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• avcodec/vp8 : Move codec-specific init code out of common init

  6 mars, par Andreas Rheinhardt

  avcodec/vp8 : Move codec-specific init code out of common init
  While just at it, also move the init functions inside
  
  the #if CONFIG_VP ?_DECODER (to avoid linking failures).
  
  While just at it, also declare these init functions
  
  as av_cold and uninline the remaining common init function.
  Reviewed-by : Peter Ross <pross@xvid.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/vp8.c

• What does the left_block_options array represent in the fill_decode_neighbors function of FFmpeg？

  28 décembre 2024, par mike xu

  I am studying the source code of FFmpeg, specifically the fill_decode_neighbors function. I am trying to understand how the decoding process works, especially the usage of the left_block_options array.
Here is the relevant code snippet :

  


  static const uint8_t left_block_options[4][32] = {
        { 0, 1, 2, 3, 7, 10, 8, 11, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4, 3 + 3 * 4, 1 + 4 * 4, 1 + 8 * 4, 1 + 5 * 4, 1 + 9 * 4 },
        { 2, 2, 3, 3, 8, 11, 8, 11, 3 + 2 * 4, 3 + 2 * 4, 3 + 3 * 4, 3 + 3 * 4, 1 + 5 * 4, 1 + 9 * 4, 1 + 5 * 4, 1 + 9 * 4 },
        { 0, 0, 1, 1, 7, 10, 7, 10, 3 + 0 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 1 * 4, 1 + 4 * 4, 1 + 8 * 4, 1 + 4 * 4, 1 + 8 * 4 },
        { 0, 2, 0, 2, 7, 10, 7, 10, 3 + 0 * 4, 3 + 2 * 4, 3 + 0 * 4, 3 + 2 * 4, 1 + 4 * 4, 1 + 8 * 4, 1 + 4 * 4, 1 + 8 * 4 }
    };


  


  While I understand that this array plays a role in determining neighboring blocks for decoding, I am unclear about :

  


  The specific meaning of the array values.
How this array interacts with the decoding process, especially in relation to intra-prediction or block positioning.
Instead of a detailed explanation, I would greatly appreciate :

  


  Any keywords I can look up to understand this topic better (e.g., terms from the H.264 standard or FFmpeg documentation).
Links to related documentation, articles, or sections in the H.264 specification.
Suggestions on where I might find similar examples or detailed discussions about intra-block neighbor handling in FFmpeg.
Thank you for any resources or pointers you can provide !

  


• Failed to find two consecutive MPEG audio frames [closed]

  3 décembre 2024, par matrixebiz

  I'm receiving this error trying to download/convert an m3u8

  


  [mp3 @ 000001c8f5112200] Format mp3 detected only with low score of 1, misdetection possible!
[mp3 @ 000001c8f5112200] Failed to find two consecutive MPEG audio frames.
[in#0 @ 000001c8f5111f40] Error opening input: Invalid data found when processing input


  


  Any way to fix this in my ffmpeg command line ? Also, playing the stream in VLC and other apps shows this in the path /%EF%BB%BF for some reason.
VLC is unable to open the MRL 'file :///C :/Temp/%EF%BB%BF'. Check the log for details. Then it will play the actual video.

  


  Do i need to change the beginning of the m3u8 ?
#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1000,RESOLUTION=640x360,

  


  Even if I remove it and just leave the URL that is inside the m3u8, will still display the %EF%BB%BF which I need to stop from happening

  


  EDIT : Adding the PowerShell script I'm using to output my file :

  


  function Replace-FileText
{
    [CmdletBinding()]
    Param
    (
        $File1,
        $File2,
        $File1StartAnchor,
        $File1EndAnchor = "$",
        $File2StartAnchor,
        $File2EndAnchor = "$"
    )
    
    #Escape the regex meta characters, this assumes literals are used in the input
    $File1StartAnchorEscaped = [System.Text.RegularExpressions.Regex]::Escape($File1StartAnchor)
    $File2StartAnchorEscaped = [System.Text.RegularExpressions.Regex]::Escape($File2StartAnchor)

    if ($PSBoundParameters.ContainsKey('File1EndAnchor'))
    {
        $File1EndAnchorEscaped = [System.Text.RegularExpressions.Regex]::Escape($File1EndAnchor)
    }
    else
    {
        $File1EndAnchorEscaped = $File1EndAnchor
    }

    if ($PSBoundParameters.ContainsKey('File2EndAnchor'))
    {
        $File2EndAnchorEscaped = [System.Text.RegularExpressions.Regex]::Escape($File2EndAnchor)
    }
    else
    {
        $File2EndAnchorEscaped = $File2EndAnchor
    }


    if ((Get-Content $File1 -Raw) -match "$File1StartAnchorEscaped(.*?)$File1EndAnchorEscaped")
    {
        Write-Host "Found the following string in between the anchors in $File1 :$($Matches[1])"
        $TextToInject = $Matches[1]
    }
    else
    {
        Write-Host "Could not find the Start and end Anchors in $File1"
        return
    }
 
    if ((Get-Content $File2 -Raw) -match "$File2StartAnchorEscaped(.*?)$File2EndAnchorEscaped")
    {
        Write-Host "Found the following string in between the anchors in $File2 :$($Matches[1])"
        $TextToReplace = $Matches[1]
    }
    else
    {
        Write-Host "Could not find the Start Anchor in $File2"
        return
    }
 
    (Get-Content $File2 -Raw) -replace $TextToReplace,$TextToInject | Out-File $File2 -NoNewline
}
 
 
Replace-FileText -File1 'C:\EQDA\File1.txt' -File2 'C:\EQDA\File2.txt' -File1StartAnchor 'two' -File1EndAnchor '"' -File2StartAnchor 'four'
Replace-FileText -File1 'C:\EQDA\File1.txt' -File2 'C:\EQDA\File2.txt' -File1StartAnchor 'server-' -File1EndAnchor '-name' -File2StartAnchor 'server-' -File2EndAnchor '-name'