KonoAmp 050

Hello,

a new version of KinoAmp is available from:

http://www.riscos-digitalcd.net/image/kinoamp/kinoamp.htm

Changes:

• Optimise de-interlacing.
• Add neon versions of idct, motion compensation and de-interlacing.
• Some of the previous changes where limiting the display rate while preforming speed tests with the display all frames options.
• Fix ZeroPain for .ts streams without program table.
• Fix in frame timestamps, most where lost in TS streams.
• Fix libmpeg2 aspect ratio, ignore display extention since we show everything.
• Fix rounding of chroma motion vectors.
• Improve a little bit handling of corrupted streams.

Yay! :) But argh, and I only just got round to uploading 0.49!

Regarding speed improvements, tested on DVD VOB files on my RPi3:
- neon reduces the mpeg2 decoding time by 30% (10% for motion compensation, the rest for idct).
- de-interlacing takes 40% less time with some optimisation, and neon only reduces it by 10% more.
- I trying using neon to optimise (bi-)linear scaling (i.e when not using overlays) to scale the video to 1920×1080 but the improvement was marginal, I guess here that the amount of memory used is the real bottleneck.

Basically, on the RPi3, this means for DVD: no change if using overlays (it was already more than fast enough), a few extra frames per seconds when scaling to full-HD (from 15 to 18 fps).

On HD side, with the files from the HDTV folder of MPlayer’s test samples, using overlays and playing this gave:
- between 13 and 18 fps for the 30fps 1920×1080i files
- between 35 and 45 fps for the 60fps 1280×720p files

So Full-HD should be just about “watchable”, that is if you have a very fast HD.
On my machine the 18fps mentionned above drops to 14fps from the Lacie 500MB (10fps using KinoAmp 0.49). I can only get around 7MB/s out of it from the RISC OS side and that means 40-50% of the playing time is spent reading these heavy files.

I wonder how much I could get out of a RPi4?

Yay! :) But argh, and I only just got round to uploading 0.49!

I know. I was hoping hoping to release it before you updated !Store, but that “rounding of chroma motion vectors” issue took me 2 whole days to track down.

I use KinoAmp to play the VOBs from a non protected DVD in a playlist.
Problem: The German audio channel is the second one. Every “next title” set the audio channel to the first one.
Ist it possible to play every title with the first selected?

Problem: The German audio channel is the second one. Every “next title” set the audio channel to the first one.

Indeed. Ah, I see it is a side effect of the “Autoselect stream” option in the Audio configuration. Disable that and it will keep the second channel.