Why Screencast blurry after rendering? for iPad

[poing]

I made a screencast of my desktop. It's 1024x768, 15fps, Theora .ogv at quality 100 created using gtk-recordMyDesktop on Ubuntu.

That file's quality is flawless. Now, when I try to render it to something an iPad would play, it becomes rather blurry.

I'm rendering to Kdevlive's default preset for iPhone, with the resolution changed to 1024x768.
I tried tweaking the options (resolution and bitrate), but even 10,000k was blurry.

What could be the reason? Does it have anything to do with Progressive/Interlaced? or something else I'm not aware of?

Here are my rendering settings in Kdenlive:

s=1024x768 aspect=%dar progressive=1 acodec=aac ab=128k vcodec=libx264 b=1000k flags=+loop cmp=+chroma partitions=+parti8x8+parti4x4+partp8x8+partb8x8 me_method=umh subq=7 me_range=16 g=250 keyint_min=25 sc_threshold=40 i_qfactor=0.71 qcomp=0.6 qmin=10 qmax=51 qdiff=4 directpred=1 trellis=1 coder=0 bf=0 refs=3 flags2=-wpred-dct8x8 level=30 maxrate=10000k bufsize=10000k wpredp=0

[jagabo]

h.264 uses 4:2:0 chroma subsampling. Small colored objects and sharp colored edges will always get blurred. Some examples:
https://forum.videohelp.com/threads/294144-Viewing-tests-and-sample-files?p=1792760&vie...=1#post1792760
https://forum.videohelp.com/threads/308120-Quality-loss-from-D-V-AVI-to-other-formats?p...=1#post1897056

[poing]

h.264 uses 4:2:0 chroma subsampling. Small colored objects and sharp colored edges will always get blurred.

So there's no way I can display sharp colored edges on an iPad given the fact that it requires H.264?

[jagabo]

I added links to some examples to my previous post. Are you seeing something worse than that?

[poing]

It's exactly what I'm seeing, so that seems to be the source of the problem. Is there a way of using 4:4:4: with a format that'll be readable on an iPad? (ideally H.264)

EDIT: I noticed this section in the Kdenlive settings I posted above:

cmp=+chroma partitions=+parti8x8+parti4x4+partp8x8+partb8x8

Wouldn't that have something to do with chroma subsampling?

EDIT2: Wikipedia says it's possible with profile High 4:4:4 Predictive Profile (Hi444PP)

[poisondeathray]

ipad doesn't support 4:4:4 profile . Heck most h.264 software decoders don't even support it (yet)

[poing]

I'll have to wait, I guess.

[jagabo]

Wait? Your ipad isn't going to improve with age!

[poisondeathray]

^yeah it's not something that can be improved by a firmware fix. It's a hardware decoding chip issue. Maybe ipad version 6 or something in 2024. But by then we will have quadHD resolution on ipad

[poing]

^yeah it's not something that can be improved by a firmware fix. It's a hardware decoding chip issue. Maybe ipad version 6 or something in 2024. But by then we will have quadHD resolution on ipad

Wow, that long?