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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.

  


• IPython.display Video giving an unplayable "empty" video when trying to run an animation from previous plots (Using ffmpeg)

  17 novembre 2023, par drhode

  I am working on a crater simulation project for a class and am running into a problem when it comes to creating a video. The general project is for us to simulate a surface being hit by craters until it becomes saturated. The code works, however, if I print out every graph in the simulation it would be thousands of graphs until sat is reached and then I would have to manually clip them all together. To circumvent this, I would like to take all the graphs and put them into an animation. I however, have no idea where to even start.

  


  for reference, here is main code block :

  


  import matplotlib.pyplot as plt
import numpy as np
import math
import os
import matplotlib.animation as ani

#I have removed the definitions and class implementation for sake of simplicity and space

ani.writers.list()
FFMpegWriter = ani.writers['ffmpeg']
writer = FFMpegWriter(fps = 10)
fig = plt.gcf()
figure = plt.figure()
fig.patch.set_alpha(1.0)

with writer.saving(figure, "sine.mp4", 150):
    while sat_counter !=1:#while loop that will introduce new crater each iteration

        new_crater = generate_crater()
        new_crater.age = sat_counter
        random_crater_list.append(new_crater)

        i =0

        while i < len(random_crater_list):#looping through the crater list and comparing new crater to all others


            old_crater = random_crater_list[i]


            overlap = square_overlap(old_crater, new_crater)#checks if old crater should be covered/removed by new crater
          

            if overlap == True:
                    random_crater_list.remove(old_crater)
                    i=i-1

                    
            else:
                pass

            i=i+1

        sat = Saturation(random_crater_list)# checks the saturation of the graph and returns a a number between 0 and 100
        if sat > 90:
            sat_counter = 1#base condition used to break the while loop

        writer.grab_frame()
plot_craters(random_crater_list)                   



  


  Here is what the final graph looks like
saturated surface

  


  I have tried to use the IPython.display video :

  


  
Video("sine.mp4", embed = True, width = 320, height = 320)


  


  This however loads an empty video that is unplayable.
empty video

  


• Handling "NullReferenceException" when executing "ffmpeg.exe" process in C# [duplicate]

  1er juillet 2023, par FrostDream

  I'm trying to execute the "ffmpeg.exe" process in my C# application to process media files. However, I'm encountering a "NullReferenceException" when running the code. I've tried various approaches, including using a try-catch block, but the exception still persists. Here's the relevant code snippet :

  


  bool isValidMedia = true;

try
{
    Process process = new Process();
    process.StartInfo.FileName = "ffmpeg.exe";
    process.StartInfo.Arguments = $"-i \"{file}\" -f null -";
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardOutput = true;
    process.StartInfo.CreateNoWindow = true;
    process.OutputDataReceived += (sender, e) =>
    {
        if (!string.IsNullOrEmpty(e.Data))
        {
            int startIndex = e.Data.IndexOf("samples=") + 8;
            button.Width = int.Parse(e.Data.Substring(startIndex, e.Data.IndexOf(" ") - startIndex)) / zoom * 100;
        }
        else
        {
            isValidMedia = false;
        }
    };

    process.Start();
    process.BeginOutputReadLine();
    process.WaitForExit();
}
catch
{
    isValidMedia = false;
}

if (!isValidMedia)
{
    MessageBox.Show("Not a valid media.");
    return;
}



  


  I suspect that the issue may be related to the asynchronous execution of the event handler or the initialization of the ProcessStartInfo object. Can anyone please help me identify the cause of the "NullReferenceException" and provide guidance on how to resolve it ? Thank you in advance for your assistance.