Good path for J2K MXF to x265?

[benwaggoner]

So, I'm trying to figure out a reasonably straightforward way to encode from a J2K MXF to x265. Obviously support isn't built in, but I'd hoped piping from ffmpeg.exe would do it, but the latest Zeranoe ffplay won't even open a video window with the J2K MXF file I'm playing with.

Has anyone gotten this to work without having to go through a (massive!) intermediate file?

[nevcairiel]

FFmpeg build with OpenJPEG should be able to read and decode them, and recent FFmpeg also has built in support for libx265 to directly convert it without pipes.

[poisondeathray]

^ yes, and Zeranoe's builds have OpenJPEG support, I've used it before on JPEG2000 MXF's before.

So there might be something peculiar about your MXF wrapper or your JPEG2000 video

[Blue_MiSfit]

Do you have any way to decode the j2k file? Maybe you can dump it out to uncompressed or lossless?

[benwaggoner]

^ yes, and Zeranoe's builds have OpenJPEG support, I've used it before on JPEG2000 MXF's before.

So there might be something peculiar about your MXF wrapper or your JPEG2000 video
I am suspecting it may be something along those lines.

[benwaggoner]

Do you have any way to decode the j2k file? Maybe you can dump it out to uncompressed or lossless?
So far, no. But these things are freaking huge before decompression. My hope is to use ffmpeg or similar to pipe into x265, which works for most formats.

[filler56789]

FWIW --- there exists a DirectShow MJ2 decoder from MainConcept, and it connects fine to LAV Splitter :) If your MXF contains "Digital Cinema" stuff, then it's probable that ffmpeg or libav cannot decode it : –/

[sneaker_ger]

What error does ffmpeg show? Can you force libopenjpeg? (ffmpeg -vcodec libopenjpeg -i INPUT ...)

[Blue_MiSfit]

I know that Kakadu is considered to be a top notch j2k implementation, maybe there's a decoder you can use?

[x265_Project]

MulticoreWare has a high performance library that supports accelerated IMF / MXF (J2K) decoding (color space conversion, etc). Contact me directly if you are interested in evaluating.

Tom