Recherche avancée

Sur d’autres sites (9156)

• Using a HLS m3u8 or DASH mpd as ffmpeg input : seeking performance

  21 septembre 2020, par coder_uk

  I wonder if any FFMPEG wizards can help with this :

  


  I've seen examples (like FFmpeg code not working on http url for thumbnail extraction) of using a http URL as the input but so far only with an .mp4.

  


  If I were to instead use an ABR .m3u8/.mpd as the input (which, though a text file, does represent a video) ... is FFMPEG smart enough to work with it ? To parse it ? So ... if I gave it a 5 hour HLS VOD m3u8 as input (-i http...), and asked it for a frame at 4 hours in (-ss), would it only download that one 10s segment at the 4-hours point ? And so only need to download a small 10 second .ts file. Or does it download the whole thing ?

  


  Thanks.

  


• Why is PowerShell Eating my Dash

  11 novembre 2017, par gvkv

  In a directory vidtemp with files : G*53.mp4 (a series of GoPro videos) using PowerShell 5.0 :

  PS C:\Users\gvkv\vidtemp $sources = Get-ChildItem -Filter *53*
  
  PS C:\Users\gvkv\vidtemp $vin = [String]::Join(" ", $($sources | %{"-i $($_.Name)"}))
  
  PS C:\Users\gvkv\vidtemp $vin
  
  -i GOPR0053.MP4 -i GP010053.MP4 -i GP020053.MP4 -i GP030053.MP4 -i GP040053.MP4 -i GP050053.MP4
  
  
  
  PS C:\Users\gvkv\Videos\hockeytemp\tt\trw> $concat = [String]::Join(" ", `
  
  >> $(0..$($sources.count-1) | `
  
  >> %{"[$($_):v:0] [$($_):a:0]"}) + "concat=n=$($sources.count):v=1:a=1 [v] [a]" `
  
  >> )
  
  PS C:\Users\gvkv\vidtemp $concat
  
  PS C:\Users\gvkv\vidtemp [0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] [3:v:0] [3:a:0] [4:v:0] [4:a:0] [5:v:0] [5:a:0] concat=n=6:v=1:a=1 [v] [a]
  
  PS C:\Users\gvkv\vidtemp ffmpeg $vin `
  
  >> -filter_complex $concat -map '[v]' -map '[a]' `
  
  >> -c:v -crf 21 -preset slow 
  
  >> out.53.mp4
  
  ...
  
  Unrecognized option 'i GOPR0053.MP4 -i GP010053.MP4 -i GP020053.MP4 -i GP030053.MP4 -i GP040053.MP4 -i GP050053.MP4'. 
  
  ndError splitting the argument list: Option not found

  Note there’s no "-" on the first i. What’s happening and what do I do about it ?

• set ffprobe timeout for streaming protocols (srt,dash,hls,rtmp)

  1er avril 2024, par tester11

  I am trying to write a test where ffprobe after network stream was disconnected will try to open it only for a specified number of seconds, then return with nothing, which would signal that the stream is no more.
I tried to use

  


  


  -timeout 5

  


  


  key but ffprobe did not understand it. I will need such timeout for the 4 protocols as listed in the subject. Example

  


  ffprobe -show_format -show_streams rtmp://my_rtmp_link


  


  Edit :
By trying every single kind of timeout keys listed in ffprobe help I found that this one, one only, accomplishes what I need (in microseconds).

  


  ffprobe -show_format -show_streams rtmp://my_rtmp_link -rw_timeout 5000000


  


  So now I just wonder if it's actually the correct way to do it.