Recherche avancée

Sur d’autres sites (6449)

• avformat/rtmppkt : Convert ff_amf_get_field_value() to bytestream2

  28 juillet 2017, par Michael Niedermayer

  avformat/rtmppkt : Convert ff_amf_get_field_value() to bytestream2
  Fixes : out of array accesses
  Found-by : JunDong Xie of Ant-financial Light-Year Security Lab
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/rtmppkt.c

• Creating a PowerShell Streamer Function w/youtube-dl, ffmpeg & ffplay

  11 juillet 2017, par Adam Chilcott

  My question is in regards to combining youtube-dl, ffmpeg, ffplay and PowerShell to handle video URLs.

  Some examples I’ve seen have piped a binary stream from youtube-dl to an external player using the Windows Command Prompt as demonstrated :

  youtube-dl --output - "https://youtube.com/mygroovycontent" | mpc-hc.exe /play /close -

  This works fine in Command Prompt as it does not mangle the binary stream. If you try and run the same command in PowerShell it doesn’t handle the binary stream so well and modifies the output, making it unreadable to the external player.

  In light of this I’ve written the following PowerShell function to get around this issue. It tries to mirror a similar function I’ve written in Bash (See : https://github.com/adamchilcott/.dotfiles/blob/master/.bash_functions.d/streamer.sh)

  The reason I’ve handled youtube-dl, ffmpeg and ffplay seperately is that defining the ffmpeg binary location in youtube-dl as an external program creates some issues when passing it in PowerShell.

  I was hoping that someone could take a look at my script and provide some feedback on what I have done here and if it can be improved upon or if a better implementation is already available ?

  Best,

  Adam.

  BEGIN POWERSHELL

  Function streamer
  
  {
  
  
  
  Param
  
  (
  
  [string] $streamURL
  
  )
  
  
  
  Begin
  
  {
  
  }
  
  
  
  Process
  
  {
  
  $streamDir = "$env:TEMP\YTD.d"
  
  
  
  $ytdBin = "Z:\PortableApps\CommandLineApps\youtube-dl\youtube-dl.exe"
  
  $streamExtractor = &$ytdBin --no-warnings --get-url $streamURL
  
  
  
  $ffmpegBin = "Z:\PortableApps\CommandLineApps\ffmpeg-20170702-c885356-win64-static\bin\ffmpeg.exe"
  
  $ffplayBin = "Z:\PortableApps\CommandLineApps\ffmpeg-20170702-c885356-win64-static\bin\ffplay.exe"
  
  
  
  if 
  
  (
  
  -not (Test-Path -Path $streamDir -PathType Any)
  
  )
  
  
  
  {
  
  New-Item $streamDir -type directory -ErrorAction SilentlyContinue
  
  }
  
  
  
  Start-Process -FilePath $ffmpegBin -ArgumentList "-loglevel quiet -i $streamExtractor -c copy $streamDir\streamContainer.m2ts" -NoNewWindow -ErrorAction SilentlyContinue
  
  
  
  Do
  
  {
  
  Start-Sleep -Seconds 1
  
  } 
  
  
  
  Until 
  
  (
  
  (Get-Item $streamDir\streamContainer.m2ts -ErrorAction SilentlyContinue).Length -gt 256kb
  
  )
  
  
  
  &$ffplayBin -loglevel quiet $streamDir\streamContainer.m2ts
  
  
  
  if 
  
  (
  
  (Test-Path -Path $streamDir -PathType Any) -eq $true -and (Get-Process -Name ffplay -ErrorAction SilentlyContinue) -eq $null
  
  ) 
  
  
  
  {
  
  
  
  Do
  
  {
  
  Stop-Process -Name ffmpeg -ErrorAction SilentlyContinue
  
  }
  
  
  
  Until
  
  (
  
  (Get-Process -Name ffmpeg -ErrorAction SilentlyContinue) -eq $null
  
  )
  
  
  
  Remove-Item $streamDir -Recurse -ErrorAction SilentlyContinue
  
  }
  
  }
  
  
  
  End
  
  {
  
  }
  
  
  
  }
  
  
  
  streamer -streamURL https://www.youtube.com/watch?v=9uFXw7vKz14

  END POWERSHELL

• expected end of line but found unknown token

  17 juin 2017, par Denzil Williams

  Ok so after days of searching, here I am. I am new to ffmpeg, applescript, and terminal.

  I want to use ffmpeg to batch convert a group of selected files in any folder. I was successful in doing this by opening the terminal at the folder location and using this code :

  for f in *.flv; do ffmpeg -i "$f" -acodec libmp3lame -b:a 256k "${f%.flv}.mp3" && rm "$f"; done

  which finds all flv files, and converts it to 256 bit rate mp3, then deletes the original files.

  Now I want it to be more automated, so I looked into creating a service. I tried running an apple script through automator, which I want it to open the terminal at the folder location the file then run the code to convert the files. Here’s the code I attempted :

  tell application "Finder" to set currentFolder to target of front Finder window as text
  
  set theWin to currentFolder's POSIX path
  
  
  
  tell application "Terminal"
  
      if not (exists window 1) then reopen
  
      activate
  
      do script "cd " & quoted form of theWin & ";clear" in window 1
  
      tell application "Terminal"
  
          do script "for f in *.flv; do ffmpeg -i "$f" -acodec libmp3lame -b:a 256k "${f%.flv}.mp3" && rm "$f"; done"
  
      end tell
  
  end tell

  The first part of code opens up terminal at the folder location just fine. But when I add the part with the ffmpeg code it crashes. The error is apparently with the "$", those are what light up as the error, the error message says "Expected end of line, but found unknown token". Looking for some assistance please. I need the "$" because those are what make the loop work for renaming the files and such.