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• FFmpeg more than 1000 frames duplicated and input height doesn't match

  2 septembre 2021, par Karine

  I'm currently using this code to record two windows side by side :

  


  ffmpeg -f gdigrab -framerate 30 -i title="" -f gdigrab -framerate 30 -i title="" -c:v h264_nvenc -qp 0 -filter_complex hstack=inputs=2 2.mp4


  


  However it throw this error after execution :

  


  More than 1000 frames duplicated


  


  Error Log : https://pastebin.com/gREVrKVK

  


  The first window mostly time is the same frame, maybe 1 frame change in each 3 sec.

  


  Another error in console is when the first window have a different height than second window, error :

  


  [Parsed_hstack_0 @ 000002491166fd00] Input 1 height 500 does not match input 0 height 488.
[Parsed_hstack_0 @ 000002491166fd00] Failed to configure output pad on Parsed_hstack_0


  


  Error log : https://pastebin.com/vqdBPfpv

  


  Looks like is not possible to record when they have different dimensions, so, if possible I would like to ask how to scale the first window to the same height (doesn't need to keep aspect ratio) of the second window, considering low CPU use above the video quality.

  


• movenc : add movie_timescale option instead of hardcoding 1000

  27 avril 2021, par Justin Ruggles

  movenc : add movie_timescale option instead of hardcoding 1000
  There are cases where using 1000 as the MP4 timescale is not
  
  accurate enough, for example when one needs sample-accurate audio
  
  handling.
  This adds a new AVOption to the MOV/MP4 muxer to override the
  
  movie timescale, but it still defaults to 1000 to maintain current
  
  default behavior.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DH] libavformat/movenc.c
  • [DH] libavformat/movenc.h
  • [DH] libavformat/version.h

• ffmpeg error : Unable to find a suitable output format for 'scale=1500:1000'

  13 février 2021, par Tomáš Zato - Reinstate Monica

  I am trying to convert a bunch of images into a video. The original image resolution is 6000x4000, but if I use ffmpeg to create a video with that resolution, no player can even play it because it's way to huge.

  


  I tried to set the output resolution as such, dividing the input resolution by 4 :

  


  ffmpeg -r 60 -s 1500x1000 -start_number 3790 -i DSC_%04d.jpg -vcodec libx264 -crf 25  -pix_fmt yuv420p ../video_lowres.mp4


  


  This had no effect and still produced 6000x4000 video. So instead, I tried this parameter : scale=1500:1000 The full command I ran :

  


  ffmpeg -r 60 scale=1500:1000 -start_number 3790 -i DSC_%04d.jpg -vcodec libx264 -crf 25  -pix_fmt yuv420p ../video_lowres.mp4


  


  But I got this error :

  


  [NULL @ 000002ad897bd9c0] Unable to find a suitable output format for 'scale=1500:1000'
scale=1500:1000: Invalid argument


  


  How can I create a downscaled video from photos using ffmpeg ?