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• Using ffmpeg to "re-time" an RTSP stream ?

  29 mars 2021, par Tom S

  I recently set up a birdbox in my garden, and have been using a cheapie camera that I bought, along with ffmpeg on a raspberry pi to stream from the camera to YouTube.

  


  But YouTube keeps telling me that I am sending data too fast - multiple seconds of video per second, and at that point the stream seems to stall and I just get a buffering spinner on YouTube and have to restart ffmpeg to restore the stream.

  


  This is happening very frequently, infact even more frequently now than when I originally got everything up and running for some reason... So much so that Ive had to setup ffmpeg to run as a service, and restart it once an hour via cron. But even this is not enough and now it seems that it can go bonkers within 10-15 minutes of a restart - almost like the more often I restart the quicker it gets...

  


  I dont know where the issue is, or how to find it (does ffmpeg simply restream "verbatim" what ever the camera supplies ?), but I wonder if it might be possible to have ffmpeg re-time the stream so that I only send to YouTube the 25fps that it is happy with (i.e. dropping any frames in excess of this) ?

  


  I have key frames set to 1 second on the camera.

  


  Thanks !

  


  ---

  


  Here is my service file which contains the command that I use to start ffmpeg :

  


  [Unit]
Description=BirbCam 1 streaming service
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple
Restart=always
RestartSec=1
User=root
# Uncomment one ExecStart line below, then run `sudo systemctl daemon-reload` before restart
# With audio
ExecStart=/usr/local/bin/ffmpeg -rtsp_transport tcp -i rtsp://172.25.144.35:554/user=admin&password=&channel=1&stream=0.sdp?real_stream -tune zerolatency -vcodec libx264 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx-xxxx

# Without audio
# ExecStart=/usr/local/bin/ffmpeg -f lavfi -i anullsrc -rtsp_transport tcp -i rtsp://172.25.144.35:554/user=admin&password=&channel=1&stream=0.sdp?real_stream -tune zerolatency -vcodec libx264 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx-xxxx

[Install]
WantedBy=multi-user.target


  


• Errno 20 Not a directory : 'ffmpeg' WHEN running with systemd

  4 avril 2022, par Ivan Arturo Salazar Ortiz

  Hi guys I have a head ache running this as a service I am really stuck here and have wasted quite the hours here, i am on ubuntu 20 LTS.

  


  I have a celery worker which is waiting for an audio to transform using ffmpeg python library.

  


  If I run it like this :

  


  source venv/bin/activate && Celery -A tasks worker -l info It works without a problem and complete the tasks.

  


  but when I run it as a service in systemd I get this error :

  


  [Errno 20] Not a directory: 'ffmpeg'
                                              Traceback (most recent call last):
                                                File "/home/ubuntu/p1-react-flask-app/app/tasks.py", line 58, in transform_audio_format
                                                  output.run()
                                                File "/home/ubuntu/p1-react-flask-app/app/venv/lib/python3.8/site-packages/ffmpeg/_run.py", line 313, in run
                                                  process = run_async(
                                                File "/home/ubuntu/p1-react-flask-app/app/venv/lib/python3.8/site-packages/ffmpeg/_run.py", line 284, in run_async
                                                  return subprocess.Popen(
                                                File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
                                                  self._execute_child(args, executable, preexec_fn, close_fds,
                                                File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
                                                  raise child_exception_type(errno_num, err_msg, err_filename)
                                              NotADirectoryError: [Errno 20] Not a directory: 'ffmpeg'


  


  I really do not know why and have tried different ways. python os can access the audio folder and files without problem but the problem here, I think, is that my systemd service does not find ffmpeg.exe, but how do I specify it to my service ?

  


  My celery config file :

  


  # The names of the workers. This example create one worker
CELERYD_NODES="worker1"

# The name of the Celery App, should be the same as the python file
# where the Celery tasks are defined
CELERY_APP="tasks"

# Log and PID directories
CELERYD_LOG_FILE="/var/log/celery/%n%I.log"
CELERYD_PID_FILE="/var/run/celery/%n.pid"

# Log level
CELERYD_LOG_LEVEL=INFO

# Path to celery binary, that is in your virtual environment
CELERY_BIN=/home/ubuntu/venv/bin/celery

# Options for Celery Beat
CELERYBEAT_PID_FILE="/var/run/celery/beat.pid"
CELERYBEAT_LOG_FILE="/var/log/celery/beat.log"


  


  my celeryd.service :

  


  [Unit]
Description=Celery Service
After=network.target

[Service]
Type=forking
User=ubuntu
Group=ubuntu
EnvironmentFile=/etc/default/celeryd
WorkingDirectory=/home/ubuntu/p1/app
ExecStart=/bin/sh -c '${CELERY_BIN} multi start ${CELERYD_NODES} \
-A ${CELERY_APP} --pidfile=${CELERYD_PID_FILE} \
--logfile=${CELERYD_LOG_FILE} --loglevel=${CELERYD_LOG_LEVEL} ${CELERYD_OPTS}'
ExecStop=/bin/sh -c '${CELERY_BIN} multi stopwait ${CELERYD_NODES} \
--pidfile=${CELERYD_PID_FILE}'
ExecReload=/bin/sh -c '${CELERY_BIN} multi restart ${CELERYD_NODES} \
-A ${CELERY_APP} --pidfile=${CELERYD_PID_FILE} \
--logfile=${CELERYD_LOG_FILE} --loglevel=${CELERYD_LOG_LEVEL} ${CELERYD_OPTS}'

[Install]
WantedBy=multi-user.target


  


  My python code :

  


  @app.task
def transform_audio_format(url_original,url_destiny):
    input = ffmpeg.input(url_original)
    
    output = ffmpeg.output(input,url_destiny,shell=True)

    output.run()


  


  any help would be appreciated.

  


• libavformat/mpegtsenc : allow to set service_type in sdt

  2 février 2015, par dhead666

  libavformat/mpegtsenc : allow to set service_type in sdt
  This adds an option to set the service type in mpegts as defined in ETSI 300 468.
  I added what I believe are the most useful service types as pre defined values,
  
  the others can be sent by using their hexdecimal form directly (e.g. -mpegts_service_type digital_radio, -mpegts_service_type 0x07).
  I’ve been using this patch in order to pipe internet radio stream (originally as HLS/m3u8) from ffmpeg to tvheadend,
  
  when the service type set right tvheadend recognize the mpegts stream as a radio channel.
  The patch in its original form was written by linuxstb from freenode’s hts channel which allowed me pushing it upstream.
  This close issue 4118.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/mpegtsenc.c