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• how to copy mp4 file generated by FFMPEG spawn using another FFMPEG spawn

  2 mai 2021, par Abadi

  I am using the following code that records screen on Linux and the output is an mp4 file.

  


  const transcodeStreamToOutput = spawn('ffmpeg',[
'-hide_banner',
'-loglevel', 'error',
// disable interaction via stdin
'-nostdin',
// screen image size
'-s', `${BROWSER_SCREEN_WIDTH}x${BROWSER_SCREEN_HEIGHT}`,
// video frame rate
'-r', `${VIDEO_FRAMERATE}`,
// hides the mouse cursor from the resulting video
'-draw_mouse', '0',
// grab the x11 display as video input
'-f', 'x11grab',
    '-i', `${DISPLAY}`,
// grab pulse as audio input
'-f', 'pulse',
    '-ac', '2',
    '-i', 'default',
// codec video with libx264
'-c:v', 'libx264',
    '-pix_fmt', 'yuv420p',
    '-profile:v', 'main',
    '-preset', 'veryfast',
    '-x264opts', 'nal-hrd=cbr:no-scenecut',
    '-minrate', `${VIDEO_BITRATE}`,
    '-maxrate', `${VIDEO_BITRATE}`,
    '-g', `${VIDEO_GOP}`,
// apply a fixed delay to the audio stream in order to synchronize it with the video stream
'-filter_complex', 'adelay=delays=1000|1000',
// codec audio with aac
'-c:a', 'aac',
    '-b:a', `${AUDIO_BITRATE}`,
    '-ac', `${AUDIO_CHANNELS}`,
    '-ar', `${AUDIO_SAMPLERATE}`,
// adjust fragmentation to prevent seeking(resolve issue: muxer does not support non seekable output)
'-movflags', 'frag_keyframe+empty_moov',
// set output format to mp4 and output file to stdout
'-f', 'mp4', '-'
]


  


  ) ;

  


  I need to run ffmpeg -i captured.mp4 -c copy new.mp4 using another spawn process on the output.
I tried the following :

  


  const newStdOut =  spawn('ffmpeg',[

    '-i', `${transcodeStreamToOutput.stdout}`, 
    '-codec:v', 'copy', 
    '-codec:a', 'copy', 
    '-f', 'mp4', '-'
    ]
);


  


  But it is not working. I would appreciate any help.

  


• Python script and equivalent command do not run the same

  19 août 2021, par user32882

  I would like to use youtubedl to download the audio from a YouTube video into an mp3 file. I came up with the following command to do so :

  


  youtube-dl -x --audio-format mp3 https://www.youtube.com/watch?v=SF8DGbfOFig&ab_channel=derang

  


  When I run the above command through my command line, it seems that I successfully manage to download the file in mp3 format :

  


  [youtube] SF8DGbfOFig: Downloading webpage
[download] Destination: Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k]-SF8DGbfOFig.webm
[download] 100% of 5.57MiB in 00:03
[ffmpeg] Destination: Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k]-SF8DGbfOFig.mp3
Deleting original file Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k]-SF8DGbfOFig.webm (pass -k to keep)


  


  I then tried to convert the above command to an equivalent python script as follows :

  


  import youtube_dl
links = ["https://www.youtube.com/watch?v=SF8DGbfOFig&ab_channel=derang"]
ydl_args = {
        'audioformat': 'mp3',
        'outtmpl': '%(title)s.%(ext)s',
        'extractaudio': True
    }
with youtube_dl.YoutubeDL(ydl_args) as ydl:
    results = ydl.download(links)


  


  However, this does not succeed in generating an mp3 file of the audio. These are the logs I am getting :

  


  WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[download] Destination: Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k].f135.mp4
[download] 100% of 4.42MiB in 00:02
[download] Destination: Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k].f251.webm
[download] 100% of 5.57MiB in 00:03
[ffmpeg] Merging formats into "Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k].mkv"
Deleting original file Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k].f135.mp4 (pass -k to keep)
Deleting original file Total Science & S.P.Y - Piano Funk (Ft. Riya & DāM FunK) [320k].f251.webm (pass -k to keep)


  


  What am I doing wrong here ? Aren't my command and python script equivalent ?

  


• Android Get only Audio Stream of Online Video ?

  19 avril 2014, par user1575044

  I am beginner in Android, basically I want to get only audio stream of an online streaming video, so that I don't have to download video just download audio part of video only as an mp3 file(saving lot of data if you only need it as an mp3 file). I researched and got to know it can be done maybe using ffmpeg. Can someone guide me in this, some tutorials links or sample code would be beneficial.

  Thank You !!