Recently I’ve posted a short review of DPCM-based video codecs where Indeo 2 and 3 were mentioned, but what about Indeo 1? Previously I believed that it’s their raw format aka IF09 (YVU 4:1:0 with 7 bits per component) but recently I’ve discovered a codec called Indeo YVU9 Compressed, which kinda fills the gap between […]| Kostya's Boring Codec World
Since I can’t do anything but look at various codecs, I did exactly that. So here are some details about codecs nobody cares about. First, I looked at a video codec used in videos (movies and TV series) for certain hand-held console. Despite it coming from Majesco, video data start with VXGB magic, reminding of […]| Kostya's Boring Codec World
Back in mid-1990s there was a situation when video on computers was slowly getting in demand while the processing power was still very limited. Old paletted video formats were slowly going away (Smacker still holding strong though) and for hi-colour video RLE was not a good choice in terms of compression and DCT was not a good choice in terms of CPU cycles required. Thus the niche was partially filled by block-based vector quantisation codecs (like Cinepak) and various codecs that compressed ...| Kostya's Boring Codec World
I’m almost done with Motion Pixels at last. Of course I skipped implementing some exotic modes but at least the files I could find play fine and don’t complain about missing modes. I just need to put finishing touches and commit it all, probably on Saturday. The next post should be dedicated to intricate details […]| Kostya's Boring Codec World
First of all, here’s some information for the context: MVI codecs rely on out-of-band flags to signal what capabilities and subsampling they use (the fact that they decided to store those flags in FOURCC is a different annoyance); and despite the potential variety, only couple of flags are used for each codec. For instance, of […]| Kostya's Boring Codec World
In last post I wrote about how I’ve managed to reconstruct a recognizable picture for MVI1 codec. After I fixed the prediction code it started to work properly. Surprisingly, Treasure Quest game proved to be a source of MVI1 files in all formats (RGB, YUV422, YUV420, YUV410 and YUV4½0—the last one has one set of […]| Kostya's Boring Codec World
As I mentioned last month, I decided to reverse engineer Motion Pixel codecs and after a lot of failed attempts to make decoder work I’ve finally got something.| Kostya's Boring Codec World
Since I have not tweaked any weights and have not made any releases, I’ll just write about some stuff I’ve been working on but have not released yet. Meanwhile librempeg got support for a bunch new formats too so its changelog may be a more interesting read. Anyway, this post is about what I have (and haven’t) done.| Kostya's Boring Codec World
Since I can’t do anything about the world largest countries run by over 70-year old dictators, I try to find a distraction elsewhere. It usually works only until the next time I read next. Anyway, here’s something different for a change.| Kostya's Boring Codec World