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Usage instructions for OMAF Creator viewport independent mode
omafvi.exe -i file.mp4 -o omafvi.mp4
omafvi.exe -i file_TB.mp4 -o omafvi.mp4
You need to first encode and package the raw sequence to traditional mp4 file in HEVC format.
ffmpeg is one option to create mp4 files. You need to have ffmpeg built with a HEVC/H.265 encoder, e.g. libx265, see instructions here:
https://trac.ffmpeg.org/wiki/Encode/H.265
There are also other HEVC encoders available for ffmpeg, e.g. Kvazaar. The command line parameters have to be modified accordingly. And further, there are other compatible solutions than ffmpeg for doing the mp4 packaging, e.g. mp4box.
In this example, we use uncompressed YUV input having a resolution of 3840 x 1920 pixels, and 30 fps framerate.
ffmpeg.exe -f rawvideo -pix_fmt yuv420p -s:v 3840x1920 -r 30 -i video.yuv -c:v libx265 file.mp4
omafvi.exe -i file.mp4 -o omafvi.mp4
Note! If the input YUV is framepacked stereo (top-bottom or left-right), the output name from ffmpeg need to be extended by either _TB or _LR, i.e. file_TB.mp4
or file_LR.mp4
, depending on the framepacking order.
omafvi.exe -i file.mp4 -o omafvi.mpd
Note: the input file need to have GOPs of a fixed length, e.g. 90 frames.
The output consists of:
omafvi.mpd
omafvi.mono.init.mp4
omafvi.mono.1.mp4
- ...
omafvi.mono.N.mp4
where N is file duration divided by GOP duration, e.g. if the video file is 30 seconds long, has 30 fps framerate, and contains GOPs of 90 frames, the N == 10, i.e. 10 media segments get generated.
Further, if the file.mp4 also contains audio, the following files get generated as well:
omafvi.audio.init
omafvi.audio.1.mp4
- ...
omafvi.audio.N.mp4
See above for ffmpeg installation.
The input YUV has resolution 3840 x 1920 pixels, and framerate of 30 fps. We set GOP length as 60 frames == 2 seconds.
ffmpeg.exe -f rawvideo -pix_fmt yuv420p -s:v 3840x1920 -r 30 -i video.yuv -c:v libx265 -g 60 file.mp4
omafvi.exe -i file.mp4 -o omafvi.mpd