Videowriter Output missing on x86 Platforms

[jw-suh]

Summary of your issue

When using opencvsharp to create a mp4 file in a 32-bit WPF application, no output file is generated. Easily reproducible by creating a new Console Application (in my case .NET core 3.1) and adding the Platform Target x86. The error is reproducible with a console application, for completion’s sake we are encountering this issue in a WPF application.

Environment

Using .NET core 3.1 with the following Nuget Packages:

• OpenCvSharp4.Extensions Version 4.5.5.20211231
• OpenCvSharp4.Windows Version 4.5.5.20211231
• OpenCvSharp4.WpfExtensions Version 4.5.5.20211231

The application is built and run on a 64-bit Windows 10 machine

What did you do when you faced the problem?

Create a VideoWriter like so:

var videoWriter = new VideoWriter($@"C:\Temp\Snapshots\TestTimelapse\TestTimelapse.mp4", FourCC.Default, 20, new OpenCvSharp.Size(2304, 1296), true);

and add frames (in my case 100) to it with the Write() Method:

var allFrames = Directory
  .EnumerateFiles($@"C:\Temp\Snapshots\TestTimelapse", "*.jpg")
  .Select(file => new FileInfo(file))
  .OrderBy(file => file.CreationTime)
  .Select(file => File.ReadAllBytes(file.FullName))
  .Select(fileContent => Mat.FromImageData(fileContent, ImreadModes.AnyColor))
  .ToList();

foreach (var frame in allFrames)
  videoWriter.Write(frame);

videoWriter.Dispose();

Project to reproduce(~ 16kb): VideoWriterx86.zip

Picture to reproduce (~ 13mb): TestTimelapse.zip

Output:

The folder only contains the images and no additional file was created.

Console output:

OpenCV: FFMPEG: format mp4 / MP4 (MPEG-4 Part 14)
fourcc tag 0x7634706d/'mp4v' codec_id 000C
fourcc tag 0x31637661/'avc1' codec_id 001B
fourcc tag 0x33637661/'avc3' codec_id 001B
fourcc tag 0x31766568/'hev1' codec_id 00AD
fourcc tag 0x31637668/'hvc1' codec_id 00AD
fourcc tag 0x7634706d/'mp4v' codec_id 0002
fourcc tag 0x7634706d/'mp4v' codec_id 0001
fourcc tag 0x7634706d/'mp4v' codec_id 0007
fourcc tag 0x7634706d/'mp4v' codec_id 003D
fourcc tag 0x7634706d/'mp4v' codec_id 0058
fourcc tag 0x312d6376/'vc-1' codec_id 0046
fourcc tag 0x63617264/'drac' codec_id 0074
fourcc tag 0x7634706d/'mp4v' codec_id 00A3
fourcc tag 0x39307076/'vp09' codec_id 00A7
fourcc tag 0x31307661/'av01' codec_id 801D
fourcc tag 0x6134706d/'mp4a' codec_id 15002
fourcc tag 0x63616c61/'alac' codec_id 15010
fourcc tag 0x6134706d/'mp4a' codec_id 1502D
fourcc tag 0x6134706d/'mp4a' codec_id 15001
fourcc tag 0x6134706d/'mp4a' codec_id 15000
fourcc tag 0x332d6361/'ac-3' codec_id 15003
fourcc tag 0x332d6365/'ec-3' codec_id 15028
fourcc tag 0x6134706d/'mp4a' codec_id 15004
fourcc tag 0x61706c6d/'mlpa' codec_id 1502C
fourcc tag 0x43614c66/'fLaC' codec_id 1500C
fourcc tag 0x7375704f/'Opus' codec_id 1503C
fourcc tag 0x6134706d/'mp4a' codec_id 15005
fourcc tag 0x6134706d/'mp4a' codec_id 15018
fourcc tag 0x6134706d/'mp4a' codec_id 15803
fourcc tag 0x7334706d/'mp4s' codec_id 17000
fourcc tag 0x67337874/'tx3g' codec_id 17005
fourcc tag 0x646d7067/'gpmd' codec_id 18807
fourcc tag 0x316d686d/'mhm1' codec_id 15817

What did you intend to be?

I expected the frames to be added to a video file with the file extension .mp4

[jw-suh]

Can anyone confirm or deny that this issue exists outside of our development environment? We still have this issue and can reproduce it on all of our development machines.

[Guyiming]

I have the same problem.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.