Help: Output of a valid XDCAM HD422

[SchwartzWare]

Hello, I want to ouput a valid MXF in the XDCAM HD422 format. I already got it to ouput the MXF with the video and MediaInfo recognizes that its a XDCAM HD422 but its not fully valid so I can't import it into Vegas Pro. When I set the flag "ilme" it is interlaced as intended but bottom first. It needs to be top first. But when I set parameter "top" to 1 it gets ignored. When I try this with a standalone version of FFMPEG it works. The next problem would be that a valid XDCAM HD422 need to audio tracks. How can I achieve this?

Here the questions in short:

1. How can I set the field order of the video interlacing to "top field first"?
2. How can I add those 2 audio tracks with JavaCV?

Thanks in advance.

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Valid XDCAM HD422 encoded with Adobe Media Encoder:

My current output (Don't wonder about the differentz file size. It's not the same source.):

[saudet]

We will probably need to enhance FFmpegFrameRecorder for that. It shouldn't be too hard to update, so let me know if you encounter any issues while making modifications by yourself, and I will help. Thanks!

[SchwartzWare]

This is the command of the FFMPEG behavior I want to reproduce in JavaCV: ffmpeg -t 5 -loop 1 -i input.png -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -vcodec mpeg2video -s 1920x1080 -b:v 50000k -minrate 50000k -maxrate 50000k -r 25 -flags ilme -top "1" -pix_fmt yuv422p -profile:v 0 -level:v 2 -acodec pcm_s24le -ar 48000 -shortest -map 0:0 -map 1:0 -map 1:0 output.mxf It converts an image to a valid 'XDCAM HD422' MXF video file.

As mentioned before I can export a video file yet. But its not valid. In Java the 'input.png' would be a BufferedImage. A workaround would be to export a uncompressed video and then execute the command directly with FFMPEG. But it would be slicker if it would run inside JavaCV without a temp file.

I don't really know where to start.

[saudet]

Yes, I understand that. Please consider making a contribution. I will help if you encounter any issues.

[saudet]

For starters, read the source code of FFmpegFrameRecorder and try to understand how it works.

[SchwartzWare]

Maybe I will try this when I have enough spare time but for now I used a fairly new library called Jaffree to do what I wanted to do. For my case it was easier to use and worked out of the box.

Anyway thank you for your help, until now.

[saudet]

BTW, with commit https://github.com/bytedeco/javacpp-presets/commit/13ffffd191fa48d9d9d1d8a64e0c4d64c9da1134 the ffmpeg program itself now gets bundled, so we can use it easily from Java. For this case, we could do something like the following:

   String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
   ProcessBuilder pb = new ProcessBuilder(ffmpeg, "-t", "5", "-loop", "1", "-i", "input.png", "-f", "lavfi", "-i", "anullsrc=channel_layout=mono:sample_rate=48000", "-vcodec", "mpeg2video", "-s", "1920x1080", "-b:v", "50000k", "-minrate", "50000k", "-maxrate", "50000k", "-r", "25", "-flags", "ilme", "-top", ""1"", "-pix_fmt", "yuv422p", "-profile:v", "0", "-level:v", "2", "-acodec", "pcm_s24le", "-ar", "48000", "-shortest", "-map", "0:0", "-map", "1:0", "-map", "1:0", "output.mxf");
   pb.inheritIO().start().waitFor();

Please give it a try with 1.5-SNAPSHOT before the release: http://bytedeco.org/builds/

[saudet]

FYI, the JavaCPP Presets for FFmpeg and Jaffree are fully complimentary. Something like this should work just fine out of the box:

     String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
     FFmpeg.atPath(Paths.get(ffmpeg).getParent())...

This way, we don't need to have FFmpeg installed on the system.