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• Using GDIgrab in FFmpeg with dshow Audio produces black screen

  16 mars 2016, par Spreadys

  here is my command :

  ffmpeg -f gdigrab -framerate 25 -offset_x 10 -offset_y 10 -show_region 1 -draw_mouse 1 -video_size 1280x720 -i desktop -f dshow -i audio="Microphone (2- ATR USB microphone)" -r 25 -threads 4 -c:v libx264 -pix_fmt yuv422p -preset superfast -tune fastdecode -x264opts keyint=25:min-keyint=1 -crf 4 -c:a aac -profile:a aac_low -async 25 "C:\Users\david\Desktop\%output%.mp4"

  The gdigrab video works great when it is on its own (no audio). The audio works fine when it is on its own (no video). When I join the two commands to capture both together, as soon as I move a window within my capture area, the area goes black.

  In Windows 7, I used to get around this by stopping the desktop composition service prior to capture, (SC stop uxsms), but this is now not possible in Win10.

  I thought it may be something graphics card related.
  My main monitor is on an Nvidia card, with my second running from the onboard Intel. This is setup for Quicksync H264 playback and encoding with my NLE.

  I know that I could use a dshow screen capture driver such as UScreen but am trying to avoid that as I need the capture area to be specified each time from a simple batch.

  Any help appreciated to solve this black area problem- its driving me crazy !
  David

• Add or set video width and height to muliple mkv file name property

  20 mai 2023, par Mike Dias

  I have a lot of .mkv files that are missing the video file properties. I'm using Windows. The area I refer to is in the file properties, if select the Details tab > Video section.

  


  I need to somehow write to the tag "Frame width" and "Frame height" of what the native video is - there's too many files and they're all of different Frame width and height.

  


  Is there a way to do using a batch script and ffmpeg.exe, or another tool ?

  


  I've tried ffmpeg, Handbrake, JMkvpropedit v1.5.2 and MediaInfo.

  


• HOW TO APPLY TRANSITION EFFECTS IN FFMPEG ? [closed]

  8 janvier 2023, par SMART

  I have 7 videos with audio, i tried to apply transition effects on these files, written code in python for this , i got error .

  


  python code :
import subprocess as sp

  


      def runffmpeg(cmd):
        try:
            pipe = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            ffmpeg_output, _ = pipe.communicate()
    
            print(ffmpeg_output)
            return (ffmpeg_output)
    
        except sp.CalledProcessError as err:
            print("FFmpeg stdout output on error:\n" + err.output)
    
    def get_duration(fn):
        cmd = (
            f"ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 {fn}")
    
        cmd1 = (
            f"ffprobe -v error -of flat=s_ -select_streams 1 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 {fn}")
        try:
            pipe = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            viddur, _ = pipe.communicate()
    
            print(viddur)
    
            pipe = sp.Popen(cmd1, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            auddur, _ = pipe.communicate()
    
            try:
                auddur = float(auddur.strip())
            except:
                auddur = 0
    
            print(auddur)
    
            # if (len(auddur) == 0):
            #     auddur = 0
    
            return float(viddur.strip()), (auddur)
    
        except sp.CalledProcessError as err:
            print("FFmpeg stdout output on error:\n" + err.output)
    
    
    def trans(clips, effects, out="trans.mp4"):
        filtc = " [v1][v2]xfade=wipedown:duration=1:offset=4[x1];"
        i = 0
        fcv = ""
        fca = ""
        d1 = 0
        af = ""
        dur = []
        aud = []
        inp = ""
        j = 0
        print(len(clips))
    
        for x in clips:
            print(x[0])
            inp = (inp + " -i " + x)
    
            print(effects[0])
            print(x)
    
            v, a = get_duration(fn=x)
            dur.append(v)
    
        k = 0
        for x in dur:
    
            if (k == 0):
                fca = (fca + f"[{k}:a]adelay=0|0 [a{k+1}];")
            else:
                fca = (fca + f"[{k}:a]adelay={d1}|{d1} [a{k+1}];")
            aud.append(f"[a{k+1}]")
            k = (k+1)
            d1 = (d1+((x*1000)+3.5))
    
        d1 = 0
        for x in efects:
            for v in range(0, j+1, +1):
                d1 = (d1 + dur[v])
                d1 = (d1-((v+1)*3.5))
            # [0:a]adelay=0|0 [a1];
            if (i > 1):
    
                try:
                    fcv = (
                        fcv+f"[x{(i)}][{(i)}:v]xfade={x}:duration=3:offset={d1} [x{(i+1)}];")
                except:
                    pass
            else:
                print("j = %d" % j)
                fcv = (
                    fcv+f"[{(i)}:v][{(i+1)}:v]xfade={x}:duration=3:offset={d1} [x{(i+1)}];")
    
            j = (j+1)
            i = (i+1)
    
        for a in aud:
            af = (af+a)
        af = (af+f"amix=inputs={len(aud)} [faud]")
    
        inp = (inp+" -filter_complex \"")
        cmd = (
            f"ffmpeg {inp} {fcv} {fca} {af} \" -pix_fmt yuv420p -map \"[x{i}]\" -map \"[faud]\" -y {out}")
    
        print(cmd)
    
        try:
            pipe = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.STDOUT,
                            universal_newlines=True)
    
            ffmpeg_output, _ = pipe.communicate()
    
            print(ffmpeg_output)
    
        except sp.CalledProcessError as err:
            print("FFmpeg stdout output on error:\n" + err.output)
            
            


  


  these functions creates ffmpeg code like :
ffmpeg -i out1.mp4 -i out2.mp4 -i out3.mp4 -i out4.mp4 -i out5.mp4 -i out6.mp4 -i out7.mp4 -filter_complex " [0:v][1:v]xfade=wipedown:duration=3:offset=6.006009000000001 [x1] ;[1:v][2:v]xfade=dissolve:duration=3:offset=14.030023 [x2] ;[x2][2:v]xfade=pixelize:duration=3:offset=20.572042000000003 [x3] ;[x3][3:v]xfade=vuslice:duration=3:offset=21.621068000000008 [x4] ;[x4][4:v]xfade=radial:duration=3:offset=14.188099000000015 [x5] ;[x5][5:v]xfade=vertopen:duration=3:offset=-5.737862999999978 [x6] ; [0:a]adelay=0|0 [a1] ;[1:a]adelay=9509.509|9509.509 [a2] ;[2:a]adelay=18531.014000000003|18531.014000000003 [a3] ;[3:a]adelay=27552.519000000004|27552.519000000004 [a4] ;[4:a]adelay=36063.026000000005|36063.026000000005 [a5] ;[5:a]adelay=45084.531|45084.531 [a6] ;[6:a]adelay=53595.038|53595.038 [a7] ; [a1][a2][a3][a4][a5][a6][a7]amix=inputs=7 [faud] " -pix_fmt yuv420p -map "[x6]" -map "[faud]" -y trans.mp4

  


  this ffmpeg command generates error :

  


      ffmpeg version 2022-12-25-git-eeb280f351-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
      built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
      configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
      libavutil      57. 43.100 / 57. 43.100
      libavcodec     59. 55.103 / 59. 55.103
      libavformat    59. 34.102 / 59. 34.102
      libavdevice    59.  8.101 / 59.  8.101
      libavfilter     8. 53.100 /  8. 53.100
      libswscale      6.  8.112 /  6.  8.112
      libswresample   4.  9.100 /  4.  9.100
      libpostproc    56.  7.100 / 56.  7.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out1.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.51, start: 0.000000, bitrate: 1358 kb/s
      Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1303 kb/s, 26.94 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 51 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'out2.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 1060 kb/s
      Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1007 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #1:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'out3.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 1228 kb/s
      Stream #2:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1178 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #2:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 46 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'out4.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:08.51, start: 0.000000, bitrate: 987 kb/s
      Stream #3:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 938 kb/s, 26.57 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #3:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 43 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #4, mov,mp4,m4a,3gp,3g2,mj2, from 'out5.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 1221 kb/s
      Stream #4:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1170 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #4:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 47 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #5, mov,mp4,m4a,3gp,3g2,mj2, from 'out6.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:08.51, start: 0.000000, bitrate: 1073 kb/s
      Stream #5:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 1027 kb/s, 26.57 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #5:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 41 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Input #6, mov,mp4,m4a,3gp,3g2,mj2, from 'out7.mp4':
      Metadata:
        major_brand     : isom
        minor_version   : 512
        compatible_brands: isomiso2avc1mp41
        encoder         : Lavf59.34.102
      Duration: 00:00:09.02, start: 0.000000, bitrate: 757 kb/s
      Stream #6:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/unknown/unknown, progressive), 1080x1920, 705 kb/s, 26.73 fps, 25 tbr, 1000k tbn (default)
        Metadata:
          handler_name    : VideoHandler
          vendor_id       : [0][0][0][0]
          encoder         : Lavc59.55.103 libx264
      Stream #6:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 46 kb/s (default)
        Metadata:
          handler_name    : SoundHandler
          vendor_id       : [0][0][0][0]
    Filter xfade:default has an unconnected output


  


  Filter xfade:default has an unconnected output , what does it mean ?

  


  in adelay area , getting -ve nos , what to do ?

  


  #useage :

  


  vc = ["C1.mp4", "C2.mp4", "C3.mp4", "C4.mp4", "C5.mp4", "C6.mp4", "C7.mp4"]

  


      i = 1
    gc = []
    for x in vc:
        gc.append(f"out{i}.mp4")
        i = (i+1)
    
    print(gc)
    
    trans(clips=gc, effects=efects)


  


  system details :
windows 10 64 bits
python 3.9 64 bits