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• Converting RTP data to RTSP

  20 janvier 2015, par Anandhu

  I am having a live stream of ts data. I streamed this with an rtp header and received it in an android device using vlc. Now i would like to stream the same stream using rtsp protocol. How can I do this. Is there some method for using this rtp data for streaming rtsp ?

• How to use pyav or opencv to decode a live stream of raw H.264 data ?

  6 mai 2024, par Dery

  The data was received by socket ,with no more shell , they are pure I P B frames begin with NAL Header(something like 00 00 00 01). I am now using pyav to decode the frames ,but i can only decode the data after the second pps info(in key frame) was received(so the chunk of data I send to my decode thread can begin with pps and sps ), otherwise the decode() or demux() will return error "non-existing PPS 0 referenced decode_slice_header error" .

  


  I want to feed data to a sustaining decoder which can remember the previous P frame , so after feeding one B frame, the decoder return a decoded video frame. Or someform of IO that can be opened as container and keep writing data into it by another thread.

  


  Here is my key code :

  


  #read thread... read until get a key frame, then make a new io.BytesIO() to store the new data.
rawFrames = io.BytesIO()
while flag_get_keyFrame:()
    ....
    content= socket.recv(2048)
    rawFrames.write(content)
    ....

#decode thread... decode content between two key frames
....
rawFrames.seek(0)
container = av.open(rawFrames)
for packet in container.demux():
    for frame in packet.decode():
        self.frames.append(frame)
....


  


  My code will play the video but with a 3 4 seconds delay. So I am not putting all of it here, because I know it's not actually working for what I want to achieve.
I want to play the video after receiving the first key frame and decode the following frames right after receiving them . Pyav opencv ffmpeg or something else ,how can I achieve my goal ?

  


• why ffmpeg starts many processes

  29 octobre 2020, par james

  I have a doubt about the functioning of the ffmpeg program, I noticed that after starting the program on a 4gb memory raspberry pi4 many processes are started, is it normal or is there something wrong with my program ? I remember that on an amazon ec2 instance by controlling with htop only one process was created

  


  Code I used

  


  from subprocess import Popen

ffmpeg_process = Popen(["ffmpeg", "-hide_banner", "-loglevel", "panic", "-y", "-i", "./video/video1.mp4",
                        "-vcodec", "h264", "-acodec", "mp3", "./video/video2.mp4"],
                        start_new_session=True)

ffmpeg_process.wait()