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• FFMPEG YouTube Live Too Fast

  6 avril 2017, par Liam Martens

  So I am streaming video and audio to YouTube as follows

  THE CONTEXT

  1. First I convert a graphic GIF to an MP4 file

  ffmpeg -f gif -i graphic.gif -c:v libx264 -pix_fmt yuv420p -vf scale=1280:-1 temp.mp4

  2. Then I overlay a PNG with text over the MP4

  ffmpeg -i temp.mp4 -i overlay.png -filter_complex "overlay=10:10" '.$graphicsPath.'/graphic.mp4

  3. Then I start the stream the video and combine it with audio using following code (sources.txt is just a concat list *)

  ffmpeg -f concat -i sources.txt -i music.mp3 \
  
      -c:v libx264 -c:a aac -shortest -deinterlace \
  
      -pix_fmt yuv420p -preset '.$encoding.' -r 30 -g 60 -b:v 2500k \
  
      -acodec libmp3lame -ar 44100 -threads 6 -qscale 3 -b:a 712000 \
  
      -maxrate 800k -bufsize 1400k \
  
      -f flv rtmp://a.rtmp.youtube.com/live2/KEY

  4. After the stream ends, the code starts over again with a new song to mimic a 247 stream.

  THE ISSUE

  So the issue I am having is that it appears to be streaming too fast. It’s like the opposite of buffering issues where the buffer is way too long (as in a full song buffered by the time the first one has finished if you open the stream)

  Does anyone know how I could throttle the output ? I have tried with maxrate and bufsize but no real result.

  * sources.txt example
  file ’graphic.mp4’
  file ’graphic.mp4’
  file ’graphic.mp4’
  file ’graphic.mp4’
  file ’graphic.mp4’
  file ’graphic.mp4’
  and so on

• Batch File : How can I make input videos to be sequentially named in same loop

  2 décembre 2022, par Ionut Bejinariu

  I end up with the code in this form.

  


  the first ffmpeg .. its working alone but not inside the second For 
that's why I made a second one, also I did this because I need to increment the Videos-*
to be be Videos-1.mp4, Videos-2.mp4 ... Videos-99.mp4 , all the videos are in %videodir% named like this.

  


  I tried also "%videodir%\Videos-%d.mp4" also "%videodir%\*.mp4" for videos to be sequentially named loop after loop, but not worked for me.

  


  @echo off
setlocal enabledelayedexpansion
 
set "musicdir=F:\MONTAJ VIDEO\video-simplu\MUZICA-wav-mp3"  
set "videodir=F:\LUCRU-VIDEO\primele-15sec"  
set "exportdir=E:\Export-yt-shorts

for /l %%c in (1,1,2200) Do (
 
  ffmpeg -i "%videodir%\Videos-%%c.mp4" -i "%videodir%\Videos-%%c.mp4" -filter_complex "[0:v]scale=3413:1920,boxblur=4[bg];[1:v]scale=1080:-1[fg];[bg][fg]overlay=(W-w)/2:(H-h)/2[tmp];[tmp]crop=1080:1920:(3413-1080)/2:0[out]" -map [out] -map 0:a output01.mp4
 
)

    for %%A in ("%musicdir%\*") DO (
   ffmpeg -i output01.mp4 -i "%%A" -map 0:v -map 1:a -vcodec copy -c:a aac -b:a 320k -shortest "%exportdir%\%%~nA.mp4"
    del output01.mp4
 )




  


  Can anyone help me on this ? Thank you
Later Edit :
I want to explain the logic I thought about the two FOR

  


  I have two folders.
— 1 folders with mp4 videos wide ratio 16/9 Full HD

  


  are named like this ---> Videos-1.mp4, Videos-2.mp4 .. Videos-3.mp4 ... Videos-2200.mp4

  


  and 1 folder with music mp3 and wav's

  


  in first for its first mp4 export that I want to combine with first song from the second for then second video with second song from folder. etc

  


  in the end I want to have 9/16 ratio video

  


• How to create/repair the XingHeader for total stream size using taglib or other tools ?

  6 novembre 2012, par user784637

  I downloaded a video from youtube whose audio was encoded in aac and then I transcoded it to an mp3 using the libmp3lame codec.

  $ ffmpeg -i video.mp4 -vn -acodec libmp3lame -ab 128K -- cold.mp3

  Now when I try to write id3 tags to it using the taglib example tagwriter I get the following warning :

  $ ./testwriter -t 'stuff' cold.mp3
  
  TagLib: MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size.

  The id3 tags are written and display correctly, but the lack of well formed XingHeaders causes older mp3 players to loop the song several times or even crash (I don't know why, this song has been encoded as cbr not vbr.) In windows 7 the Bit rate displays as 0kbps.
  

  How do I create a wellformed XingHeader for total stream size using taglib or other tools that can be executed from the commandline ?

  Here's some documentation for xingheaders on taglib

  http://taglib.github.com/api/classTagLib_1_1MPEG_1_1XingHeader.html#ac0ba25f2922757c4bdd2851fdc2ccdde

  http://taglib.github.com/api/xingheader_8h_source.html