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• FFmpeg - inverting one of two audio files and merging them

  3 février 2023, par kubinka0505

  I want to merge two files with FFmpeg, but one with inverted phase.

  


  I've used following command, but It doesn't work.

  


  ffmpeg -i "Song.wav" -i "Vocals.wav" -filter_complex "[0:a][1:a]amerge=inputs=2,pan=stereo|c0=c0|c1=-c1[a]" -map [a] "Instrumental.wav"

  


  [Parsed_pan_1 @ 04c69000] Expected in channel name, got "-c1"
[AVFilterGraph @ 04b9bd80] Error initializing filter 'pan' with args 'stereo|c0=c0|c1=-c1'
Error initializing complex filters.
Invalid argument


  


  I've also tried multiple variants of c0code>, etc.

  


  What command should I use ? Or maybe there's an easier workaround ?

  


• Unable to load FFProbe - Ubuntu - Laravel 5.5

  6 décembre 2018, par Shreeraj

  I know there are already many questions asked over this issue. Been searching for the solution since last 2 days. I have found several forums :

  Ubuntu - Laravel 5.6 - Unable to load ffprobe (using php-ffmpeg)

  Unable to load FFProbe in laravel app

  getting error Unable to load FFprobe

  Laravel unable to load FFProbe ?

  Unable to load FFProbe driver for FFmpeg

  I have already tried all of the above suitable solutions but none worked.
  Also tried installing the below given packages.

  composer require sormagec/laravel-ffmpeg

  composer require pbmedia/laravel-ffmpeg (Didn’t work because of laravel version, I guess)

  I have set the binary paths correctly :

  return [
  
  'default_disk' => 'local',
  
  
  
  'ffmpeg.binaries' => '/usr/bin/ffmpeg',
  
  'ffmpeg.threads'  => 12,
  
  
  
  'ffprobe.binaries' => '/usr/bin/ffprobe',
  
  
  
  'timeout' => 3600,
  
  ];

  I am using Laravel 5.5 version

  I am not sure what else is missing or where am I lacking. I have installed ffmpeg in my ubuntu. And other required packages in my Laravel application. Please help me out if anything else is missing.

• OUTPUT webcam video over rtp

  20 août 2013, par Manjinder Singh Sekhon

  I'm currently trying to stream webcam video from beagleboard black to my laptop and am using this line of code :

  avconv -f video4linux2 -i /dev/video0 -debug -vcodec mpeg2video -r 25 -pix_fmt yuv420p -me_method epzs -b 2600k -bt 256k -f rtp rtp ://192.168.1.12:5004

  the program starts working, but after a while it doesn't really do anything.
  debug log :

  avconv version v0.8.4, Copyright (c) 2000-2012 the Libav developers
  
    built on May 20 2013 13:00:42 with gcc 4.7.3 20130205 (prerelease)
  
    configuration: --enable-shared --enable-pthreads --enable-gpl --enable-postproc --enable-avfilter --cross-prefix=arm-angstrom-linux-gnueabi- --prefix=/usr --enable-avserver --enable-avplay --enable-x11grab --enable-libtheora --enable-libvorbis --enable-libx264 --arch=arm --target-os=linux --enable-cross-compile --extra-cflags=' -fexpensive-optimizations -fomit-frame-pointer -O4 -ffast-math -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a8 --sysroot=/build/v2012.12/build/tmp-angstrom_v2012_12-eglibc/sysroots/beaglebone' --extra-ldflags='-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed' --sysroot=/build/v2012.12/build/tmp-angstrom_v2012_12-eglibc/sysroots/beaglebone --enable-hardcoded-tables --cpu=cortex-a8
  
    libavutil    51. 22. 1 / 51. 22. 1
  
    libavcodec   53. 35. 0 / 53. 35. 0
  
    libavformat  53. 21. 0 / 53. 21. 0
  
    libavdevice  53.  2. 0 / 53.  2. 0
  
    libavfilter   2. 15. 0 /  2. 15. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  52.  0. 0 / 52.  0. 0
  
  [video4linux2 @ 0x2dae0] [3]Capabilities: 84000001
  
  [video4linux2 @ 0x2dae0] Querying the device for the current frame size
  
  [video4linux2 @ 0x2dae0] Setting frame size to 640x480
  
  [video4linux2 @ 0x2dae0] The V4L2 driver changed the pixel format from 0x32315559 to 0x56595559
  
      Last message repeated 1 times
  
  [video4linux2 @ 0x2dae0] The V4L2 driver changed the pixel format from 0x50323234 to 0x56595559
  
  [video4linux2 @ 0x2dae0] The V4L2 driver set input_id: 0, input: Camera 1

  from what I can see, the program stops because it can't get any input from webcam. The webcam works when I use a opencv program.(so /dev/video0 definitly works.) Any ideas. I've also tried using ffmpeg, but i get message that I should use avconv.