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• ffmpeg convert one png to DNxHD

  15 mars 2019, par bcvery1

  I’m trying to create a DNxHD file from one PNG file. The output should be "24000/1001" fps, 1920x1080, using the dnxhd codec. Every frame should be the same. The outputted stream must be 20 seconds in length.

  I have a solution which uses filter_complex to loop the PNG for each frame, however this results in extremely large files. Given that I will be combining possibly multiple hundred DNxHD files into one AAF file, the output file size is too large.

  Is there any improvement I can make on the command below which would achieve this file size reduction ?

  ffmpeg -i INFILE.png -y -nostdin -an -vcodec dnxhd -pix_fmt yuv422p -vb 36M  -framerate 24000/1001 -filter_complex loop=479:1:0 OUFILE.dnxhd

  I do not know ffmpeg all that well, this command has been constructed by copying parts of commands I have found online.

• FFMPEG live transcoder aac_latm audio crash

  15 mars 2013, par user1716057

  i am trying to use ffmpeg as a live transcoder to transcode tv channels from udp input to rtmp output to a wowza server.

  i have 2 kinds of input channels in 1st kind the input audio is mp2 and in the second kind the input audio is acc_latm.

  my problem is when i transcode the mp2 channels everything is fine but when i try to transcode the aac channel the audio is muted after few hours. but the video is fine.

  the output codecs are : libx264 for video and faac or fdk-aac for audio output
  i tried both aac encoders but it did not change.

  i think it is the ffmpeg aac decoder's problem. but i cannot fix this.

  i need a way to detect the problem online and restart the ffmpeg. or change the ffmpeg decoder codec.

  please help.
  thanks.

• discord.py FFMPEG Option reconnect not found

  19 avril 2021, par Lukelele

  I'm working on a music bot using discord.py, I've looked online and found that I needed to pass in ffmpeg options into discord.FFmpegPCMAudio() for the bot to not stop half way through the song. However it returns an error "Option reconnect not found."

  


  vc = await ctx.message.author.voice.channel.connect()

ydl_opts = {
    'format': 'bestaudio/best',
    'outtmpl': 'C:/Luke/YoutubeDLAudio/audio.mp3',
    'postprocessors': [{
        'key': 'FFmpegExtractAudio',
        'preferredcodec': 'mp3',
        'preferredquality': '192'
    }],
    'prefer_ffmpeg': True,
    'keepvideo': True
}

ffmpeg_opts = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5','options': '-vn'}   # <---------------

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download([url])

vc.play(discord.FFmpegPCMAudio(executable="C:/Luke/ffmpeg/bin/ffmpeg.exe", source="C:/Luke/YoutubeDLAudio/audio.mp3", **ffmpeg_opts))    <--------------


  


  Does anyone know the problem ? Thanks for any help.