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• Not synchronized audio and video recorded with python

  9 décembre 2022, par LAC

  i bought an USB microphone and a Camera module for the raspberry pi4. I managed to record Audio and Video but when i merge them with ffmpeg the are not synchronized, i'm trying to solve this for 2 days now.

  


  Here my code, when the program starts it record video with the instruction "camera.start_recording("Video.h264")", this instruction return immediatly so when the program executes the instruction after camera.start_recording("Video.h264") the video is still recording.

  


  For recording Audio i use a while loop that stops when i press a button. When i press the button the video recording also stops.

  


  After everything is written i use ffmpeg to merge the video (After converting it to mp4) and the Audio.

  


  # coding=utf-8

from picamera import PiCamera

import pyaudio

import wave

import os

import time

import RPi.GPIO as GPIO

GPIO.setwarnings(False)

GPIO.setmode(GPIO.BOARD)

GPIO.setup(10, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

print("Ready")

go = True

camera = PiCamera()

camera.resolution = (1920, 1080)

audio = pyaudio.PyAudio()

stream = audio.open(format=pyaudio.paInt16, channels=1, rate=44100, input=True)

frames = []

camera.start_recording("Video.h264")

while go:

    print("Recording")

    if GPIO.input(10) == GPIO.HIGH:

        camera.stop_recording()

        go = False

        print("Recording has been stopped")


data = stream.read(1024, exception_on_overflow = False)
frames.append(data)

stream.stop_stream()

stream.close()

audio.terminate()

sound_file = wave.open("Audio.wav", "wb")

sound_file.setnchannels(1)

sound_file.setsampwidth(audio.get_sample_size(pyaudio.paInt16))

sound_file.setframerate(44100)

sound_file.writeframes(b''.join(frames))

sound_file.close()

print("Converting in mp4")

os.system("ffmpeg -i Video.h264 Video.mp4")

print("Merging audio and video")

os.system("ffmpeg -i Video.mp4 -i Audio.wav -c:v copy -c:a aac vea.mp4")


  


• WMA Lossless and ProRes Encoder

  4 mars 2012, par Multimedia Mike — General

  The projects (FFmpeg / Libav) just got a WMA lossless decoder. For those keeping score, this means that there are open source methods for decoding every single one of Microsoft’s proprietary audio codecs (Windows Media Audio, or WMA) : WMA v1, WMA v2, WMA9/Pro, WMA Voice, and now WMA lossless. Currently, it’s only advertised to decode 16-bit audio (no 24-bit). Also, when I first tried it a few days ago, it didn’t decode the very end of the single sample file I concocted many years ago (luckynight.wma). But that might be cleared up by now.

  Some other recent developments in the projects that I wanted to call out : An encoder for the Apple ProRes encoder from Kostya ; XWD (X window dump) image decoding and encoding from Paul B. Mahol ; a Sun rasterfile encoder from Aneesh Dogra.

  And then there’s the new playback system for CDXL files, also courtesy of Paul B. Mahol. I wasn’t familiar with this format until I wrote this post, which is surprising, given the format’s vintage. This was a CD-ROM FMV format favored for Amiga computers. Here it is in all its 160x120x10fps glory :

  
  
  

  That’s the amigaball.cdxl sample available in the repository. The sample is 3835910 bytes large and plays for about 24 seconds. This yields a data rate of about 159 kbytes/second. So, yeah, single-speed CD-ROM FMV.

• FFMPEG multi livestream - recorded stream send to different services like YT and Twitch at different time (on different button clicks )

  4 octobre 2022, par Ganesh

  Trying for the last 10 days and still no success, I am creating a python application that will accept the URL and visit that URL using chromium, capture that screen and send that real-time screen recording to different live stream acceptors as youtube live, twitch Twitter, Facebook live or some other sources and many of these could be multiple.

  


  There are two challenges (both challenges depend on a user action like different button clicks) -

  


  

  • The time of starting the Livestream we know only one Livestream acceptor and other acceptors could be sent via another API at any time or may not be sent on the whole live stream.

  


  • Any of the streams could be stopped at any moment including the first one which started the original live streaming service

  


  


  To Solve these challenges I am trying the following process (i took mp4 as a source for simplifying)

  


  

  • create a stream and store it into PIPE.stdout

  


  


  ffmpeg_Command_get_stream = 'ffmpeg -re -i test.mp4 -f flv pipe:1'
ffmpeg_Command_get_stream=ffmpeg_Command_get_stream.split()
pipe = sp.Popen(ffmpeg_Command_get_stream,
            stdout=sp.PIPE,
            stderr=sp.PIPE,
            bufsize=8000000,
            shell=True,
            universal_newlines=True
            )
out,err = pipe.communicate()


  


  


  • and send that stream with the help of FFMPEG to the Livestream acceptor with the click of the youtube Livestream button

    


    ffmpeg_Command_send_stream = ['ffmpeg','-i',pipe.stdout,'-f','flv',RTMPURL_YOUTUBE]

    


  


  


  Update Trying to Explain it a little more :

  


  step 1 - I need a real-time stream from the first command, so I used -re in FFMPEG

  


  step 2 - Use above stream as an input for other command and send that as an output as a Livestream to youtube (or twitch/Facebook), But the second step would happen only when the user click on the button "YT LiveStream", Here the tricky thing is there are multiple buttons (YT LiveStream, Twitch LiveStream, Facebook LiveStream) and user can click any time on any of button, also can click on all button one by one.

  


  

  


  sorry for bad explaination

  


  what I am doing wrong ? , Is this Possible ? or need to go with another process,

  


  any help would be greatly appreciated