NaN
13th May 2005, 19:46
Hi!
Since the question what plays and what not on standalones seems to pop up quite often in the last days I post the results of my tests so far. Might be of interest since the Mediatek-chipset series offers afaik the greatest mpeg4 power today and is used in a large percentage of high quality dvd-players.
Player: Pioneer Mediatek 1389FE (?) based, latest firmware
testclip: always the same 1min clip, action scene with various scene changes, stills, low motion scenes at a bitrate of roughly 2.8MBit/s average; 2pass.
custom quantization matrices:
Seem not to be working at all. MPEG std works great, h.263 too; Sharptooths v3-series (Ultralow,low, high, ultra high bitrates), Dideé's 6of9, ReferenceDivx' hvs-series produces artefacts like sky blocking and colour artefacts (seems to be an intra-matrix problem though).
Note that some of these matrices only have coefficients larger than 16 (intra matrix) (and do cause mentioned problems).
Bitrates:
ASP@L5 (so 9MBit/s max bitrate) works nicely. Up to now I cannot see a need for a mediatek 6000 profile; I tried ASP@L4 (4MBit/s max bitrate) with cqms too, no changes.
QPel: works
GMC:
Divx GMC with 1 warp-point is said to be no problem (I didn't test that); Xvid's 3 warp-point GMC causes heaviest stuttering (or shall I say changing stills are displayed?)
B-Frames:
Didn't test B-frames so far. 1 is said to be ok.
packed bitstream:
works. Audio switching (when there are multiple tracks of course) leads to complete loss of audio. Fast forward/backward impossible.
subtitles:
.ssr, .sub, .idx work flawlessly
If you have questions, just let me know.
Cheers, NaN
PS: len0x: I would really recommend turning off packed bitstream. Further I would suggest removing the "2GB size (max for dvdr)" entry, since the UDF filesystem allows >4GB files (UDF 1.02 is mandatory for DVD-compatibility).
Since the question what plays and what not on standalones seems to pop up quite often in the last days I post the results of my tests so far. Might be of interest since the Mediatek-chipset series offers afaik the greatest mpeg4 power today and is used in a large percentage of high quality dvd-players.
Player: Pioneer Mediatek 1389FE (?) based, latest firmware
testclip: always the same 1min clip, action scene with various scene changes, stills, low motion scenes at a bitrate of roughly 2.8MBit/s average; 2pass.
custom quantization matrices:
Seem not to be working at all. MPEG std works great, h.263 too; Sharptooths v3-series (Ultralow,low, high, ultra high bitrates), Dideé's 6of9, ReferenceDivx' hvs-series produces artefacts like sky blocking and colour artefacts (seems to be an intra-matrix problem though).
Note that some of these matrices only have coefficients larger than 16 (intra matrix) (and do cause mentioned problems).
Bitrates:
ASP@L5 (so 9MBit/s max bitrate) works nicely. Up to now I cannot see a need for a mediatek 6000 profile; I tried ASP@L4 (4MBit/s max bitrate) with cqms too, no changes.
QPel: works
GMC:
Divx GMC with 1 warp-point is said to be no problem (I didn't test that); Xvid's 3 warp-point GMC causes heaviest stuttering (or shall I say changing stills are displayed?)
B-Frames:
Didn't test B-frames so far. 1 is said to be ok.
packed bitstream:
works. Audio switching (when there are multiple tracks of course) leads to complete loss of audio. Fast forward/backward impossible.
subtitles:
.ssr, .sub, .idx work flawlessly
If you have questions, just let me know.
Cheers, NaN
PS: len0x: I would really recommend turning off packed bitstream. Further I would suggest removing the "2GB size (max for dvdr)" entry, since the UDF filesystem allows >4GB files (UDF 1.02 is mandatory for DVD-compatibility).