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Diffstat (limited to 'ext/dv/NOTES')
| -rw-r--r-- | ext/dv/NOTES | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/ext/dv/NOTES b/ext/dv/NOTES new file mode 100644 index 0000000..8421159 --- /dev/null +++ b/ext/dv/NOTES @@ -0,0 +1,13 @@ +Packets come from 1394 480 bytes at a time. This is not a video segment +length. This causes problems, since a packet boundary crossing a video +segment can split a video segment if we lose an iso packet. We can +recover from this, sorta, with significant changes to the parser. We have +to deal with the idea that a) some macroblocks just don't exist (we have +zero's for them) and b) when any of the 5 macroblocks doesn't exist, we +can't do pass 3. + +Since things are bitstream-based, we can deal with this, but we have to +add a layer of code that tries to save time (maybe) by not decoding things +that don't exist. Not sure how this is gonna work with the parse code +being based on video segments, and not easily splittable into +macroblock-level parsing (or is it?). |