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• Video editing in UWP apps

  23 septembre 2021, par MatS2510

  I'm creating an video downloading app in C# and Universal Windows Platform. App downloads movies in three different file sets depending on the source :

  


  

  • .ts audio & video file

  


  • .mp4 only video file and .webm only audio file

  


  • .mp4 audio & video file
The video lenghts, on which I tested the app, range from a few seconds to several hours. Video qualities are standard YouTube qualities.

  


  


  The next step is video editing. User can specify start and end trimming timestamp. Video can be saved in three different modes :

  


  

  • Audio & Video

  


  • Only audio

  


  • Only video

  


  


  This is where the problem begins.

  


  I can't use FFmpeg as executable, because UWP framework doesn't allow to run external app.

  


  So I tried to use Windows.Media.Editing library. It works fine with all .mp4 audio & video files and some .ts files (but only with short videos up to an hour). Other cases throws two types of exceptions :

  


  

  • System.Exception
HResult=0xC00DA7FC
Message=Stream is not in a state to handle the request. Stream is not in a state to handle the request.
Source=System.Private.CoreLib

  


  • System.Exception
HResult=0xC00D6D60
Message=A valid type has not been set for this stream or a stream that it depends on. (Exception from HRESULT : 0xC00D6D60)
Source=System.Private.CoreLib

  


  


  I wrote a separate question about it : Exception when rendering a video in UWP . Here is also a link to an example (In comments with sample videos, which causes an error. Link to github repository.) that downloads and tries to convert the .ts file to the .mp4 file.

  


  So I decided to try the most complicated solution. I created a C++ DLL project and set build output destination to the new folder in the main app project folder (and set this folder to copy to build output directory). I installed an ffmpeg libraries by vcpkg and imported them in C++ project.
Here is the .cpp file :

  


  #include "pch.h"
#include "mux.h"

extern "C" {
    #include "libavformat/avformat.h"
}

int test() {
    av_register_all();
    return 0;
}


  


  Here is the header :

  


  #pragma once

#ifdef FFMPEGLIB_EXPORTS
#define FFMPEGLIB_API __declspec(dllexport)
#else
#define FFMPEGLIB_API __declspec(dllimport)
#endif

extern "C" FFMPEGLIB_API int test();


  


  And here is the C# class where is imported C++ function :

  


  class FFmpeg
{
    [DllImport(@"FFmpeg\FFmpegLib.dll")] private static extern int test();

    public static void Test()
    {
        test();
    }
}


  


  But calling an Test() void throws an error :
System.DllNotFoundException : 'Unable to load DLL 'FFmpeg\FFmpegLib.dll' or one of its dependencies : The specified module could not be found. (Exception from HRESULT : 0x8007007E)'

  


  There are also ffmpeg libraries (avcodec-58.dll, avformat-58.dll, avutil-56.dll, swresample-3.dll) in FFmpeg folder.
I also tried to import avformat-58.dll directly in C# (main app project) and call av_register_all() function, but it throws the same exception. I also checked if I could include "libavformat/avformat.h" in C++ UWP app, but it shows error "cannot open source file "libavformat/avformat.h"". I guess that C libraries are incompatible with UWP, but I'm not sure.

  


  I have no more ideas. If it is not possible to use the methods I have mentioned, my question is Are there any other ways to process videos in UWP app ?

  


• Concatenating audio files and superimposing over video

  25 avril 2022, par kah

  I'm trying to write a program that takes a bunch of videos from a folder, compiles them, and then takes another bunch of audio files from a folder and concatenates them to then overlay the combined audio on top of the final video (hope that makes sense). I'm able to process the videos into one final output video, but I keep running into trouble combining the audio. Below I've provided two small sections of code pertaining to audio comp, I'm using moviepy to process the videos and attempting to use it for audio as well.

  


  songDirectory = './songs/'
songList = []
songs = []
audioclip=''

def makeCompilation():
    for filename in os.listdir(songDirectory):
        f = os.path.join(songDirectory, filename)
        if os.path.isfile(f) and filename.endswith(".mp3"):
            audioclip = moviepy.editor.AudioFileClip(f)
            songList.append(filename)


    for song in os.listdir(songDirectory):
        c = os.path.join(songDirectory, song)
    audio_clips = moviepy.editor.AudioFileClip(c)
    audio_output = moviepy.editor.concatenate_audioclips(audio_clips)
    finalClip = concatenate_videoclips(videos, method="compose")
    final_duration = finalClip.duration    
    final_audio_output = audio_output.set_duration(final_duration)
    final_output= finalClip.set_audio(final_audio_output).fx(afx.audio_fadein, 3.0)


    audio_path = "./songs/tempaudiofile.m4a"

    #print(description)
    # Create compilation
    final_output.write_videofile(outputFile, threads=8, temp_audiofile=audio_path, remove_temp=True, codec="libx264", audio_codec="aac")

    return description


  


  The program appeared to be able to find the audio directory, but I needed to be able to use os.path.join(songDirectory, filename) to point directly to each mp3 file so I messed around with it until I got the above code. And when I attempted to iterate through songList, I, as expected, got an error saying that 'str' wasn't iterable, and other errors saying that 'str' has no attribute 'duration'. Essentially, all I need it to do is iterate though the input folder and combine the files by whatever means. Code currently returns the output :

  


  &#127794;Free Fredobagz x Aflacko x Flint type beat - &#x27;Default_Dance&#x27; [prod. kah]-jro0v6ogZ0Y.mp4&#xA;225.05&#xA;Total Length: 225.05&#xA;225.05&#xA;Traceback (most recent call last):&#xA;  File "/Users/daddyK/Desktop/comp_ bot/make_compilation3.py", line 127, in <module>&#xA;makeCompilation(path = "./videos/",&#xA;  File "/Users/daddyK/Desktop/comp_ bot/make_compilation3.py", line 110, in makeCompilation&#xA;audio_output = moviepy.editor.concatenate_audioclips(audio_clips)&#xA;  File "/Users/daddyK/Library/Python/3.10/lib/python/site-packages/moviepy/audio/AudioClip.py", line 315, in concatenate_audioclips&#xA;durations = [c.duration for c in clips]&#xA;TypeError: &#x27;AudioFileClip&#x27; object is not iterable&#xA;</module>

  


  ---

  


  At this point I'm a bit stumped, so if anybody could offer some insight as to what I should do to resolve the error and/or if I'm headed in the right direction code-wise I'd greatly appreciate it ! Sorry if the code doesn't make any sense I'll post the whole .py file if needed

  


• I need help setting up a FFmpeg command that adds a small watermark in the bottom right of the first 5 seconds of multiple videos [closed]

  23 avril 2024, par hwm

  There are hundreds of videos that we'd like to add a small FFmpeg watermark to the bottom right during the first 5 seconds of each video. I don't know if there's a way to automate the command to all files in the folder, and if there is a way to make the output filename the same as the original video, or adding a -2 to the new filename. Some videos may have different file formats.

  


  Not sure if there's an app that can facilitate this for someone not well versed in programming, or can help do it to all the videos with one command. This could potentially be done in Linux, Windows or Mac. If the command changes based on OS, please let me know what the process would be for that specific OS.

  


  This is for a large project we are planning on releasing for free to the public fan space. Thanks !

  


  I can likely find someone that's more competent than me but getting the full command line to make this seamless would be ideal.