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• Python - ffmpeg (commands to start, stop recording)

  24 novembre 2017, par J. Foe

  I need a programme that would open cmd and have a command to start recording in cmd and to stop recording in cmd

  import win32com.client
  
  from datetime import datetime
  
  import time
  
  
  
  shell = win32com.client.Dispatch("WScript.Shell")
  
  shell.run("cmd") #run's command panel
  
  shell.AppActivate("cmd")
  
  time.sleep(3) #wait's 3 seconds
  
  shell.SendKeys('ffmpeg -y -f dshow -i video="Logitech HD Webcam C270"  
  
  kamera.mp4') #type's in cmd the following (start's recording)
  
  time.sleep(3)
  
  shell.SendKeys("{ENTER}") #enter is pressed in cmd
  
  time.sleep(6)
  
  shell.SendKeys('exit')
  
  shell.SendKeys("{ENTER}") #here is a problem, the proggrame wont shutdown after 6 sec

  I could use -t 00:00:03 in ffmpeg, but I need to close the programme by command

• fftools/ffmpeg : stop accessing av_stream_get_parser() from the main thread

  18 août 2022, par Anton Khirnov

  fftools/ffmpeg : stop accessing av_stream_get_parser() from the main thread
  It races with the demuxing thread. Instead, send the information along
  
  with the demuxed packets.
  Ideally, the code should stop using the stream-internal parsing
  
  completely, but that requires considerably more effort.
  Fixes races, e.g. in :
  
   fate-h264-brokensps-2580
  
   fate-h264-extradata-reload
  
   fate-iv8-demux
  
   fate-m4v-cfr
  
   fate-m4v
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_demux.c

• Ffmpeg hls segment stop segmenting after 5300 segments

  9 avril 2019, par Hug Duino

  I’m trying to make a http video streaming using hls, ffmpeg and raspivid and I need a replay time of 1 day but after 5300 segments ffmpeg stop segmenting and continue writing the video to the 5301 segment for the end of the day (5300/5301 is an average number, +- 50 segments)
  I have plenty of storage space, my camera can record all the day. The only problem is ffmpeg who decide to stop segmenting after 5300 segments

  Thank you and sorry for my poor english ^^

  Here is my streaming script :

  base="/var/www/html/"
  
  
  
  set -x
  
  
  
  rm -rf /var/www/html/ppc/saves/live live.h264
  
  mkdir -p /var/www/html/ppc/saves/live
  
  
  
  # fifos seem to work more reliably than pipes - and the fact that the
  
  # fifo can be named helps ffmpeg guess the format correctly.
  
  mkfifo live.h264
  
  raspivid -a 1036 -w 1640 -h 1232 -fps 15 -t 37200000 -b 1500000 -o - | psips > live.h264 &
  
  
  
  # Letting the buffer fill a little seems to help ffmpeg to id the stream
  
  sleep 2
  
  
  
  # Need ffmpeg around 1.0.5 or later. The stock Debian ffmpeg won't work.
  
  # I'm not aware of options apart from building it from source. I have
  
  # Raspbian packags built from Debian Multimedia sources. Available on
  
  # request but I don't want to post them publicly because I haven't cross
  
  # compiled all of Debian Multimedia and conflicts can occur.
  
  ffmpeg -y -r 15 -i live.h264 -f alsa  -i default:CARD=C525 -r:a 48000 -ac 1 -af adelay=32s -c:v copy -c:a aac -b:a 128k -map 0:0 -map 1:0 -r 30 \
  
   -f segment \
  
   -segment_time 7 \
  
   -segment_format mpegts \
  
   -segment_list /var/www/html/ppc/saves/live/live.m3u8 \
  
   -segment_list_flags live \
  
   -segment_list_type m3u8 \
  
   -initial_offset -9 \
  
   -strict 2 /var/www/html/ppc/saves/live/%08d.ts < /dev/null```