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• What is num_ref_idx_l0_active_minus1 ?

  9 février 2017, par Victor.dMdB

  I'm encoding an h264 file and the ouput PPS contains num_ref_idx_l0_active_minus1=3, but I need this to be 0 instead.

  In the ITU-T H.264 spec, it states :

  num_ref_idx_l0_active_minus1 specifies the maximum reference index for reference picture list 0 that shall be used to decode the slice.

  But the closest option I can find in libx264 is -refs, but that doesn't seem to affect it.

  I understand that since this is referring to List 0, it is associated with B-Frames, but there are no specific libx264 parameters relevant to that specific field.

• c# ffmpeg editor, can you help me ? please [on hold]

  9 février 2017, par John Work

  Would you tell C # Ffmpeg how to edit the video and how to add the time? can you help me?

• Time interval between frames ffmpeg while creating thumnail

  9 février 2017, par rohit phogat

  I am creating a thumbnail sheet from videos inside a folder with 7 rows and 3 columns. I am using following command

  ffmpeg  -i "video.mp4" "ss.jpg" -frames 1 -q:v 1 -vf "select=not(mod(n\,40)),scale=466:-1,tile=3x7" 
  

  I am not getting desired output. It just create thumnail starting from 00:00:00 and finishes at like 00:01:00

  How can i get time interval of 60 seconds between each frame?

• How to reduce time while compressing video without affecting quality by using ffmpeg ?

  9 février 2017, par Rajshekhar Yadav

  This is my command of compressing video.

  -y -i +input+
   -s videoscreensize -r 30 -vf transpose=1 -c:v libx264 -preset ultrafast -c:a copy -me_method zero -tune fastdecode -tune zerolatency -strict -2 -b:v 2048k+ output 
  

• Repeat input audios while mixing

  9 février 2017, par Vishnu

  I have Two audio , short1.mp3 and short2.mp3

  I want to loop short1.mp3 for 100 times and also loop shor2.mp3 until duration of short1.mp3(100 times looped) .How can I do it , Below is the Code I tried

  ffmpeg -i short1.mp3 -filter_complex "amovie=short2.mp3:loop=100[s];[0][s]amix=duration=shortest" final.mp3