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• Creating video from audio and resized image using FFMPEG

  26 septembre 2018, par nemeskeriors

  Im trying to create an mp4 video from an mp3 and an image with ffmpeg. The video should be the size of 640x360 with black background and the image should be resized to fit in this dimensions and centred in the middle. The video’s length must match the mp3’s length.

  Its basically a video creation for youtube from a song and an artwork.

  For now i was able to achieve this with 3 steps :

  1. resize image :

  -i %image% -vf scale='if(gt(a,4/3),640,-1)':'if(gt(a,4/3),-1,360)' %resized_image%

  2. create a music video with black background :

  -f lavfi -i color=s=640x360 -i %audio_file% -c:v libx264 -s:v 640x360 -c:a aac -strict experimental -b:a 320k -shortest -pix_fmt yuv420p %video%

  3. put the resized image centred in the video :

  -i %video% -i %resized_image% -filter_complex "overlay=(W-w)/2:(H-h)/2" -codec:a copy %final_video%

  Is it possible to achieve all this with one ffmpeg command ?

• FFMpeg : Convert image + audio to MP4 60FPS including FadeIn / FadeOut and overlay

  6 juillet 2022, par Dev01

  Here is what I'm trying to achieve :

  


  

  1. Inputs are an MP3 or WAV, and an image (JPG or PNG)

  


  2. The output should be an MP4 video with the MP3 audio with the image, at 60FPS for a very smooth fade in/fade out (black) on the video (1s each)

  


  


  I strugguling to make this fade in / fade out.
Here is what I have :

  


   ffmpeg -r 1 -loop 1 -i image.jpg -i audio.mp3 -acodec copy -r 60 -shortest -vf fade=in:0:01 -pix_fmt yuv420p output.mp4


  


  My fadein is static, so black image and then my video, not smooth.
How do I get a smooth 60FPS fade ?

  


  I also have another request, let's say I have an overlay video that I want to concatenate to my video. If I concatenate a video to the existing video, the overlay will also be on top of the fades which is not right, how can I achieve this ? Thank you so much.

  


• Using ffmpeg to stream to Facebook Live Video : can preview, but not go live

  17 novembre 2016, par Einar Magnússon

  I am trying to stream a webpage to Facebook Live video using ffmpeg. I know I can use OBS, but I’m trying to do it from a server, so I can’t go with OBS. It works fine when I’m previewing, but as soon as I press ’Go live’, at first it seems like it’s starting, but then when it takes me to the live view it just says that the video has ended. I even checked the error of the video log using Graph API, nothing. I’m using PhantomJS to pipe screenshots to ffmpeg :

  phantomjs phantom.js | ffmpeg -y -c:v mjpeg \
  
  -f image2pipe \
  
  -r 5 -i \
  
  - -c:v libx264 \
  
  -x264-params keyint=5 \
  
  -b:v 1000k -minrate 1000k -maxrate 1000k -bufsize 500k \
  
  -f flv 'rtmp://rtmp-api.facebook.com:80/rtmp/xxxxxxxxxxxxxxxx'

  As I said, it’s working fine in the preview of the live stream on Facebook, but just ends immediately when I go live. I added the bitrate options to try to keep a constant bitrate as mandated by Facebook (https://developers.facebook.com/docs/videos/live-video/production-broadcasts), and I have a keyframe every 5 frames (rather low frame rate at 5fps) so that requirement is fulfilled as well.

  I’m not sending any audio, could that cause a problem ?