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• FFMPEG : Encoding settings to meet YouTube recommendation.

  1er novembre 2016, par Dinindu Perera

  So I need to encode to meet these guidelines from YouTube for 480p and 1080p videos. I need help in the settings of FFMPEG. The video should encode reasonably fast.

  These are the guidelines :
  480p 30fps x264
  

  • Video Bitrate : 2560 kbps
  • Audio Bitrate : 384 kbps

  1080p 30fps x264
  

  • Video Bitrate : 8192 kbps
  • Audio Bitrate : 384 kbps

  I’m still learning the ropes with video encoding. Thanks in advance :)

• FFMPEG (Input 8K AAC -> (AAC FLV) youtube streaming noise

  17 septembre 2017, par Biswa Das

  Hello I run a streaming encoder for a non profit cause. Chosen FFMPEG as it’s very simple and doing the job near perfectly however the audio is noisy popping and cracking. Video is crystal clear.

  ffmpeg version N-86950-g1bef008 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.1.0 (GCC)

  Here is my command.

  ffmpeg -rtsp_transport tcp -i $RTSP_SRC -vcodec copy -af "volume=12dB" -ar 8000 -acodec aac -f flv rtmp://a.rtmp.youtube.com/live2/$DEST_KEY

  However when I just play the stream the noise levels are quite acceptable.

  ffplay -rtsp_transport tcp -i $RTSP_SRC

  What I have tried so far.

  • Change input audio sampling from 8K to 16K (that’s all is supported currently). It made the noise problem much worse. I can’t change it to a native FLV sampling(44100 or 22050 or 11025) at least not yet, the integrated rtsp stream does not support it.)
  • My working theory is during resampling stream noise is getting boosted. So to eliminate that I tried audio copy codec even then there is no significant improvement.

• Download ONLY audio from a youtube video

  10 juin 2020, par Feras

  I know that there are a million ways to download a video from youtube and then convert it to audio or do further processing on it. But recently I was surprised to see an app called YoutubeToMp3 on mac actually showing "Skipping X mb of video" and supposedly only downloading the audio from the video, without the need to use bandwith to download the entire video and then convert it. I was wondering if this is actually correct and possible at all because I cant find any way to do that. Do you have any ideas ?

  



  EDIT :
After some tests here is some additional information on the topic. The video which I tried to get the audio from is just a sample mp4 file from the internet :

  



  http://download.wavetlan.com/SVV/Media/HTTP/MP4/ConvertedFiles/MediaCoder/MediaCoder_test6_1m9s_XVID_VBR_306kbps_320x240_25fps_MPEG1Layer3_CBR_320kbps_Stereo_44100Hz.mp4

  



  I tried

  



  ffmpeg -i "input" out.mp3

  



  ffmpeg -i "input" -vn out.mp3

  



  ffmpeg -i “input” -vn -ac 2 -ar 44100 -ab 320k -f mp3 output.mp3

  



  ffmpeg -i “input” -vn -acodec copy output.mp3

  



  Unfortunately non of these commands seems to be using less bandwith. They all download the entire video. Now that you have the video can you confirm if there is actually a command that downloads only the audio stream from it and lowers the bandwith usage ? Thanks !