Recherche avancée

Sur d’autres sites (3182)

• ffmpeg error : "Missing ')' or too many args in 'if(gt(a,1),650,-1)'"

  23 février 2015, par Remini me

  I am trying to run this ffmpeg command in linux shell, to scale down the video (if portrait, than to maximum height of 650, while adjusting the width. And if landscape, then 650 maximum width, and adjust the height with aspect ratio) :

  ffmpeg -i 1.mp4 -r 30 -vf scale="'if(gt(a,1),650,-1)':'if(gt(a,1),-1,650)'" -vcodec libx264 output_file1.mp4

  But I get the following error :

  [scale @ 0x1d48a40] [Eval @ 0x7fff53a49340] Missing ’)’ or too many
  args in ’if(gt(a,1),650,-1)’ [scale @ 0x1d48a40] [Eval @
  0x7fff53a49340] Missing ’)’ or too many args in ’if(gt(a,1),-1,650)’
  Error when evaluating the expression ’if(gt(a,1),-1,650)’

  **EDIT : I have tried using the new @slhck syntax :

  -vf "scale=if(gt(a\,1)\,650\,-2):if(gt(a\,1)\,-2\,650)"

  The result I got was :

  ffmpeg version 0.8.16-4:0.8.16-0ubuntu0.12.04.1, Copyright (c)
  2000-2014 the Libav developers built on Sep 16 2014 18:33:49 with
  gcc 4.6.3 The ffmpeg program is only provided for script compatibility
  and will be removed in a future release. It has been deprecated in the
  Libav project to allow for incompatible command line syntax
  improvements in its replacement called avconv (see Changelog for
  details). Please use avconv instead.

  Seems stream 0 codec frame rate differs from container frame rate :
  180000.00 (180000/1) -> 90000.00 (180000/2) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’1.mp4’ : Metadata :
  major_brand : isom
  minor_version : 0
  compatible_brands : isom3gp4
  creation_time : 2015-02-05 14:54:24 Duration : 00:00:45.30, start : 0.000000, bitrate : 17058 kb/s
  Stream #0.0(eng) : Video : h264 (High), yuv420p, 1920x1080, 17021 kb/s, 30.01 fps, 90k tbr, 90k tbn, 180k tbc
  Metadata :
  creation_time : 2015-02-05 14:54:24
  Stream #0.1(eng) : Audio : aac, 48000 Hz, stereo, s16, 124 kb/s
  Metadata :
  creation_time : 2015-02-05 14:54:24 File ’output_file1.mp4’ already exists. Overwrite ? [y/N] y

  [buffer @ 0x747ec0] w:1920 h:1080 pixfmt:yuv420p [scale @ 0x745a40] [Eval @ 0x7fffac94b220] Missing ’)’ or too many args in
  ’if(gt(a,1),650,-2)’ [scale @ 0x745a40] [Eval @ 0x7fffac94b220]
  Missing ’)’ or too many args in ’if(gt(a,1),-2,650)’ Error when
  evaluating the expression ’if(gt(a,1),-2,650)’ Error opening
  filters !

  What should I do ?

• Not able to pipe gstreamer output into ffmpeg

  31 janvier 2015, par Henry Soang

  has anybody gotten gstreamer to successfully pipe it’s video output into ffmpeg ?

  I’ve tried playing with /dev/stdout and I keep getting errors :

  gst-launch -e v4l2src device=/dev/video0 ! ’video/x-raw-yuv,width=1920,height=1080,framerate=5/1’ ! nv_omx_h264enc quality-level=2 ! mp4mux ! filesink location=/dev/stdout \
  | ffmpeg -y -i - -codec copy -f flv test.flv

  ...
  [aac @ 0xebc4c0] Could not find codec parameters for stream 0 (Audio : aac (Main), 7.1, fltp, 1351 kb/s) : unspecified sample rate
  Consider increasing the value for the ’analyzeduration’ and ’probesize’ options
  pipe: : could not find codec parameters
  Input #0, aac, from ’pipe :’ :
  Duration : N/A, bitrate : 1351 kb/s
  Stream #0:0 : Audio : aac (Main), 7.1, fltp, 1351 kb/s
  [flv @ 0xec9280] sample rate not set
  Output #0, flv, to ’test.flv’ :
  Stream #0:0 : Audio : aac, 7.1, 1351 kb/s
  Stream mapping :
  Stream #0:0 -> #0:0 (copy)
  Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument
  ubuntu@tegra-ubuntu : $

  Running the commands separately (replacing /dev/stdout with a file) works fine.

  If you got it to work and can share how you did it, that would be great.

  Thanks.

• Problems accessing codecs with ggplot and gganimate

  19 décembre 2016, par noLongerRandom

  Using gganimate. Can’t figure out how to properly access functionality of ffmpeg, specifically I want to change the codec I’m using in the video file I’m outputting.

  # load packages
  
  library(ggplot)
  
  library(animation)
  
  library(gganimate)
  
  
  
  # Here's my data.frame
  
  myDf <- data.frame(
  
      year = c(1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014), 
  
      bottom50 = c(0.195, 0.191, 0.187, 0.192, 0.196, 0.205, 0.207, 0.210, 0.209, 0.204, 0.203, 0.204, 0.205, 0.203, 0.202, 0.200, 0.200, 0.201, 0.199, 0.195, 0.190, 0.183, 0.179, 0.179, 0.177, 0.172, 0.169, 0.169, 0.168, 0.166, 0.158, 0.159, 0.158, 0.154, 0.151, 0.148, 0.149, 0.148, 0.146, 0.149, 0.148, 0.145, 0.142, 0.138, 0.135, 0.137, 0.137, 0.136, 0.130, 0.127, 0.123, 0.127, 0.125), top1 = c(0.126, 0.127, 0.129, 0.128, 0.126, 0.123, 0.122, 0.115, 0.110, 0.111, 0.111, 0.109, 0.106, 0.105, 0.105, 0.107, 0.108, 0.111, 0.107, 0.110, 0.112, 0.115, 0.125, 0.125, 0.122, 0.133, 0.149, 0.145, 0.145, 0.139, 0.150, 0.146, 0.147, 0.153, 0.160, 0.166, 0.169, 0.177, 0.183, 0.173, 0.171, 0.172, 0.183, 0.194, 0.201, 0.199, 0.195, 0.185, 0.198, 0.196, 0.208, 0.196, 0.202)
  
  )
  
  
  
  #Basic plot
  
  p <- ggplot(myDf, aes(x = year, y = bottom50, frame = year)) + 
  
      geom_line(color = "dodgerblue") + 
  
      geom_line(aes(y = top1), color = "darkred")

  The non-animated version gets me what I want :

  

  And I get an animation version output to video with :

  gganimate(p, interval = .1, title_frame = FALSE, "income.mp4")

  That’s fine, but I want to change some the output parameters, specifically : alter the dimensions, the frame rate, and use a different codec.

  # change some of the options
  
  ani.options(ani.height = 1080, ani.width = 1920, 
  
              interval = 0.04166667, other.opts = "-vcodec qtrle -f mov")
  
  # re-animate
  
  gganimate(p, title_frame = FALSE, "income.mov")

  That gives me the following error :

  Error in animation_saver(saver, filename) : 
  
    Don't know how to save animation of type mov

  I’m using ’.mov’ as my file extension because I’m trying to change to the Animation codec (so it’s no longer a .mp4 wrapper). I’ve got ffmpeg installed, so this is probably a syntax issue. But the documentation isn’t very clear here ; gganimate doesn’t have any documentation on changing codecs (or outputting any video besides an mp4), and the animation package is light on specifics as well.