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• Combining zoompan slideshow with watermark overlay in FFMPEG

  2 avril 2020, par ricky_bobby43

  I've created a slideshow from a series of images with this

  



  ffmpeg -i img%d.jpg -vf zoompan=d=(7+1)/1:s=6144x3072:fps=1,framerate=25:interp_start=0:interp_end=255:scene=100 -c:v mpeg4 -q:v 2 out.mp4


  



  I have a semi-transparent watermark (inx.png) that I am applying for the first 3 seconds, but currenly using a separate command in FFMPEG :

  



  ffmpeg -i 6144out.mp4 -loop 1 -i inx.png -filter_complex "[1:v]format=argb,geq=r='r(X,Y)':a='0.5*alpha(X,Y)'[foo]; [foo]fade=out:st=3:d=1:alpha=1[bar], [0:v][bar]overlay" -vcodec libx264 output2.mp4


  



  Is there a way to combine the two ?

  


• mlp_parser : Drop in-parser downmix functionality

  26 avril 2017, par Vittorio Giovara

  mlp_parser : Drop in-parser downmix functionality
  request_channel_layout is a decoder option and it makes no sense
  
  to have it in a parser.
  This feature was needed in the past when the decoder was allowed
  
  to reuse the avctx from the demuxer. Nowadays the decoder receives
  
  only the parameters from it, already containing the real channel
  
  layout (and the correct request_channel_layout option).
  After initialization the decoder overwrites the channel layout
  
  with the downmixed one that is actually output, so there is no need
  
  to preserve this functionality in the parser.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavcodec/mlp_parser.c
  • [DBH] libavcodec/mlp_parser.h
  • [DBH] libavcodec/mlpdec.c

• Combining 2 FFMPEG Commands

  11 juillet 2020, par John Doe

  I'm trying to combine 2 ffmpeg commands, one which creates the video, and another which adds a simple fade to the beginning of the created video. Here's what I have :

  


  ffmpeg -y -stream_loop -1 -i "video.mp4" -stream_loop -1 -i "music.mp3" -i "audio.mp3" -filter_complex "[1:a]volume=0.1[a1];[2:a]adelay=5000|5000,apad=pad_dur=10[a2];[a1][a2]amerge=inputs=2,afade=in:st=0:d=5[audio]" -map "0:v" -map "[audio]" -c:v libx264 -c:a aac -ac 2 -ar 22050 -preset veryfast -shortest "output.mp4"

ffmpeg -y -i "output.mp4" -filter_complex "[0:v]fade=in:0:d=5" -c:a copy -preset veryfast -movflags faststart -fflags genpts "done.mp4"


  


  The two commands work perfectly fine, however the second one takes about the same amount of time to process as the first, and I feel it should be relatively easy to do the fade-in during the first encode. For my skillset atleast, I was wrong. Please could someone with more experience lend a helping hand ?

  


  Thanks.