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• Revision b76fd48a99 : Remove vp9_ prefix from static function names in loopfilter_16_msa Remove the c

  17 juillet 2015, par Jingning Han

  Changed Paths :
   Modify /vpx_dsp/mips/loopfilter_16_msa.c

  
  
  Remove vp9_ prefix from static function names in loopfilter_16_msa

  Remove the codec-specific global prefix from static function names.

  Change-Id : I61b2d5f2b7b5fb9dc8bc357d5493ea44df8ab19d

• How can I read all the data from a pipe and prevent it from closing ?

  23 septembre 2014, par slhck

  I’m trying to read raw YUV data from a compressed file using ffmpeg and pipes with Python.
  The ffmpeg command correctly spits out frames as raw YUV data, and I’m reading it like this :

  def read_from_pipe(pipe, amount):
  
      raw = pipe.stdout.read(amount)
  
      pipe.stdout.flush()
  
      return raw
  
  
  
  pipe_ref = subprocess.Popen('ffmpeg -i "' + input + '" -r 30 -c:v rawvideo -pix_fmt yuv420p -an -f rawvideo -t 5 -', 
  
    shell = True, 
  
    stdout = subprocess.PIPE, 
  
    bufsize=1920*1080*3*2)
  
  
  
  frame_num = 0
  
  while True:
  
      data = read_from_pipe(pipe_ref, width*height*3)
  
  
  
      # no more data
  
      if (len(data) != width*height*3))
  
          return results
  
  
  
      image = extract_image_data(data, width, height)
  
      # do something with image, put it into "results" and print frame / SSIM values to console
  
      frame_num += 1

  The problem is, as soon as ffmpeg is done converting all frames, my program stops. Since the program is a little slower than ffmpeg, it will stop receiving data and exit.

  Basically, for example, I can only work up to frame 30, then ffmpeg finishes at frame 60, and my program also exits. The command line output would say :

  Frame=25 SSIM=0.990472732391
  
  Frame=26 SSIM=0.98359411819
  
  Frame=27 SSIM=0.981074433586
  
  Frame=28 SSIM=0.97850843075
  
  frame=   60 fps= 27 q=0.0 Lsize=  182250kB time=00:00:02.00 bitrate=746496.0kbits/s dup=12 drop=0    
  
  video:182250kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead 0.000000%
  
  Frame=29 SSIM=0.977698849804
  
  frame=   60 fps= 27 q=0.0 Lsize=  182250kB time=00:00:02.00 bitrate=746496.0kbits/s dup=12 drop=0    
  
  video:182250kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead 0.000000%

  How can I get it to work on all frames that are output by ffmpeg ? Or is there any other easier way of obtaining the raw YUV data from any file if not through a pipe ? (I need it to work concurrently)

• Recursively run ffprobe to get codec types

  5 juin 2022, par Timothy Massing

  I modified @rojo code from here a little to look for h264/AC3 and to recursively run thru all the children folders. My only issue is that it always says the videos has h264 and AC3, but when I run the ffprobe command manually it states different. Am I missing something ?

  



  @if (@CodeSection == @Batch) @then
@echo off & setlocal

for /R %%f in (*.mkv, *.mp4) do (
    echo Testing %%f

    set ffprobe=C:\ffmpeg-4.0.2-win64-static\bin\ffprobe -v quiet -show_entries "stream=codec_name,height" -of json "%%f"

    for /f "delims=" %%I in ('%ffprobe% ^| cscript /nologo /e:JScript "%~f0"') do set "%%~I"

    set "pre=-hide_banner -fflags +genpts+discardcorrupt+fastseek -analyzeduration 100M"
    set "pre=%pre% -probesize 50M -hwaccel dxva2 -y -threads 3 -v error -stats"
    set "global="
    set "video=-c:v h264_nvenc"
    set "audio=-c:a ac3"

    if defined h264 if defined ac3 (
        echo %%~nf already in x264 + AC3 format.
    )

    if not defined h264 if not defined ac3 (

        if not defined ac3 (
            echo Already has AC3 audio.  Re-encoding video only.
            set "audio=-c:a copy"
        ) 

        if not defined h264 (
            echo Already has h264 video.  Re-encoding audio only.
            set "video=-c:v copy"
        )

        echo output "%%~df%%~pf%%~nf.new.mkv"
        echo C:\ffmpeg-4.0.2-win64-static\bin\ffmpeg %pre% -i "%%f" %global% %video% %audio% "%%~df%%~pf%%~nf.new.mkv"

        pause

        echo del "%%f" /f /q
        echo ren "%%~df%%~pf%%~nf.new.mkv" "%%f"
    )

)
@end // end Batch / begin JScript

var stdin = WSH.CreateObject('Scripting.FileSystemObject').GetStandardStream(0),
    htmlfile = WSH.CreateObject('htmlfile'),
    JSON;

htmlfile.write('');
htmlfile.close(JSON = htmlfile.parentWindow.JSON);

var obj = JSON.parse(stdin.ReadAll());

for (var i = obj.streams.length; i--;) {
    if (/h264/i.test(obj.streams[i].codec_name)) WSH.Echo('h264=true');
    if (/ac3/i.test(obj.streams[i].codec_name)) WSH.Echo('ac3=true');
}


  



  I had this working of a second then it stopped for not reason.

  



  @if (@CodeSection == @Batch) @then
@echo off & setlocal & goto run

:run
for /R %%f in (*.mkv, *.mp4) do (
    echo Testing %%f

    set "file=%%f"
    set "drive=%%~df"
    set "dir=%%~pf"
    set "name=%%~nf"
    set "ext=%%~xf"

    for /f "delims=" %%I in ('C:\ffmpeg-4.0.2-win64-static\bin\ffprobe.exe -v quiet -show_entries "stream=codec_name,height" -of json "%%f" ^| cscript /nologo /e:JScript "%~f0"') do (set "%%~I")

    set "pre=-hide_banner -fflags +genpts+discardcorrupt+fastseek -analyzeduration 100M"
    set "pre=%pre% -probesize 50M -hwaccel dxva2 -y -threads 3 -v error -stats"
    set "global="
    set "video=-c:v h264_nvenc"
    set "audio=-c:a ac3"

    if defined ac3 if defined h264 call :both
    if not defined ac3 call :either
    if not defined h264 call :either
)

:both
echo %name% already in x264 + AC3 format.
goto :EOF

:either
if not defined h264 (
    echo Already has AC3 audio.  Re-encoding video only.
    set "audio=-c:a copy"
) 

if not defined ac3 (
    echo Already has h264 video.  Re-encoding audio only.
    set "video=-c:v copy"
)

echo "C:\ffmpeg-4.0.2-win64-static\bin\ffmpeg %pre% -i "%file%" %global% %video% %audio% "%drive%%dir%%name%.new.mkv""
echo del "%file%" /f /q
echo ren "%drive%%dir%%name%.new.mkv" "%name%%ext%"
goto :EOF

@end // end Batch / begin JScript

var stdin = WSH.CreateObject('Scripting.FileSystemObject').GetStandardStream(0),
    htmlfile = WSH.CreateObject('htmlfile'),
    JSON;

htmlfile.write('');
htmlfile.close(JSON = htmlfile.parentWindow.JSON);

var obj = JSON.parse(stdin.ReadAll());

for (var i = obj.streams.length; i--;) {
    if (/h264/i.test(obj.streams[i].codec_name)) WSH.Echo('h264=true');
    if (/ac3/i.test(obj.streams[i].codec_name)) WSH.Echo('ac3=true');
}


  



  ffprobe Output for h264

  



  {
    "programs": [

    ],
    "streams": [
        {
            "codec_name": "h264",
            "height": 528
        },
        {
            "codec_name": "aac"
        }
    ]
}


  



  output for ac3

  



  {
    "programs": [

    ],
    "streams": [
        {
            "codec_name": "h265",
            "height": 528
        },
        {
            "codec_name": "ac3"
        }
    ]
}


  



  output for both ac3/h264

  



  {
    "programs": [

    ],
    "streams": [
        {
            "codec_name": "h264",
            "height": 528
        },
        {
            "codec_name": "ac3"
        }
    ]
}