Stair-stepping artifacts when exporting H.264 426x240 video for web

salils

salils

Well-known member
I'm trying to export a 16:9 video clip for web using H.264 compression at 426x240 resolution from compressor using square pixel aspect ratio. No matter what bit rate I set it at -- 600kbps-6,000kbps I still get these really jagged edges. Even though my source is DV, the original file does not have anything close to this; also I have never had this issue before. One other thing to note is that if I export at full resolution H.264 -- 640x360, I don't get any stair-stepping.

Here is a frame grab of the video with the problem:
http://salsunproductions.com/misc/crapy_artifacts-h264-frame.jpg

You can download a video clip of it here (data rate is around 600-700kbps):
http://salsunproductions.com/misc/crapy_artifacts-h264.mov

I'm also noticing some sort of horizontal lines in the artifacts?? This is progressive scan footage shot on a DVX100B 24pA (and captured properly w/2:3:3:2 pull down removal, the original file doesn't have this)
Any assistance would be greatly appreciated. This is getting really annoying having to export huge files...

PS: I'm using Compressor v3.0.2
 
Try using a different resolution, like 480x270, 320x180. etc, basically numbers that divide well from 640x360.
 
yeah...

Hey capt, when i go to view-external- i get all these options again! And i get my dual monitor...Then when i click it, and refresh devices..nothing happens....So weird
 
Don't do square pixels, it'll convert them to square when you encode!

(click HERE to download my apple dropplet. Just unzip, then drag your master file onto the droplett icon!)

Or if you want to manually select the paramiters, here's the settings for my 426x240 preset that works great!

Description: Small Web 426x240
File Extension: mov
Estimated file size: 351.56 MB/hour of source
Audio Encoder
IMA 4:1, Stero (L R), 48.000 kHz
Video Encoder
Format: QT
Width: 426
Height: 240
Pixel aspect ratio: NTSC CCIR 601/DV (16:9)
Crop: None
Padding: None
Frame rate: (100% of source)
Frame Controls: Off
Codec Type: H.264
Multi-pass: On, frame reorder: on
Pixel depth: 24
Spatial quality: 75
Temporal quality: 50
Min. temporal quality: 25
Average data rate: 0.819 (Mbps)
Hinted for QuickTime streaming server
 
You must log in or register to reply here.
Back
Top