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• recording live video stream from tv card using ffmpeg at window

  16 août 2013, par user2688423

  I want to capture thumbnail every 1 second from tv card(tv signal) using ffmpeg in window.

  first of all, to record live video from tv card, I tried below.

  ffmpeg -f dshow -i video="SKYTV HD USB Maxx Video Capture" -r 20 -threads 0 D ://test.mkv

  But it didn't work.
  the Error message is

  "[dshow@000000000034d920] Could not run filter
  video=SKYTV HD USB Maxx Video Capture : Input/output error"

  I use the device called 'SKYTV HD USB Maxx Video Capture' for getting tv signal(TV card).

  (people usually suggest "ffmpeg -f oss -i dev/dsp -f video4linux2 -i dev/video0/tmp/out.mpg"
  but I dont think it works at window. this is the error message i got : "Unknown input format: 'video4linux2'")

  what should i do to record live video and get thumbnail every 1 second from tv card(tv signal) using ffmpeg in window ?

  Please help..!

• How to get Continuous live streaming without buffering in azure media player using FFMPEG(Latency is not a issue) ?

  29 août 2019, par vinay

  I am streaming from the ip camera which uses RTSP protocol and ingesting the feed to RTMP(to Azure media server) using the following command

  ffmpeg command : ffmpeg -f lavfi -i anullsrc -rtsp_transport tcp -i rtsp ://CloudAppUser:admin@192.168.8.145/MediaInput/h264/stream_1 -vcodec libx264 -t 12:00:00 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp ://channel1-cloudstream-inso.channel.media.azure.net:1934/live/980b582afc12e421b85b4jifd8e8662b/df

  I am able to watch the stream but it is buffering once in every 30 seconds , and I want to know the reason behind this buffering

  Please any one change this command , so that it should not buffer

  I am executing this command from my terminal

  I would like to watch my live stream in azure media player without any buffering and latency below 1 minute is not an issue

• Recording live stream with intermittent no audio with FFmpeg

  15 décembre 2022, par charlie-bird

  I'm trying to record a live stream with ffmpeg and having an issue with the audio.
The stream has video and audio, until it goes to video only for a few minutes and back to audio+video.
  
A : XXXXXX________YYYYYY_______ZZZZZZ
  
V : XXXXXXOOOOO0YYYYYYOOOOOZZZZZZ
  

  


  When I stop the recording and look at the output file, the absence of audio is messing stuff up. Instead of having no audio during the "breaks" ffmpeg wrote the audio track from after the break over the video, completely disconnecting audio and video
  
A : XXXXXXYYYYYYYZZZZZZZZZ
  
V : XXXXXXOOOOOOOOYYYYYYOOOOOOOZZZZZZ
  

  


  Is there an argument or parameter to force the recording of an "empty" audio track over the video when there's no audio, to keep both in sync ?

  


  Right now, not using any options

  


  ffmpeg -i "https://input.m3u8" ~/Outputfile.mp4


  


  Tried with map as below, same issue

  


  ffmpeg -i "https://input.m3u8" -map 0:a -map 0:v ~/Outputfile.mp4


  


  EDIT :
Also tried with a simple copy, in that case the audio stops but then isn't recorded when it comes back

  


  ffmpeg -i "https://input.m3u8" -map 0:a -map 0:v -c copy ~/Outputfile.ts


  


  EDIT 2 :
I've found a workaround. I re-stream the live stream using VLC on a local port and record copy with ffmpeg, and now it's all in sync

  


  ffmpeg -i "http://10.10.10.10:1234" -c copy ~/Outputfile.ts


  


  I would still like to be able to do this directly, but in the meantime that works.