # Close the ffplay window if it is already open
 if ffplay_process and ffplay_process.poll() is None:
 ffplay_process.terminate()
 ffplay_process.wait() # Wait for the process to terminate

 # Play the recorded frame, reopening the window
 ffplay_process = subprocess.Popen(["ffplay", "-f", "h264", "-i", output_file])

 except KeyboardInterrupt:
 print("\nRecording stopped.")
 finally:
 # Close the serial port and the ffplay process
 ser.close()



However, each time a new end-of-frame marker is detected, the ffplay window closes and reopens to show the next frame. It will flicker when transferring the video. Is there a way to display the frames in the same window for seamless playback when streaming video ?


Or is there a better approach or software that is more suited for this task ? I do not know where to start, so I will be glad for any hints.