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• ffmpeg droping session when there is no input , need to wait for an input

  25 mars 2019, par Hovo

  I am trying to live stream to facebook from an application, which is writing frames into image sequence of XXX_Frame.jpg inside a folder.

  I am using a ffmpeg with these commands

  ffmpeg -y -r 15 -f image2 -start_number 0 -i "%0d_Frame.jpg" -i "test.mp3" -muxdelay 1 -preset slow -flush_packets 1 -ar 44100 -b:a 128k -profile:v baseline -acodec aac -vf scale=1280x720 -vcodec libx264 -crf 15 -r 50 -pix_fmt yuvj420p -minrate 50k -maxrate 150k -bufsize 8192k -g 1 -b:v 1200 -f flv "rtmp ://live-api-s.facebook.com:80/rtmp/xxxxxx"

  It is starting to stream faster than 15 frames per second and whenever it finishes up streaming of the available frames it is killing the process and returning error.
  It would be perfect if it was possible to slow down the mux’s read from the input to frame rate speed.

  [flv @ 000001f34347cf00] Failed to update header with correct duration.
  [flv @ 000001f34347cf00] Failed to update header with correct filesize.
  Error writing trailer of rtmp ://live-api-s.facebook.com:80/rtmp/xxxxxx : Error number -10053 occurred

  Any help would be appreciated.

  Expected result is to stream continuously without losing the connection , even sending the last available image continuously.

• How do I compile a c++ repository with multiple libraries [on hold]

  12 septembre 2017, par Firat Oezcan

  before someone comes and tells me that I should just google stuff first. I did. I didn’t really found anything that suits my needs and also asked my colleagues and other graduates and no one really could help me out.

  It is about this repository specifically : https://github.com/facebook/transform360

  Yes, there are literal instructions on how to do it but they are, honestly, too vague for me. I know that sounds really weird but I guess I’m just spoiled by Unity3D and other IDEs that did most of it for me.

  I don’t understand what is meant with :
  Build .cpp and .h files in Transform360, together with openCV, as a library, where these files are dependent on openCV
  and this line
  Add the Transform360 library file to the extra-libs of ffmpeg.

  I would love if anyone could help me out or better, explain to me how something of this kind is done correctly so I don’t have to ask again. Or really, just point me to information that already exists.
  Thanks in advance

• QuickTime plays separate audio tracks all at once with ffmpeg generated file

  23 mai 2022, par Justin Smith

  Let's say I have four files :

  


  

  • video.mp4

  


  • english.mp4

  


  • french.mp4

  


  • spanish.mp4

  


  


  I'm using the following ffmpeg command to create a single video file with multiple audio tracks for each language :

  


  ffmpeg -i video.mp4 -i english.mp4 -i spanish.mp4 -i french.mp4 \
-map 0:v -map 1:a -map 2:a -map 3:a \
-metadata:s:a:0 language=eng -metadata:s:a:0 title="English" \
-metadata:s:a:1 language=spa -metadata:s:a:1 title="Spanish" \
-metadata:s:a:2 language=fra -metadata:s:a:2 title="French" \
-disposition:a:0 default \
-c:v copy -c:a aac output.mp4


  


  The resulting video file output.mp4 works fine in VLC, but the audio tracks play all at once in QuickTime and the separate audio channels don't appear in the Languages menu. What am I doing wrong here ?