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• Combining multiple mp4s with python-ffmpeg wrapper

  30 août 2020, par Perchful

  So I'm working on a program that downloads multiple mp4s to a folder and then concats them together. I've run into a few problems while using the FFMPEG python wrapper. At first, I was able to combine the videos using the code, but there is no audio for some reason.

  


      filenames = []
        inputs = []



        dlnumber = 1

        #Actual downloading of mp4s

        while dlnumber <= len(user_timeline):
            subprocess.call(r'youtube-dl.exe ' + user_timeline[dlnumber-1]['url'] + ' -o' + str(os.getcwd()) + r'\DLvideo' '\\u' + str(dlnumber) + '.%(ext)s')
            subprocess.call('ffmpeg -i ' + str(os.getcwd()) + r'\DLvideo\u' + str(dlnumber) + '.mp4' + ' -r 60 -vf scale=1920:1080 -ar 44100 ' + str(os.getcwd())+ r'\DLvideo\f' + str(dlnumber) +'.mp4')


            filenames.append(str(os.getcwd())+ r'\DLvideo\f' + str(dlnumber) +'.mp4')
            os.remove(str(os.getcwd()) + r'\DLvideo\u' + str(dlnumber) + '.mp4')

            dlnumber +=1

        for filename in filenames:
            inputs.append(ffmpe.input(filename))

#FFMPEG CONCAT
        (   ffmpeg
            .concat(*inputs)
            .output('TEST.mp4')
            .run()
        )


  


  I've also heard about separating the audio and video, making changes, and then combining them together again, and while I was able to separate the audio and the video, I couldn't exactly figure out how to combine them individually, and then together again. Would love some help. Thanks.

  


• FFMpeg C++ How to create a filter with multiple outputs ?

  11 septembre 2020, par GoodSimon

  For example, we have one AVFrame with a size of 128x128 pixels and the task is to split the AVFrame into 4 parts (4 separate AVFrame). To do this, I fill the graph with filters using the avfilter_graph_parse2(...) function, and then call avfilter_graph_config(...).

  


  Let's start. Let's cut out the top left corner. To crop a frame, we need to use the crop filter, which means we initialize the AVFilterGraph graph with the line :

  


  buffer = width = 128: height = 128: pix_fmt = 2: time_base = 1/25, pixel_aspect = 128/64 [pad_in];
[pad_in] crop = w = 64: h = 64: x = 0: y = 0, buffersink;


  


  Everything works great ! Now let's try to make several outputs :

  


  buffer = width = 128: height = 128: pix_fmt = 2: time_base = 1/25, pixel_aspect = 128/64 [pad_in];
[pad_in] crop = w = 64: h = 64: x = 0: y = 0, buffersink;
[pad_in] crop = w = 64: h = 64: x = 64: y = 0, buffersink;
[pad_in] crop = w = 64: h = 64: x = 0: y = 64, buffersink;
[pad_in] crop = w = 64: h = 64: x = 64: y = 64, buffersink


  


  As you can see, we have one buffer for the input image, 4 crop filters for cutting each piece, and 4 buffersink filters for the output images. The call avfilter_graph_parse2(...) returns 0, which is good, but avfilter_graph_config() returns the error code -22 == AVERROR(EINVAL) and the message is output to the console : Input pad "default" with type video of the filter instance "Parsed_crop_3" of crop not connected to any source.

  


  I am asking for your help in creating a filter with multiple outputs.

  


• Show error when build win32 version Ffmpeg in windows10,How solve it ? [duplicate]

  25 septembre 2020, par lslboy

  I build a win32 version FFmpeg for get the .dll and .lib file in windows10 follow the https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT document, I executed the command

  


      ../../../configure \
--toolchain=msvc \
--disable-programs \
--disable-d3d11va \
--disable-dxva2 \
--arch=x86 \
--enable-shared \
--enable-cross-compile \
--target-os=win32 \
--extra-cflags="-MD -DWINAPI_FAMILY=WINAPI_FAMILY_APP -D_WIN32_WINNT=0x0A00" \
--extra-ldflags="-APPCONTAINER WindowsApp.lib" \
--prefix=../../../Build/Windows10/x86


  


  everything works well, after that, I execute the command :

  


  make


  


  it shows error :

  


  \Users\LEE\Downloads\ffmpeg-snapshot\ffmpeg\Output\Windows10\x86\config.h: warning C4828: The file contains a character starting at offset 0x2da, which is invalid in the current source character set (code page 65001) .
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(59): error C2143: syntax error: missing ")" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(59): error C2143: syntax error: missing "{" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(60): warning C4228: Non-standard extension used: Ignore the qualifier after the comma in the declarator list
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(60): error C2143: syntax error: missing ";" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2371: “IMFActivate”: redefinition; different base types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\um\mfobjects.h(184): note: see the statement of "IMFActivate"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2143: syntax error: missing ";" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): warning C4142: "UINT32": benign redefinition of types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2370: “UINT32”: redefinition; different storage class
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(61): error C2059: syntax error: ")"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(166): error C2143: syntax error: missing ")" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(166): error C2081: "MFT_REGISTER_TYPE_INFO": The name in the formal parameter table is illegal
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(166): error C2143: syntax error: missing "{" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(167): error C2143: syntax error: missing ";" (before "*")
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(168): error C2059: syntax error: "type"
c:\users\lee\downloads\ffmpeg-snapshot\ffmpeg\libavcodec\mf_utils.h(168): error C2059: syntax error: ")"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(54): error C2143: syntax error: missing ")" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(54): error C2143: syntax error: missing "{" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(55): warning C4228: Non-standard extension used: Ignore the qualifier after the comma in the declarator list
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(55): error C2143: syntax error: missing ";" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2371: “IMFActivate”: redefinition; different base types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\um\mfobjects.h(184): note: see the statement of "IMFActivate"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2143: syntax error: missing ";" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): warning C4142: "UINT32": benign redefinition of types
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2370: “UINT32”: redefinition; different storage class
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(81): note: see the statement of "UINT32"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(56): error C2059: syntax error: ")"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(57): error C2054: "(" should be entered after "pnumMFTActivate"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(584): error C2143: syntax error: missing ")" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(584): error C2081: "MFT_REGISTER_TYPE_INFO": The name in the formal parameter table is illegal
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(584): error C2143: syntax error: missing "{" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(585): error C2143: syntax error: missing ";" (before "*")
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(586): error C2059: syntax error: "type"
C:/Users/LEE/Downloads/ffmpeg-snapshot/ffmpegbavcodec/mf_utils.c(587): error C2059: syntax error: ")"
make: *** [/c/Users/LEE/Downloads/ffmpeg-snapshot/ffmpeg/ffbuild/common.mak:67: libavcodec/mf_utils.o] Error 2


  


  I don't know why, could you help me,thanks !