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  • dyld[16458] : Library not loaded : @rpath/libavcodec.framework/libavcodec while running my flutter app on iOS

    31 janvier 2023, par Stéphane de Luca

    Compilation is successful. But When I run the code, I get this.

    


    Here is the full trace.

    


    Any idea ?

    


    dyld[16458]: Library not loaded: @rpath/libavcodec.framework/libavcodec
  Referenced from: <3500F5CF-B1D2-30EC-8D7F-1C29BD45D05E> /private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Runner
  Reason: tried: '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/preboot/Cryptexes/OS@rpath/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/System/Library/Frameworks/libavcodec.framework/libavcodec' (errno=2, not in dyld cache)
Library not loaded: @rpath/libavcodec.framework/libavcodec
  Referenced from: <3500F5CF-B1D2-30EC-8D7F-1C29BD45D05E> /private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Runner
  Reason: tried: '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2, not in dyld cache), '/private/preboot/Cryptexes/OS/usr/lib/swift/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/private/var/containers/Bundle/Application/984D87E5-818C-49A9-9CB5-F0CC3160D2FF/Runner.app/Frameworks/libavcodec.framework/libavcodec' (errno=2), '/usr/lib/swif
dyld config: DYLD_LIBRARY_PATH=/usr/lib/system/introspection DYLD_INSERT_LIBRARIES=/usr/lib/libBacktraceRecording.dylib:/usr/lib/libMainThreadChecker.dylib:/usr/lib/libRPAC.dylib:/Developer/Library/PrivateFrameworks/DTDDISupport.framework/libViewDebuggerSupport.dylib
(lldb) 


    


    The pod is as follows :

    


    # Uncomment this line to define a global platform for your project
platform :ios, '14.0'

# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_ios_podfile_setup

target 'Runner' do
  use_frameworks!
  use_modular_headers!

  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  end
end


    


    The yaml :

    


    
environment:
  sdk: '>=2.18.2 <3.0.0'

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter
  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  video_editor: ^1.5.2
  image_picker: ^0.8.6
  helpers: ^1.2.0
  intl: ^0.17.0
  i18n_extension: ^5.0.1
  optimized_cached_image: ^3.0.1
  youtube_player_flutter: ^8.1.1
  flutter_launcher_icons: ^0.11.0
  flutter_lorem: ^2.0.0
  advance_image_picker: ^0.1.7+1
  wechat_assets_picker: ^8.1.4
  lecle_flutter_absolute_path: ^0.0.2+1
  #ffmpeg_kit_flutter: 5.1.0-LTS
  path_provider: ^2.0.11
  video_thumbnail: ^0.5.3
  flutter_document_picker: ^5.1.0
  flutter_login: ^4.1.1
  #flutter_absolute_path: ^1.0.6
  # flutter_absolute_path:
  #     git:
  #       url: https://github.com/ValeriusGC/flutter_absolute_path.git
  uuid: ^3.0.6
  flutter_form_builder: ^7.7.0
  form_builder_validators: ^8.4.0
  state_persistence: ^0.1.0
  shared_preferences: ^2.0.15
  firebase_core: ^2.4.0
  firebase_storage: ^11.0.8
  video_compress: ^3.1.2
  connectivity_plus: ^3.0.2
  internet_connection_checker: ^1.0.0+1
  cached_video_player: ^2.0.3
  visibility_detector: ^0.3.3
  firebase_database: ^10.0.7
  firebase_auth: ^4.2.1
  firebase_dynamic_links: ^5.0.9
  cloud_firestore: ^4.2.0
  cloud_functions: ^4.0.6
  cached_network_image: ^3.2.3
  ffmpeg_kit_flutter_min_gpl: ^5.1.0
  video_player: ^2.4.10
  provider: ^6.0.5
  camera: ^0.9.8+1
  share_plus: ^6.3.0
  package_info_plus: ^3.0.2

dependency_overrides:
  ffmpeg_kit_flutter_min_gpl: ^5.1.0-LTS

dev_dependencies:
  flutter_test:
    sdk: flutter


  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^2.0.0

``


    


  • Send updating image to rtmp with ffmpeg in flutter app

    19 janvier 2023, par un_cafeinoman

    I have a JPG image in a directory that I update each time I got a new one and I have to send this image to a rtmp server.
I fond that ffmpeg can do that but I thougt -loop 0 is suppose to loop over the image and see if it is refreshed but when I start my command inside my app it seem to start well and end with good Return Code (0) but don't seem to loop.

    


    Here is my ffmpeg command : '-re -loop 0 -i $pathToFile -preset ultrafast -tune zerolatency -c:v libx264 -f flv $streamUrl'

    


    This code execute the command :

    


         FFmpegKit.executeAsync(command, (session) async {

        if (ReturnCode.isSuccess(await session.getReturnCode())) {

          log('FFmpeg process exited with rc ${await session.getReturnCode()} in ${await session.getDuration()} milliseconds');

        } else if (ReturnCode.isCancel(await session.getReturnCode())) {

          log('FFmpeg process cancelled');

        } else {

          log('FFmpeg process failed with rc ${await session.getReturnCode()} in ${await session.getReturnCode()} milliseconds');

        }
      }, (session) {

        log('Message ${session.getMessage()}');

      }, (session) {

        log('Statistics ${session.toString()}');

      });


    


    And finally I got those logs :

    


    [log] Message [libx264 @ 0x7ccd0b6400] 264 - core 164 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=7 lookahead_threads=7 sliced_threads=1 slices=7 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
[log] Message Output #0, flv, to 'rtmp://stream.stream.url.com':
[log] Message   Metadata:
[log] Message     encoder         :
[log] Message Lavf59.27.100
[log] Message
[log] Message   Stream #0:0
[log] Message : Video: h264 ([7][0][0][0] / 0x0007), yuvj422p(pc, bt470bg/unknown/unknown, progressive), 640x480, q=2-31
[log] Message ,
[log] Message 25 fps,
[log] Message 1k tbn
[log] Message
[log] Message     Metadata:
[log] Message       encoder         :
[log] Message Lavc59.37.100 libx264
[log] Message
[log] Message     Side data:
[log] Message
[log] Message cpb:
[log] Message bitrate max/min/avg: 0/0/0 buffer size: 0
[log] Message vbv_delay: N/A
[log] Message
[log] Statistics Instance of 'Statistics'
[log] Message frame=    1 fps=0.0 q=20.0 size=      21kB time=00:00:00.00 bitrate=173704.0kbits/s speed= 333x
[log] Message [flv @ 0x7cf7f74d00] Failed to update header with correct duration.
[log] Message [flv @ 0x7cf7f74d00] Failed to update header with correct filesize.
[log] Statistics Instance of 'Statistics'
[log] Message frame=    1 fps=0.0 q=20.0 Lsize=      21kB time=00:00:00.00 bitrate=173864.0kbits/s speed=0.0204x
[log] Message video:21kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.513382%
[log] Statistics Instance of 'Statistics'
[log] Message frame=    1 fps=0.0 q=20.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=0.0204x
[log] Message video:21kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[log] Message [libx264 @ 0x7ccd0b6400] frame I:1     Avg QP:20.00  size: 20815
[log] Message [libx264 @ 0x7ccd0b6400] mb I  I16..4: 100.0%  0.0%  0.0%
[log] Message [libx264 @ 0x7ccd0b6400] coded y,uvDC,uvAC intra: 37.5% 22.7% 2.3%
[log] Message [libx264 @ 0x7ccd0b6400] i16 v,h,dc,p: 50% 14% 24% 12%
[log] Message [libx264 @ 0x7ccd0b6400] i8c dc,h,v,p: 78%  6% 15%  1%
[log] Message [libx264 @ 0x7ccd0b6400] kb/s:4163.00
[log] FFmpeg process exited with rc 0 in 562 milliseconds


    


    All of this in inside a Flutter app with the package ffmpeg_kit_flutter (the full gpl version of it).

    


    Any one have an idea of how to loop over constantly every time the image is updated ?

    


    Edit : I try adding -f image2 in input but it failed with :

    


    [log] Message ffmpeg version n5.1.2
[log] Message  Copyright (c) 2000-2022 the FFmpeg developers
[log] Message
I/ink.kw_deliver(30445): WaitForGcToComplete blocked ProfileSaver on HeapTrim for 28.215ms
[log] Message   built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
[log] Message   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libdav1d --enable-libkvazaar --enable-libx264 --enable-libxvid --enable-libx265 --enable-libvidstab --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-libzimg --disable-openssl --enable-zlib --enable-mediacodec --enable-gpl
[log] Message   libavutil      57. 28.100 / 57. 28.100
[log] Message   libavcodec     59. 37.100 / 59. 37.100
[log] Message   libavformat    59. 27.100 / 59. 27.100
[log] Message   libavdevice    59.  7.100 / 59.  7.100
[log] Message   libavfilter     8. 44.100 /  8. 44.100
[log] Message   libswscale      6.  7.100 /  6.  7.100
[log] Message   libswresample   4.  7.100 /  4.  7.100
[log] Message Input #0, image2, from '/data/user/0/com.kwikwink.kw_delivery/cache/images/stream.jpg':
[log] Message   Duration:
[log] Message 00:00:00.04
[log] Message , start:
[log] Message 0.000000
[log] Message , bitrate:
[log] Message N/A
[log] Message
[log] Message   Stream #0:0
[log] Message : Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 640x480
[log] Message ,
[log] Message 25 fps,
[log] Message 25 tbr,
[log] Message 25 tbn
[log] Message
[log] Message rtmp://stream.path.com: I/O error
[log] FFmpeg process failed with rc 1 in 1 milliseconds


    


  • 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

    


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