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• i have problem in python with Muxing video and audio

  2 février 2021, par Mahmoud Ahmed

  I want to merge files video and audio but I don't know how I did try many times to fix it with ffmpeg,subprocess and moviepy with a deferent ways so this my problem and I stop work on it here if someone can help me to edit it and send to me back please .

  


  This is my code with a window .

  


  from pytube import YouTube
from tkinter import *
from tqdm import tqdm
from os import startfile
import subprocess
import shutil
import pytube
import ffmpeg
import time
import sys
import os
#Functions
def download():
    video_url = url.get()
    try:
        youtube = pytube.YouTube(video_url)
        video   = youtube.streams.filter(adaptive=True,file_extension='mp4').order_by('resolution').desc().first()
        video.download(filename='Dvideo')
        audio = youtube.streams.get_by_itag(251).download(filename='Daudio')  #webm               
        notif.config(fg="green",text="Download is Completed")



    except Exception as e:
        print(e)
        notif.config(fg="red",text="There is an Error in the Downloading Check Your url")

def Merge():
    try:
        os.system("ffmpeg -i Dvideo.mp4 -i Daudio.webm -c:v copy -c:a aac output.mp4")
        #video = ffmpeg.input('Dvideo.mp4')
        #audio = ffmpeg.input('Daudio.webm')
        #out = ffmpeg.output(video, audio, r'final.mp4', vcodec='"avc1.640028')
        #out.run()

    except Exception as w:
        print(w)
        notif.config(fg="red",text="There is an Error in the Merge")

#Main Screen
Window = Tk()
Window.title("Youtube Video Downloader ")
#The Labels of Texts 
Label(Window, text="Youtube Video Converter \n By: Mahmoud Ahmed", fg="blue", font=("Calibri",15)).grid(sticky=N,padx=15,row=0)
Label(Window, text="Please enter the url of the Video u want to download it : ", font=("Calibri",12)).grid(sticky=N,row=1,pady=15)
Label(Window, text="Notice Any Downloading will be in the same file with this tool.", fg="orange", font=("Calibri",10)).grid(sticky=N,padx=15,row=8)

#my_progress = ttk.Progressbar(Window,length=130, mode='determinate').grid(row= 9, pady=20)


notif = Label(Window,font=("Calibri",12))
notif.grid(sticky=N,pady=1,row=6)
#Variables
url = StringVar()
#The empty label for URL
Entry(Window,width=50,textvariable=url).grid(sticky=N,row=2)
#The Button
Button(Window,width=20,text="Download",font=("Calibri",12),command=download).grid(sticky=N,row=4,pady=15)
Button(Window,width=20,text="Merge",font=("Calibri",12),command=Merge).grid(sticky=N,row=5,pady=15)
#Button(Window,width=20,text="Info",font=("Calibri",12),command=download).grid(sticky=N,row=4,pady=15)

Window.mainloop()



  


• SVT-AV1 Emscripten build

  24 février 2023, par Yoz

  I am trying to build svt-av1 v1.4.1 for ffmpeg with emscripten 3.1.32. I have followed Build-Guide and ended up with the following command :

  


  cd Build

BUILD_DIR=/home/jozefchutka/ffmpeg-wasm/build/
TOOLCHAIN_FILE=$EMSDK/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake

emmake cmake .. -G"Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$BUILD_DIR -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_FILE -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF -DCMAKE_HAVE_LIBC_PTHREAD=On -DCMAKE_C_FLAGS="-O3 -I/home/jozefchutka/ffmpeg-wasm/build/include -s USE_PTHREADS=1 -msimd128"

emmake make -j


  


  however the process fails on :

  


  ...
[ 95%] Building C object Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/EbTime.c.o
[ 96%] Linking C executable ../../../../Bin/Release/SvtAv1EncApp.js
emcc: error: noexecstack: No such file or directory ("noexecstack" was expected to be an input file, based on the commandline arguments provided)
make[2]: *** [Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/build.make:213: ../Bin/Release/SvtAv1EncApp.js] Error 1
make[1]: *** [CMakeFiles/Makefile2:574: Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....


  


  Generated build.make and link.txt which contains some relevant info.

  


  211: ../Bin/Release/SvtAv1EncApp.js: Source/App/EncApp/CMakeFiles/SvtAv1EncApp.dir/link.txt
212:    @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --green --bold --progress-dir=/home/jozefchutka/ffmpeg-wasm/modules/svtav1/Build/CMakeFiles --progress-num=$(CMAKE_PROGRESS_8) "Linking C executable ../../../../Bin/Release/SvtAv1EncApp.js"
213:    cd /home/jozefchutka/ffmpeg-wasm/modules/svtav1/Build/Source/App/EncApp && $(CMAKE_COMMAND) -E cmake_link_script CMakeFiles/SvtAv1EncApp.dir/link.txt --verbose=$(VERBOSE)


  


  /home/jozefchutka/ffmpeg-wasm/modules/emsdk/upstream/emscripten/emcc -O3 -I/home/jozefchutka/ffmpeg-wasm/build/include -s USE_PTHREADS=1 -msimd128 -O3 -DNDEBUG  -z noexecstack -z relro -z now @CMakeFiles/SvtAv1EncApp.dir/objects1.rsp -o ../../../../Bin/Release/SvtAv1EncApp.js @CMakeFiles/SvtAv1EncApp.dir/linklibs.rsp


  


  As I am not fluent in c/c++ and related build stack, I am not sure if the problem is my build misconfiguration, svt-av1 sources or emscripten.

  


  Please help me resolve the issue or at least identify the cause, so I can continue in relevant issue tracker.

  


• Trimming videos with 'ffmpeg and ffprobe'

  10 août 2022, par adeshina Ibrahim

  I am working on an ETL process, and I'm now in the final stage of preprocessing my videos. I used the script below (reference : @FarisHijazi) to first auto detected black-screen frames using ffprobe and trim them out using ffmpeg.

  


  The script worked for me but the problems are :

  


  


  1. It cut off all other good frames together with the first bad frames. e.g. if gBgBgBgB represents a sequence of good and BAD frames for 5sec each, the script only returned the first g(5sec) and cut off the other BgBgBgB after it. I want to have only g g g g where all B B B B has been removed

     


  


  2. I also want to detect other colors aside black-screen e.g. green-screen or red-screen or blurry part of video

     


  


  3. Script doesn't work if video has no audio in it.

     


  


  


  import argparse
import os
import shlex
import subprocess

parser = argparse.ArgumentParser(
    __doc__, formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
parser.add_argument("input", type=str, help="input video file")
parser.add_argument(
    "--invert",
    action="store_true",
    help="remove nonblack instead of removing black",
)
args = parser.parse_args()

##FIXME: sadly you must chdir so that the ffprobe command will work
os.chdir(os.path.split(args.input)[0])
args.input = os.path.split(args.input)[1]

spl = args.input.split(".")
outpath = (
    ".".join(spl[:-1])
    + "."
    + ("invert" if args.invert else "")
    + "out."
    + spl[-1]
)


def delete_back2back(l):
    from itertools import groupby

    return [x[0] for x in groupby(l)]


def construct_ffmpeg_trim_cmd(timepairs, inpath, outpath):
    cmd = f'ffmpeg -i "{inpath}" -y -r 20 -filter_complex '
    cmd += '"'
    for i, (start, end) in enumerate(timepairs):
        cmd += (
            f"[0:v]trim=start={start}:end={end},setpts=PTS-STARTPTS,format=yuv420p[{i}v]; "
            + f"[0:a]atrim=start={start}:end={end},asetpts=PTS-STARTPTS[{i}a]; "
        )
    for i, (start, end) in enumerate(timepairs):
        cmd += f"[{i}v][{i}a]"
    cmd += f"concat=n={len(timepairs)}:v=1:a=1[outv][outa]"
    cmd += '"'
    cmd += f' -map [outv] -map [outa] "{outpath}"'
    return cmd


def get_blackdetect(inpath, invert=False):
    ffprobe_cmd = f'ffprobe -f lavfi -i "movie={inpath},blackdetect[out0]" -show_entries tags=lavfi.black_start,lavfi.black_end -of default=nw=1 -v quiet'
    print("ffprobe_cmd:", ffprobe_cmd)
    lines = (
        subprocess.check_output(shlex.split(ffprobe_cmd))
        .decode("utf-8")
        .split("\n")
    )
    times = [
        float(x.split("=")[1].strip()) for x in delete_back2back(lines) if x
    ]
    assert len(times), "no black scene detected"

    if not invert:
        times = [0] + times[:-1]
    timepairs = [
        (times[i], times[i + 1]) for i in range(0, len(times) // 2, 2)
    ]
    return timepairs


if __name__ == "__main__":
    timepairs = get_blackdetect(args.input, invert=args.invert)
    cmd = construct_ffmpeg_trim_cmd(timepairs, args.input, outpath)

    print(cmd)
    os.system(cmd)