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• How to convert rtmp hevc video stream to srt av1 endpoint with ffmpeg ?

  20 juin 2024, par Lulík

  i want use ffmpeg to listen rtmp stream and send to srt endpoint.

  


  Flow : smartphone (camera) -> laptop (ffmpeg script) -> desktop (obs studio)

  


  ffmpeg script show warning message and in obs stuido i can see any video only audio.

  


  Thank you in advance.

  


  Console output while running script (error in the end is bcs i stoped sending data from phone) :

  


  ffmpeg version git-2024-06-20-8d6014d Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --enable-libsvtav1 --enable-libsrt
  libavutil      59. 24.100 / 59. 24.100
  libavcodec     61.  8.100 / 61.  8.100
  libavformat    61.  3.104 / 61.  3.104
  libavdevice    61.  2.100 / 61.  2.100
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
Input #0, flv, from 'rtmp://192.168.0.194/s/streamKey':
  Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv, smpte170m/bt470bg/smpte170m), 1080x1920, 10240 kb/s, 30 fps, 120 tbr, 1k tbn
  Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp, 131 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> av1 (libsvtav1))
  Stream #0:1 -> #0:1 (aac (native) -> mp2 (native))
Press [q] to stop, [?] for help
Svt[info]: -------------------------------------------
Svt[info]: SVT [version]:   SVT-AV1 Encoder Lib 595a874
Svt[info]: SVT [build]  :   GCC 12.2.0   64 bit
Svt[info]: LIB Build date: Jun 20 2024 14:25:08
Svt[info]: -------------------------------------------
Svt[info]: Number of logical cores available: 12
Svt[info]: Number of PPCS 76
Svt[info]: [asm level on system : up to avx2]
Svt[info]: [asm level selected : up to avx2]
Svt[info]: -------------------------------------------
Svt[info]: SVT [config]: main profile   tier (auto) level (auto)
Svt[info]: SVT [config]: width / height / fps numerator / fps denominator       : 1080 / 1920 / 120 / 1
Svt[info]: SVT [config]: bit-depth / color format                   : 8 / YUV420
Svt[info]: SVT [config]: preset / tune / pred struct                    : 10 / PSNR / random access
Svt[info]: SVT [config]: gop size / mini-gop size / key-frame type          : 641 / 16 / key frame
Svt[info]: SVT [config]: BRC mode / rate factor                     : CRF / 35 
Svt[info]: SVT [config]: AQ mode / variance boost                   : 2 / 0
Svt[info]: -------------------------------------------
Svt[warn]: Failed to set thread priority: Invalid argument
Output #0, mpegts, to 'srt://192.168.0.167:9998?mode=caller':
  Metadata:
    encoder         : Lavf61.3.104
  Stream #0:0: Video: av1, yuv420p(tv, smpte170m/bt470bg/smpte170m, progressive), 1080x1920, q=2-31, 120 fps, 90k tbn
      Metadata:
        encoder         : Lavc61.8.100 libsvtav1
  Stream #0:1: Audio: mp2, 44100 Hz, stereo, s16, 384 kb/s
      Metadata:
        encoder         : Lavc61.8.100 mp2
[mpegts @ 0x55ec921d9540] Stream 0, codec av1, is muxed as a private data stream and may not be recognized upon reading.
[in#0/flv @ 0x55ec9219cc40] Error during demuxing: Input/output error1990.7kbits/s speed=0.967x    
[out#0/mpegts @ 0x55ec922247c0] video:4431KiB audio:1138KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 6.374870%
frame=  723 fps= 31 q=35.0 Lsize=    5923KiB time=00:00:24.12 bitrate=2011.3kbits/s speed=1.04x


  


  I send video stream from mobile app over rtmp encoded with hevc to my laptop where running script ffmpeg -f flv -listen 1 -i rtmp://192.168.0.194/s/streamKey -c:v libsvtav1 -f mpegts srt://192.168.0.167:9998?mode=caller. On the desktop i have obs with media source input srt://192.168.0.167:9998?mode=listener.

  


  When i run ffmpeg script without video codec option (-c:v libsvtav1) its working fine and in obs i can see video from my phone camera. With the option i can not see video only audio.
I clearly dont understand warning message : [mpegts @ 0x55ec921d9540] Stream 0, codec av1, is muxed as a private data stream and may not be recognized upon reading..
Do I need specify codec (av1) in obs media source or my ffmpeg script is wrong ?

  


• How to get webam frames one by one but also compressed ?

  29 mars, par Vorac

  I need to grab frames from the webcam of a laptop, transmit them one by one and the receiving side stitch them into a video. I picked ffmpeg-python as wrapper of choice and the example from the docs works right away :

  


  #!/usr/bin/env python

# In this file: reading frames one by one from the webcam.


import ffmpeg

width = 640
height = 480


reader = (
    ffmpeg
    .input('/dev/video0', s='{}x{}'.format(width, height))
    .output('pipe:', format='rawvideo', pix_fmt='yuv420p')
    .run_async(pipe_stdout=True)
)

# This is here only to test the reader.
writer = (
    ffmpeg
    .input('pipe:', format='rawvideo', pix_fmt='yuv420p', s='{}x{}'.format(width, height))
    .output('/tmp/test.mp4', format='h264', pix_fmt='yuv420p')
    .overwrite_output()
    .run_async(pipe_stdin=True)
)


while True:
    chunk = reader.stdout.read(width * height * 1.5)  # yuv
    print(len(chunk))
    writer.stdin.write(chunk)


  


  Now for the compression part.

  


  My reading of the docs is that the input to the reader perhaps needs be rawvideo but nothing else does. I tried replacing rawvideo with h264 in my code but that resulted in empty frames. I'm considering a third invocation looking like this but is that really the correct approach ?

  


  encoder = (                                                                     
    ffmpeg                                                                      
    .input('pipe:', format='rawvideo', pix_fmt='yuv420p', s='{}x{}'.format(width, height))
    .output('pipe:', format='h264', pix_fmt='yuv420p')                          
    .run_async(pipe_stdin=True, pipe_stdout=True)                               


  


• ffmpeg command in my Python code is not working in Docker

  12 juin 2024, par Akhil Varghese

  I am developing a Python (Django-REST) app for video processing. I need to extract the frames of videos and need to save a live stream(RSTP stream) to the desired directory.
I am using ffmpeg for saving the RTSP stream, and I have also Dockerized the app.

  


  

  • Live Stream save method

  


  


  import subprocess
@api_view(['POST'])
def saveRtsp(request):
    logger.info("Saving RTSP URL")
    rtsp_url = 'rtsp://192.168.1.117/sample2.mkv'
    rtsp_video_path = 'rtsp.mp4'
    try:
        ffmpeg_command = [
            'ffmpeg',
            '-y',
            "-analyzeduration", "20000000",
            "-probesize", "10000000",
            "-rtsp_transport", "tcp",
            "-r", "30",
            "-i", rtsp_url,
            "-c:v", "copy",
            "-b:v", "1M",
            "-c:a", "copy",
            "-b:a", "128k",
            "-f", "mp4",
            rtsp_video_path
        ]
      
      subprocess.run(ffmpeg_command)
      return True
    except Exception as e:
        logger.error(f"Failed to save RTSP URL: {e}")
        return False


  


  This is actually saving a video file in my directory with properties (as shown by "Get Info" in the MacOS Finder) :

  


  

  


  As shown in the image, the video doesn't have the resolution and codec information, so it's not compatible with players.

  


  However, If I execute the following command directly in the Docker container shell, I get a compatible video.

  


  A valid video information :

  


  

  


  As shown in the image, a compatible video has the Dimension, codecs, and Duration details in the more info section.

  


  ffmpeg -analyzeduration 20000000 -probesize 10000000 -rtsp_transport tcp -r 30  -i rtsp://xx.xx.xx.xx/sample2.mkv -c:v copy -b:v 1M -c:a copy -b:a 128k -f mp4 testoutput2.mp4


  


  My Dockerfile is :

  


  FROM python:3.9-slim

# Set environment variables
ENV PYTHONUNBUFFERED 1

# Set the working directory in the container
WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    ffmpeg \
    libsm6 \
    libxext6 \
    libx264-dev \
    libopencv-dev \
    && apt-get clean

# Copy the requirements file into the container
COPY requirements.txt /app/requirements.txt

# Install Python dependencies
RUN pip install --no-cache-dir -r /app/requirements.txt

# Copy the current directory contents into the container at /app
COPY . /app/

# Expose the port the app runs on
EXPOSE 8000

# Run the Django development server
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000"]


  


  Why does the strange behaviour happen ?
How can I fix this issue ?

  


  I tried using different codecs and even the ffmpeg-python library,
but still getting the same result.