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• lavu/hwcontext_qsv : Use vendor id to create device

  26 juillet 2024, par Fei Wang

  lavu/hwcontext_qsv : Use vendor id to create device
  New kernel driver "xe" will be supported from Lunar Lake instead of
  
  "i915".
  "xe" kernel driver :
  
  https://github.com/torvalds/linux/tree/master/drivers/gpu/drm/xe
  Signed-off-by : Fei Wang <fei.w.wang@intel.com>
  

  • [DH] libavutil/hwcontext_qsv.c

• hwcontext_vulkan : rewrite upload/download

  18 juillet 2024, par Lynne

  hwcontext_vulkan : rewrite upload/download
  This commit was long overdue. The old transfer dubiously tried to
  
  merge as much code as possible, and had very little in the way
  
  of optimizations, apart from basic host-mapping.
  The new code uses buffer pools for any temporary bufflers, and
  
  handles falling back to buffer-based uploads if host-mapping fails.
  Roundtrip performance difference :
  
  ffmpeg -init_hw_device "vulkan=vk:0,debug=0,disable_multiplane=1" -f lavfi \
  
   i color=red:s=3840x2160 -vf hwupload,hwdownload,format=yuv420p -f null -
  7900XTX :
  
  Before : 224fps
  
  After : 502fps
  Ada, with proprietary drivers :
  
  Before : 29fps
  
  After : 54fps
  Alder Lake :
  
  Before : 85fps
  
  After : 108fps
  With the host-mapping codepath disabled :
  
  Before : 32fps
  
  After : 51fps
  

  • [DH] libavutil/hwcontext_vulkan.c
  • [DH] libavutil/vulkan.c

• Stream H264 raw data on RTSP server

  1er janvier, par Aitazaz

  I have H264 hex string data saved in a list.
The data is in correct format as it is being received, I am trying to stream it to RTSP server.

  


  I have stream the data in realtime as it is from a dashcam.

  


  The RTSP server is deployed but when I stream frames to it, the connection is created and then ends in an instant (does not last for a second)

  


  The code is mentioned below which performs this streaming task.

  


  def h264_stream_to_rtsp(data_list, rtsp_url):
    try:
        ffmpeg_command = [
            "ffmpeg", 
            "-f", "h264",
            "-i", "-",
            "-vcodec", "libx264",
            "-preset", "fast",
            "-f", "rtsp",
            "-analyzeduration", "5000000",
            "-probesize", "5000000", 
            rtsp_url  # The RTSP URL to stream to
        ]
        
        ffmpeg_process = subprocess.Popen(ffmpeg_command, stdin=subprocess.PIPE)

        for index, hex_data in enumerate(data_list):
            # print(f"Processing hex data {index + 1}/{len(data_list)}...")

            if len(hex_data) % 2 != 0:
                hex_data = '0' + hex_data  # Append a leading zero if length is odd

            binary_data = binascii.unhexlify(hex_data)

            ffmpeg_process.stdin.write(binary_data)

        ffmpeg_process.stdin.close()

        ffmpeg_process.wait()
        print("Stream completed.")

    except KeyboardInterrupt:
        print("Stopping live stream.")
    except Exception as e:
        print(f"Error: {e}")


  


  Logs from the RTSP server are mentioned below :

  


  2025/01/01 10:56:04 INF [RTSP] [conn 20.174.9.78:35474] opened
2025/01/01 10:56:04 INF [RTSP] [session 1d2bb871] created by 20.174.9.78:35474
2025/01/01 10:56:04 INF [RTSP] [session 1d2bb871] is publishing to path 'live', 1 track (H264)
2025/01/01 10:56:04 INF [RTSP] [session 1d2bb871] destroyed: torn down by 20.174.9.78:35474
2025/01/01 10:56:04 INF [RTSP] [conn 20.174.9.78:35474] closed: EOF
2025/01/01 10:56:48 INF [RTSP] [conn 20.174.9.78:54448] opened
2025/01/01 10:56:48 INF [RTSP] [session b6a95e71] created by 20.174.9.78:54448
2025/01/01 10:56:48 INF [RTSP] [session b6a95e71] is publishing to path 'live', 1 track (H264)
2025/01/01 10:56:48 INF [RTSP] [session b6a95e71] destroyed: torn down by 20.174.9.78:54448


  


  How can I stream continuously ?