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• Trying to record the screen with pauses (Ctrl-Z and fg) : getting audio/video desync : audio still recording after Ctrl-Z

  21 octobre 2024, par Vitaly Zdanevich

  this is my script :

  


  ffmpeg -f x11grab -video_size 1920x1200 -i :0+0,2640 \
    -f pulse -i alsa_output.usb-GN_Netcom_A_S_Jabra_EVOLVE_LINK_00113735E82E0A-00.analog-stereo.monitor \
    -f pulse -i alsa_input.usb-Focusrite_Scarlett_Solo_USB_Y7D1J3F0A66336-00.HiFi__Mic1__source \
    -filter_complex "amerge" -ac 1 \
    -vf setpts=N/FR/TB \
    -c:v libsvtav1 -preset 6 \
    -c:a libopus \
    ~/record/out/$(date +%Y-%b-%d%a--%H-%M-%S | tr A-Z a-z).webm


  


  Is something around -vf setpts=N/FR/TB ?

  


• YouTube Live Broadcast silence detect

  12 mai 2020, par Markus

  I'm trying to monitor a YouTube live broadcast for silence to be able to restart ffmpeg broadcast. How would you achieve that without breaking the YouTube ToS ?

  



  I tried with the YouTube API, but health.status is only supported for Live streams but not for broadcast.

  



  I came up with the idea of youtube-dl, grabing the m3u8 and the run ffmpeg with silencedetect but now I'm somehow stuck.

  



  Get the formats

  



  youtube-dl --list-formats https://www.youtube.com/watch?v=BiHequcIiNw


  



  Get the m3u8 manifest

  



  youtube-dl -f 91 -g https://www.youtube.com/watch?v=BiHequcIiNw


  



  Run ffprobe

  



  ffprobe -v quiet -print_format json -show_streams https://manifest.googlevideo.com/api/manifest/hls_playlist/expire/1588936061/ei/Hem0Xp35EZLl1wLLhYaYCA/ip/2a02:1205:c6bb:4590:301f:6186:c624:f2ba/id/BiHequcIiNw.0/itag/91/source/yt_live_broadcast/requiressl/yes/ratebypass/yes/live/1/goi/160/sgoap/gir%3Dyes%3Bitag%3D139/sgovp/gir%3Dyes%3Bitag%3D160/hls_chunk_host/r3---sn-nfpnnjvh-9and.googlevideo.com/playlist_duration/30/manifest_duration/30/vprv/1/playlist_type/DVR/initcwndbps/13630/mh/GY/mm/44/mn/sn-nfpnnjvh-9and/ms/lva/mv/m/mvi/2/pl/48/dover/11/keepalive/yes/fexp/23882513/mt/1588914375/disable_polymer/true/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,live,goi,sgoap,sgovp,playlist_duration,manifest_duration,vprv,playlist_type/sig/AOq0QJ8wRgIhALApv3H2YEE2GLTXIyRxw8Fu8espLgRThUfhi97DIS6-AiEAsT_4bwAfsihK6zsrKgaxMYTemlAr8BXnBTwuhwe3aAE%3D/lsparams/hls_chunk_host,initcwndbps,mh,mm,mn,ms,mv,mvi,pl/lsig/AG3C_xAwRQIgRG3c1ww23Jokzk6vfAfeZlhwEanWG_9GmwRip81v65cCIQDg1Y9pXWS4bUjpKpZ90c3icp4slmAzhQJPn2gqW0UOeQ%3D%3D/playlist/index.m3u8


  



  But I haven't found a difference in the json if the stream is up or down. Any hint how I could monitor the m3u8 if it's up or down ?

  


• FFMPEG - [WinError 2] The system cannot find the file specified

  7 avril 2021, par Jules Dany

  I'm having an issue using the FFmpeg package.

  


  Here's my code :

  


  import ffmpeg_streaming

from ffmpeg_streaming import Formats, Bitrate, Representation, Size

_360p  = Representation(Size(640, 360), Bitrate(276 * 1024, 128 * 1024))
_480p  = Representation(Size(854, 480), Bitrate(750 * 1024, 192 * 1024))
_720p  = Representation(Size(1280, 720), Bitrate(2048 * 1024, 320 * 1024))

hls = video.hls(Formats.h264())
hls.representations(_360p, _480p, _720p)
hls.output('C:/Users/juled/Videos/testStreaming')


  


  Quite simple as you can see, found it on the web.

  


  And here's the error message I have :

  


  Traceback (most recent call last):&#xA;  File "C:\Users\juled\OneDrive\Bureau\PACT\streamingMultimedia\streaming.py", line 50, in <module>&#xA;    hls.output(&#x27;C:/Users/juled/Videos/testStreaming&#x27;)&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\site-packages\ffmpeg_streaming\_media.py", line 93, in output&#xA;    self.run(ffmpeg_bin, monitor, **options)&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\site-packages\ffmpeg_streaming\_media.py", line 121, in run&#xA;    asyncio.run(self.async_run(ffmpeg_bin, monitor, **options))&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\asyncio\runners.py", line 43, in run&#xA;    return loop.run_until_complete(main)&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\asyncio\base_events.py", line 583, in run_until_complete&#xA;    return future.result()&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\site-packages\ffmpeg_streaming\_media.py", line 112, in async_run&#xA;    self._run(ffmpeg_bin, monitor, **options)&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\site-packages\ffmpeg_streaming\_media.py", line 105, in _run&#xA;    with Process(self, command_builder(ffmpeg_bin, self), monitor, **options) as process:&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\site-packages\ffmpeg_streaming\_process.py", line 58, in __init__&#xA;    self.process = _p_open(commands, **options)&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\site-packages\ffmpeg_streaming\_process.py", line 29, in _p_open&#xA;    return subprocess.Popen(shlex.split(commands), **options)&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\subprocess.py", line 800, in __init__&#xA;    restore_signals, start_new_session)&#xA;  File "C:\Users\juled\OneDrive\Bureau\Informatique\WPy64-3760\python-3.7.6.amd64\lib\subprocess.py", line 1207, in _execute_child&#xA;    startupinfo)&#xA;FileNotFoundError: [WinError 2] The system cannot find the file specified&#xA;</module>

  


  I've been checking every file quoted in the error message, but only one of them is "my" code, the others are FFmpeg and Python libraries codes.

  


  I'm using IDLEX for Python 3.7.6 on Windows by the way.

  


  I've tried to change some of the FFmpeg library code, especially where subprocess.Popen appears, by putting a shell=True in the parameters. New Error Message, different this time.

  


  I've added FFmpeg to the PATH, no change.

  


  I've reinstalled FFmpeg to be sure, but no change. I'm using this version : python-ffmpeg-video-streaming-0.1.14.

  


  Do any of you have a solution I could try ?

  


  Oh and a friend has the same issue on MAC.