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• Hide ffmpeg's console window when running YoutubeDL in GUI application

  27 février 2021, par Božo Stojković

  I'm developing a basic application which can download YouTube videos. Throughout the development, I had several quirks, including issues with formats.

  



  I decided to use a hopefully foolproof format syntax that youtube-dl will happily download for me in almost any case.

  



  Part of my YoutubeDL options look like this :

  



  self.ydl_opts = {
    'format': 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best',
    'quiet': True,
    'progress_hooks': [self.ydl_progress],
    'outtmpl': None
}


  



  The outtmpl is inserted later on when output folder is chosen by the user.

  



  Since I'm using this format string, youtube-dl uses ffmpeg to merge(?) the audio and video if they are downloaded separately.

  



  When it does that, it opens very annoying console windows that capture the focus and interrupt other things I might be doing while the videos are downloading.

  



  My question is, how can I prevent ffmpeg or youtube-dl from creating those console windows from appearing, aka. how can I hide them ?

  



  EDIT :

  



  I'll provide bare bones script that reproduces the problem :

  



  from __future__ import unicode_literals
from PyQt4 import QtGui, QtCore
import youtube_dl, sys

def on_progress(info):
    print info.get("_percent_str", "Finished")

ydl_opts = {
    'format': 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best',
    'progress_hooks': [on_progress],
    'quiet': True,
    'outtmpl': "C:/Users/Raketa/Desktop/%(title)s.%(ext)s"
}

ydl = youtube_dl.YoutubeDL(ydl_opts)

class DownloadThread(QtCore.QThread):
    def __init__(self):
        super(DownloadThread, self).__init__()
        self.start()

    def __del__(self):
        self.wait()

    def run(self):
        print "Download start"
        ydl.download(["https://www.youtube.com/watch?v=uy7BiiOI_No"])
        print "Download end"

class Application(QtGui.QMainWindow):
    def __init__(self):
        super(Application, self).__init__()
        self.dl_thread = DownloadThread()

    def run(self):
        self.show()

def main():
    master = QtGui.QApplication(sys.argv)

    app = Application()
    app.run()

    sys.exit(master.exec_())

if __name__ == '__main__':
    main()


  



  2(?) consoles appear at start of each download and 1 longer lasting console appears when both video and audio are downloaded. When downloading longer videos, the last console becomes unbearable.

  



  Is it possible to get rid of those ?

  


• FFmpeg Throwing Up Error After Concat Attempt [closed]

  8 mai 2021, par OrdinaryCarrot16

  I am trying to convert my DVDs using FFmpeg, while doing additional filtering and concatenation. The script I am making is very WIP, but it isn't working at the moment. It throws up the error : "No such filter : ''
Error initializing complex filters.
Invalid argument"

  


  Am I using the correct syntax ?

  


  :: Generate dummy file with blank video & audio streams (for spacing out portions when concating)
ffmpeg -y -f lavfi -i color=size=720x480:color=black:rate=30 -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -c:a aac -c:v libx264 -t 1 spacer_1_tmp.mkv
ffmpeg -y -f lavfi -i color=size=720x480:color=black:rate=30 -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -c:a aac -c:v libx264 -t 2 spacer_2_tmp.mkv

:: Extract intro
ffmpeg -y -avoid_negative_ts make_non_negative -ss 00:00:01 -to 00:00:24.900 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k intro_tmp.mkv

:: Extract title card, episode, and credits
ffmpeg -y -avoid_negative_ts make_non_negative -ss 00:00:25.850 -to 00:00:32.500 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k title_card_tmp.mkv
ffmpeg -avoid_negative_ts make_non_negative -ss 00:00:32.900 -to 00:11:16.950 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k episode_tmp.mkv
ffmpeg -y -avoid_negative_ts make_non_negative -ss 00:11:17.950 -to 00:11:50.900 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k credits_tmp.mkv

:: Merge all extracted components and encode into final video
ffmpeg -i spacer_1_tmp.mkv -i intro_tmp.mkv -i spacer_2_tmp.mkv -i title_card_tmp.mkv -i spacer_2_tmp.mkv -i episode_tmp.mkv -i spacer_2_tmp.mkv -i credits_tmp.mkv -i spacer_1_tmp.mkv -filter_complex "[0:0]setsar=1[v1];[0:1][a1];[1:0]setsar=1[v2];[1:1][a2];[2:0]setsar=1[v3];[2:1][a3];[3:0]setsar=1[v4];[3:1][a4];[4:0]setsar=1[v5];[4:1][a5];[5:0]setsar=1[v6];[5:1][a6];[6:0]setsar=1[v7];[6:1][a7];[7:0]setsar=1[v8];[7:1][a8];[8:0]setsar=1[v9];[8:1][a9];[v1][v2][v3][v4][v5][v6][v7][v8][v9][a1][a2][a3][a4][a5][a6][a7][a8][a9]concat=n=9:v=1:a=1[fv][fa]" -map "[fv]" -map "[fa]" -c:v libx264 -crf 20 -c:a aac -b:a 160k "Slumber Party Panic (S01E02).mp4"

pause


  


• FFmpeg export codec not supported by Samsung

  21 juillet 2021, par Coski

  I am using FFmpeg to render videos (concatenating image files with audio and then applying speed and volume filters) to export videos to upload to TikTok. As a result, I must first move the videos to my phone.

  


  I do not understand why my phone (S20) will happily play one of the videos (codec information pictured first), but presents an error "Codec not supported" when playing the other (information second).

  


  

  


  

  


  The codec information is from VLC, and as you can see, both videos have identical Codecs (H264-MPEG4).

  


  From analysing the information, the only conclusion I come to is that it has something to do with the fact that the "Decoded Format" differs across the videos. How can I change my export command on the latter so my phone supports the codec ?

  


  CONCATENATION CODE
ffmpeg -f concat -safe 0 -i {path_temp}\\clips.txt -c copy -y "{path_temp}\\{title}_a.mp4

  


  FILTER CODE
ffmpeg -i input.mp4 -filter:a "volume={volume}" -y temp.mp4"

  


  SECOND FILTER
ffmpeg -i temp.mp4 -filter_complex "[0:v]setpts={1/speed}*PTS[v];[0:a]atempo={speed}[a]" -map "[v]" -map "[a]" -y output.mp4