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• FFmpeg : Adding multiple overlays to the video with the fade in/out effect. Command works but the images ( overlays ) doesn't show in the video

  12 décembre 2019, par ArmKh

  I’m trying to add multiple overlays to the video and fade in/out them separately. So, the command works without any issue but in the video, I can’t see the overlay images

  Here is the command with which I’m trying to do it

  ffmpeg -y -i video.mp4 -loop 1 -i text1.png -loop 1 -i text2.png -loop 1 -i text3.png -loop 1 -i text4.png -loop 1 -i text5.png -filter_complex "
  
  [1]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+5/TB[ovr1];
  
  [2]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+10/TB[ovr2];
  
  [3]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+15/TB[ovr3];
  
  [4]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+20/TB[ovr4];
  
  [5]fade=st=0:d=4:alpha=1,fade=out:st=2:d=1:alpha=1,trim=0:3,setpts=PTS+25/TB[ovr5];
  
  [0:v][ovr1]overlay=0:0:enable='between(t,0,5)'[base1];
  
  [base1][ovr2]overlay=0:(main_h-overlay_h)/2:enable='between(t,5,10)'[base2];
  
  [base2][ovr3]overlay=0:(main_h-overlay_h)/2:enable='between(t,10,15)'[base3];
  
  [base3][ovr4]overlay=0:(main_h-overlay_h)/2:enable='between(t,15,20)'[base4];
  
  [base4][ovr5]overlay=0:(main_h-overlay_h)/2:enable='between(t,20,25)'[out]" -map "[out]" -c:v libx264 -c:a copy -flags +global_header -shortest with_overlays.mp4

  Can you please help me to find what am I doing wrong ?

• Why Do Some of the Codecs in FFMPEG's Supported Codec List Show "encoders :" or "decoders :" in Parenthesis ?

  4 mai 2020, par spaceman

  If you open the Command Prompt, and run ffmpeg -codecs,
  
you will get a long list of Codecs that FFMPEG supports.

  



  Here's a small sample of the list :

  



   DEV.L. h261                 H.261
 DEV.L. h263                 H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
 D.V.L. h263i                Intel H.263
 DEV.L. h263p                H.263+ / H.263-1998 / H.263 version 2
 DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)
 D.V.LS hevc                 H.265 / HEVC


  



  Now If you briefly go over the whole list,
  
you see that most Codecs in this list appear with their Name and Description,
  
but some of the Codecs also include parenthesis in the Description, and in the parenthesis,
  
they specify "encoders :" or "decoders :".

  



  For example :

  



  1)

  



   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)


  



  2)

  



   DEVILS jpeg2000             JPEG 2000 (decoders: jpeg2000 libopenjpeg) (encoders: jpeg2000 libopenjpeg)


  



  3)

  



   DEV.L. msmpeg4v3            MPEG-4 part 2 Microsoft variant version 3 (decoders: msmpeg4) (encoders: msmpeg4)


  



  4)

  



   DEA.L. aac                  AAC (Advanced Audio Coding) (encoders: aac libvo_aacenc)


  



  5)

  



   DEA.L. amr_nb               AMR-NB (Adaptive Multi-Rate NarrowBand) (decoders: amrnb libopencore_amrnb) (encoders: libopencore_amrnb)
 DEA.L. amr_wb               AMR-WB (Adaptive Multi-Rate WideBand) (decoders: amrwb libopencore_amrwb) (encoders: libvo_amrwbenc)


  



  My question :

  



  Why do some Codecs have those parenthesis, specifying Encoders/Decoders,
  
while other (in fact : most) codecs don't have these parenthesis ?

  


• Winamp Media Player Released with WebM Support

  21 juillet 2010, par noreply@blogger.com (John Luther)

  Winamp Media Player now supports native WebM playback. Read all about it on their blog.