[Brian Darwin]

Sorry it took so long for me to get back to this thread, but here’s another update.

I just edited a roller derby video and the same kind choppiness is happening (https://www.youtube.com/watch?v=24-Cf_ndcoI). Again, this isn’t a buffering problem (it still happens after the video has completely loaded); it’s a slight jittery choppiness that happens at random points throughout my videos, and never really in the exact same places. In addition, the clarity seems pretty pixelly compared to other 360p videos online. The vids aren’t as choppy and unclear in 720p, obviously, but one of my questions is why doesn’t my 360p quality seem as clear and smooth as other 360p YouTube videos (I.E,. any music video, College Humour video, etc? I know they’ve got better equipment, but I’m shooting with a Sony EX1, which isn’t a terrible cam). Something tells me that I’m not color correcting correctly either – could this be part of the problem? I’m self taught, so I’m not sure what’s “acceptable” for color levels… I just sort of go until it looks good — any info on this would be great. Sorry for being so irritatingly amateur…

Here’s the media info stats for the Roller Derby video I posted above in case anyone’s curious (info collected by MediaInfo program):

General

Complete name: /Users/TVZ/Desktop/Projects/Roller Derby/Exporting/Audio Correct/Roller Derby Final.mov
Format: MPEG-4
Format profile: QuickTime
Codec ID: qt
File size: 137 MiB
Duration: 2mn 22s
Overall bit rate: 8 047 Kbps
Encoded date: UTC 2011-04-20 20:28:36
Tagged date: UTC 2011-04-20 20:28:38
Writing library: Apple QuickTime

Video
ID: 2
Format: AVC
Format/Info: Advanced Video Codec
Format profile: Main@L3.2
Format settings, CABAC: No
Format settings, ReFrames: 2 frames
Codec ID: avc1
Codec ID/Info: Advanced Video Coding
Duration: 2mn 22s
Bit rate mode: Variable
Bit rate: 7 911 Kbps
Width: 1 248 pixels
Original width: 1 280 pixels
Height: 702 pixels
Original height: 720 pixels
Display aspect ratio: 16:9
Frame rate mode: Constant
Frame rate: 59.940 fps
Color space: YUV
Chroma subsampling: 4:2:0
Bit depth: 8 bits
Scan type: Progressive
Bits/(Pixel*Frame): 0.151
Stream size: 134 MiB (98%)
Language: English
Encoded date: UTC 2011-04-20 20:28:31
Tagged date: UTC 2011-04-20 20:28:38
Color primaries: BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics: BT.709-5, BT.1361
Matrix coefficients: BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177

Audio
ID: 1
Format: AAC
Format/Info: Advanced Audio Codec
Format profile: LC
Codec ID: 40
Duration: 2mn 22s
Bit rate mode: Constant
Bit rate]: 128 Kbps
Channel(s): 2 channels
Channel positions: Front: L R
Sampling rate: 48.0 KHz
Compression mode: Lossy
Stream size: 2.16 MiB (2%)
Language: English
Encoded date: UTC 2011-04-20 20:28:31
Tagged date: UTC 2011-04-20 20:28:38

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[Brian Darwin]

Thanks for the tip on the data rate; I tried 2kbps and the file came out really small (8mb) but the image was extremely pixely/blurry. I’ll try some other rates. For interest’s sake, how large do you think a 2.5 minute video file like this should be?

Regarding the size/pixel issue: do I just need to change the sequence setting in the browser from NTSC-CCIR 601 to square pixels? The footage isn’t anamorphic, so in terms of the size in the export options, should I select NTSC 4:3? Or go with the current option? Thanks again, much appreciated.