[Mp4-tech] "blocky" shown while playing .mp4 file

[John Lam]

Hi all,
I've mpeg4 visual stream conformed to ISO/IEC 14496-2 simple profile,
its resolution is QVGA and bit rate is about 950kbps. I constructed .mp4
file header for this visual stream, then I can play it using QuickTime
6.3 and RealOne player. However, I find that there is "blocky" effect
for some instances while playing it in both QuickTime and RealOne
player. I wonder if it is caused by my out-dated computer configuration
or something else. Does anyone has clue on it? I can send the file to
you to view the actual "blocky" effect. Does anyone know what is the
computer configuration requirement for playing such visual stream by
QuickTime or RealOne player? Thank you!
My computer config:
1. Pentium III 500MHz
2. 128MB SDRAM
3. SCSI hard disk with 150MB free space.
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Best Regards,
John Lam