<p>I'm working on a video incorporating Flash animation into Premiere Pro to then upload to YouTube. When I upload it to YouTube however the diagonal lines are terribly distorted:</p>

<p>Youtube:</p>

<p><img src="https://i.sstatic.net/WtUYx.jpg" alt="laser on youtube"></p>

<p>Flash:</p>

<p><img src="https://i.sstatic.net/MWtRZ.jpg" alt="laser on flash"></p>

<p>What should I be checking for either in Flash or Premiere to ensure those lines are crisp when published on YouTube?</p>

CC BY-SA 3.0
2015-06-10T03:42:57.577Z
What you're probably seeing there is an artefact of chroma subsampling. Youtube videos are usually compressed as h.264 with 4:2:0 subsampling. What this means is that colour is sampled at a quarter of the resolution of brightness. A workaround would be to use a less saturated red.
stib
CC BY-SA 3.0
2015-06-10T16:13:30.660Z
@stib using HSL in Flash I lowered Saturation to 80% on the red, it helped a decent amount. Might try lowering it a bit more to find a sweet spot. If you want to leave that as an answer then I'll mark it correct.
Ryan
CC BY-SA 3.0
2015-06-10T16:26:55.353Z
Lowering it to 60% while not as vibrant as I might like completely fixes the distortion. Thanks!
Ryan
<youtube><animation-rendering><flash>
How to get a better quality diagonal line from Flash to YouTube?
Ryan
# How to get a better quality diagonal line from Flash to YouTube?

(Asked by: username_0 on 2015-06-08)

I'm working on a video incorporating Flash animation into Premiere Pro to then upload to YouTube. When I upload it to YouTube however the diagonal lines are terribly distorted:

Youtube:

![laser on youtube](https://i.sstatic.net/WtUYx.jpg)

Flash:

![laser on flash](https://i.sstatic.net/MWtRZ.jpg)

What should I be checking for either in Flash or Premiere to ensure those lines are crisp when published on YouTube?

**Tags:** youtube, animation-rendering, flash

> **Comments:**
> **username_1**: What you're probably seeing there is an artefact of chroma subsampling. Youtube videos are usually compressed as h.264 with 4:2:0 subsampling. What this means is that colour is sampled at a quarter of the resolution of brightness. A workaround would be to use a less saturated red.  
> **username_0**: @username_1 using HSL in Flash I lowered Saturation to 80% on the red, it helped a decent amount. Might try lowering it a bit more to find a sweet spot. If you want to leave that as an answer then I'll mark it correct.  
> **username_0**: Lowering it to 60% while not as vibrant as I might like completely fixes the distortion. Thanks!  

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## 0 answers

