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• 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.

• Ffmpeg script cuts out sound

  15 février 2019, par Liam

  I have this ffmpeg script I’m running to automatically convert videos to instagram’s accepted coded

  The script looks like this :

  ffmpeg -analyzeduration 20M -probesize 20M -y -re -f lavfi -i "movie=filename='file.mp4':loop=5, setpts=N/(FRAME_RATE*TB)" -vcodec libx264 -b:v 3500k -vsync 2 -t 59 -acodec aac -b:a 128k -pix_fmt yuv420p -vf "scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:white" -crf 24 new_file.mp4

  However that seems to cut out the audio, and I can’t seem to find out how to prevent that ? I didn’t use any -an or anything, and when messing around the audio keeps being cut out ? Any idea why ?