Now that J2K decoder could be utilized in FFmpeg and it could be included in FFmpeg processing workflow as a part of any complicated task. Externally it looks like conventional decoder with internal multithreading. We’ve implemented FFmpeg J2K decoder which is working on GPU with batch of images in multithreaded mode to achieve maximum performance. To create conventional FFmpeg codec for fast J2K encoding or decoding on GPU, we’ve taken into account architectures of FFmpeg applications and FFmpeg codecs. That NVIDIA codec supports H.264 and H.265 codecs and much more. As soon as most of FFmpeg codecs and filters are working on CPU, both input and output of each processing module are at CPU memory, though currently FFmpeg is also capable to work with GPU-based NVENC encoder and NVDEC decoder on NVIDIA GPUs. Here you can see JPEG2000 benchmarks on CPU and GPU for J2K encoding and decoding with OpenJPEG, Jasper, Kakadu, J2k-Codec, CUJ2K, Fastvideo codecs to check the performance for images with 2K and 4K resolutions (both for lossy and lossless algorithms).įFmpeg usage is based on the idea of consequtive software modules which are applied to your data. OpenJPEG is still very slow even after recent boost with optimization and multithreading. As soon as J2K algorithm has very high computational complexity, OpenJPEG is running not fast even with multithreading.
OpenJPEG codec is very interesting product, but it’s working on CPU only. OpenJPEG is quite reliable and sofisticated solution with wide set of features from JPEG2000 Standard. This is not a good choice, so we can install OpenJPEG library (libopenjpeg) as default FFmpeg codec for J2K encoding and decoding on CPU. Lossless encoding can be selected with -pred 1”. In the FFmpeg documentation we can see the following: “The native jpeg2000 encoder is lossy by default, the -q:v option can be used to set the encoding quality. For a start we could answer the following very simple question - which JPEG2000 codec is working at FFmpeg by default? Surprisingly, this is not OpenJPEG codec.
0 kommentar(er)
