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• YouTube live says not receiving data

  17 novembre 2018, par Steve Lobdell

  So, I’m using ffmpeg. I can stream videos to YouTube live I’ve downloaded from the internet successfully using this command :

  ffmpeg -re -i "C:\video.flv" -c:v libx264 -preset slow -crf 18 -c:a copy -f flv "rtmp://a.rtmp.youtube.com/live2/xyz"

  When I try to stream a video that’s been recorded from a specific device, that is also flv and with same command, it’s not working. FFMpeg says it’s transmitting, no errors there. In the live dashboard on YouTube I get a green "Starting" briefly but then it goes grey to say it’s not receiving data. The only difference is the actual flv files.

  Any idea why YouTube Live would say it’s not receiving any data instead of giving me an error, when it clearly is receiving it because it works with other video files ? Thanks

• avcodec/srtenc : Don't copy data around unnecessarily

  17 février 2024, par Andreas Rheinhardt

  avcodec/srtenc : Don't copy data around unnecessarily
  Using av_bprint_init_for_buffer() avoids copying data
  
  into the internal AVBPrint buffer (or worse : to allocate
  
  a temporary buffer in case the internal buffer does not
  
  suffice). It also ensures that the data is always
  
  0-terminated, whereas the current code never does this
  
  and returns success in case the length of the
  
  string to write and the size of the buffer coincide.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/srtenc.c

• 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 ?