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• Issue with yt-dlp and FFMPEG Converting Webm to MP4 for 360 video : Unsupported channel layout "ambisonic 1"

  22 janvier 2024, par William L W L

  I am trying to convert .webm files to mp4. These are 360 videos that have been downloaded using yt-dlp.

  


  I have been using this command successfully, but it does not work on an M2 macbook pro. It works fine on PC.

  


  ffmpeg -y -i "/Users/x/Movies/Tropical_Rainforest_360.webm" -c:v libx265 -preset fast -crf 21 -vf "scale=4096x4096:out_range=full" -pix_fmt yuvj420p -aspect 1:1 -movflags faststart "/Users/x/Movies/Tropical_Rainforest_360.mp4"


  


  The error messages are as follows :

  


  [aac @ 0x12ae1fea0] Unsupported channel layout "ambisonic 1"
[aac @ 0x12ae1fea0] Qavg: nan
[aost#0:1/aac @ 0x12ae1fc30] Error while opening encoder - maybe incorrect parameters such as bit_rate, rate, width or height.
Error while filtering: Invalid argument
[swscaler @ 0x110dd0000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x120158000] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0x130208000] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 1 times
[out#0/mp4 @ 0x600003f8c480] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A    
Conversion failed!



  


  Context : I work in an educational setting which caters for vulnearble pupils. We cannot use Youtube in real time, this is mainly due to adverts or suggested videos that may trigger our pupils. Some children have mental health issues. Some children have also not been outdoors for several months/years due to medical conditions. We use 360 videos and VR to help bring the outside world inside, The YoutubeVR app is not an option since there is no way to install adblockers.

  


  The same script above works fine on a PC virtual machine which I can remote into from my Mac.

  


• 2 GB Should Be Enough For Me

  31 août 2010, par Multimedia Mike — General

  My new EeePC 1201PN netbook has 2 GB of RAM. Call me shortsighted but I feel like “that ought to be enough for me”. I’m not trying to claim that it ought to be enough for everyone. I am, however, questioning the utility of swap space for those skilled in the art of computing.

  
  
  Technology marches on : This ancient 128 MB RAM module is larger than my digital camera’s battery charger… and I just realized that comparison doesn’t make any sense
  

  Does anyone else have this issue ? It has gotten to the point where I deliberately disable swap partitions on Linux desktops I’m using ('swapoff -a'), and try not to allocate a swap partition during install time. I’m encountering Linux installers that seem to be making it tougher to do this, essentially pleading with you to create a swap partition– “Seriously, you might need 8 total gigabytes of virtual memory one day.” I’m of the opinion that if 2 GB of physical memory isn’t enough for my normal operation, I might need to re-examine my processes.

  In the course of my normal computer usage (which is definitely not normal by the standard of a normal computer user), swap space is just another way for the software to screw things up behind the scenes. In this case, the mistake is performance-related as the software makes poor decisions about what needs to be kept in RAM.

  And then there are the netbook-oriented Linux distributions that insisted upon setting aside as swap 1/2 gigabyte of the already constrained 4 gigabytes of my Eee PC 701′s on-board flash memory, never offering the choice to opt out of swap space during installation. Earmarking flash memory for swap space is generally regarded as exceptionally poor form. To be fair, I don’t know that SSD has been all that prevalent in netbooks since the very earliest units in the netbook epoch.

  Am I alone in this ? Does anyone else prefer to keep all of their memory physical in this day and age ?

• ffmpeg usage in Android Studio

  8 septembre 2017, par sargis_74

  I try to use ffmpeg sources in Android Studio under Windows10.
  I built the ffmpeg.3.3.3 under ubuntu on Virtual Box by the followinf script and integrated the sources into Android Studio project :

  #!/bin/bash
  
  NDK=/etc/FFmpegOnAndroid/android-ndk-r14b
  
  SYSROOT=$NDK/platforms/android-21/arch-x86_64
  
  TOOLCHAIN=/etc/FFmpegOnAndroid/android-ndk-r14b/toolchains/x86_64-4.9/prebuilt/linux-x86_64
  
  CPU=arm
  
  PREFIX=/etc/FFmpegOnAndroid/ffmpeg-3.3.3/output
  
  ADDI_CFLAGS="-fomit-frame-pointer"
  
  function build_one
  
  {
  
      ./configure \
  
          --prefix=$PREFIX \
  
          --enable-shared \
  
          --disable-static \
  
          --disable-doc \
  
          --disable-doc \
  
          --disable-symver \
  
          --enable-small \
  
          --cross-prefix=$TOOLCHAIN/bin/x86_64-linux-android- \
  
          --target-os=linux \
  
          --arch=x86_64 \
  
          --enable-cross-compile \
  
          --sysroot=$SYSROOT \
  
          --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
          --extra-ldflags="$ADDI_LDFLAGS" \
  
          $ADDITIONAL_CONFIGURE_FLAG
  
      make clean
  
      make
  
      make install
  
  }
  
  build_one

  When I execute the following command under ubuntu, the output file is created without losing the quality :

  ffmpeg -i sample_2.mp4 -i ic_launcher.jpg -filter_complex [1:v]scale=70:-1[wm];[0:v][wm]overlay=W-w-10:H-h-10[out] -map 0:a? -map [out] output.mp4

  but when I call main() function of ffmpeg.c in Android studio with same arguments, the quality of output file is lost.

  Here are the difference of info of created output files :

  Android Studio :

  Stream #0:1(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1200x720 [SAR 1:1 DAR 5:3], 585 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)

  ubuntu :

  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1200x720 [SAR 1:1 DAR 5:3], 423 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)

  Could you please help me to solve this problem.

  Thanks in advance,

  Sargis Boyajyan