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• How to decode and display real-time H264 stream using ffmpeg in Python ?

  25 mars 2022, par yiiiiiiiran

  I would like to port the live stream to ffmpeg and display it in real time using Python.

  


  Anyone knows how to port the stream to PIPE ? And in the mean time to display it after decoding ?

  


  I managed to get real-time stream from my Raspberry Pi3 to Windows PC, using RS232 connection with Baud Rate 2M.

  


  The format of the stream is in H264. The data package I get for each frame is in .
In order for the program to know when does each package ends, I've add

  


  bytes([0xcc,0xdd,0xee,0xff])


  


  to the end of package. So that my serial port will read for a package until it sees those bytes.

  


  Lets assume the stream WIDTH, HEIGHT, NUM_FRAMES, FPS = 320, 240, 90, 30

  


  I have the command for decode the h264 stream :

  


  cmd = ["C:/XXXXXX/ffmpeg.exe",
    "-probesize", "32",
    "-flags", "low_delay",
    "-f", "h264",
    "-i", "pipe:",
    "-f", "rawvideo", "-pix_fmt", "rgb24", "-s", "384x216",
    "pipe:"]

decode_process = sp.Popen(cmd, stdin=sp.PIPE, stdout=sp.PIPE)


  


  The stream package I got is

  


  while datetime.now() &lt; end_time:&#xA;    pkg = ser.read_until(expected=bytes([0xcc,0xdd,0xee,0xff])) #output <class>&#xA;    frame_len = len(pkg)-4&#xA;    frame_inBytes = pkg[0:frame_len]&#xA;    decode_process.stdin.write(frame_inBytes)&#xA;</class>

  


  I want to write the real time stream to PIPE however it shows error :

  


  [h264 @ 0000017322a3e980] missing picture in access unit with size 48
[h264 @ 0000017322a3e980] no frame!
[h264 @ 0000017322a2d240] Stream #0: not enough frames to estimate rate; consider increasing probesize
[h264 @ 0000017322a2d240] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (32) options        
Input #0, h264, from 'pipe:':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264, none, 25 tbr, 1200k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
[h264 @ 0000017322a3f180] no frame!
Error while decoding stream #0:0: Invalid data found when processing input
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed!


  


• How to capture movie with Gphoto2 + ffmpeg and redirect serve to html embed

  1er avril 2021, par Doglas Antonio Dembogurski Fei

  Iam trying to capture video from Panasonic DC-GH5 camera to serve this and access from browser withoud ffserver because ffserver is deprecated

  


  Iam using Ubuntu 20.04

  


  #gphoto2 -v


gphoto2         2.5.23         gcc, popt(m), exif, cdk, aa, jpeg, readline
libgphoto2      2.5.25         standard camlibs (SKIPPING lumix), gcc, ltdl, EXIF
libgphoto2_port 0.12.0         iolibs: disk ptpip serial usb1 usbdiskdirect usbscsi, gcc, ltdl, EXIF, USB, serial without locking


  


  Iam try this code

  


  ffmpeg -f video4linux2 -s 640x480 -r 30 -i /dev/video0 -thread_queue_size 512 -ac 1 -f alsa -i pulse -f webm -listen 1 -seekable 0 -multiple_requests 1 http://localhost:8090


  


  and embed

  


  <video src="http://localhost:8090"></video>&#xA;

  


  in index.php but don`t appear anything.
If anyone knows a way to make a server for a specific port I would appreciate it
Thank you.

  


• How to access builtin webcam from a docker container using ffmpeg ?

  1er novembre 2020, par philippos

  I have wrote my code that captures videos by my builtin webcam of my MAC using ffmpeg.

  On local machine, the code works fine. However, I built a docker container of my code, and tried to run it, but I got the following error :

  


  error: Command failed: ffmpeg -f avfoundation -framerate 30 -i "0" -target pal-vcd -vf scale=640x480 -flags +global_header -f segment -segment_time 10 -segment_list ../out.csv -segment_format_options movflags=+faststart -reset_timestamps 1 -strftime 1 %Y%m%d-%H%M%S.mp4
ffmpeg version git-2016-05-25-9591ca7 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-openssl
  libavutil      55. 24.100 / 55. 24.100
  libavcodec     57. 43.100 / 57. 43.100
  libavformat    57. 37.100 / 57. 37.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 46.100 /  6. 46.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Unknown input format: 'avfoundation'


  


  

  1. as far as what I understood from this log, is that the docker
container doesn't have access to local devices.
     According to
this discussion Docker - a way to give access to a host USB or
serial device ? , I need to use the --device flag to pass my
device's location.
     However, according to this answer,
that is not possible ?

  


  2. In addition to what I've mentioned
above, I couldn't get my webcam's path at the first place. what is
a correct path for macbook webcam

  


  


  My question is : How to access my MAC's builtin camera to record from a docker container ?