B-Frames & Trellis, and more...
Lee Morgan <[email protected]> Wed, 1 Feb 2006 22:05:01 -0500
| Newsgroups | gmane.comp.video.xvid.user |
|---|---|
| Message-ID | <[email protected]> |
--===============1710259636== Content-Type: multipart/alternative; boundary=Apple-Mail-4--518971619 --Apple-Mail-4--518971619 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi I'm using XviD (via mencoder). These are my current xvid options... max_key_interval=720:max_bframes=4:qpel:gmc:quant_type=mpeg:chroma_me:ch roma_opt:hq_ac:vhq=4:bvhq=1:fixed_quant=2 Which I must say, generates a very high quality video (higher than I could get from x264 - and believe me I tried) and at (what I consider) a very small file size; roughly 500MB for a 45 min video. However I have a couple of questions... (Note: Below, "gain", "help", etc all refer to either increasing quality or decreasing file size while keeping the same quality). 1) I read that only 2 b-frames are recommended, I suppose this is because of high motion scenes - due to XviD not having adaptive B- frames? 2) If I'm using vhq=4 should / do I gain anything from also using trellis? 3) Would using lumi_mask help any? 4) How about altering bf_threshold? I realize that the best way to know is to encode some videos myself; however I'm just trying to get pointed in the "right" direction. Thanks, Lee --Apple-Mail-4--518971619 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=US-ASCII <HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; = -khtml-line-break: after-white-space; ">Hi I'm using XviD (via = mencoder).<DIV><BR class=3D"khtml-block-placeholder"></DIV><DIV>These = are my current xvid = options...</DIV><DIV>max_key_interval=3D720:max_bframes=3D4:qpel:gmc:quant= _type=3Dmpeg:chroma_me:chroma_opt:hq_ac:vhq=3D4:bvhq=3D1:fixed_quant=3D2</= DIV><DIV><BR class=3D"khtml-block-placeholder"></DIV><DIV>Which I must = say, generates a very high quality video (higher than I could get from = x264 - and believe me I tried) and at (what I consider) a very small = file size; roughly 500MB for a 45 min video.</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>However I have a couple of = questions...</DIV><DIV><SPAN class=3D"Apple-style-span">(Note: Below, = "gain", "help", etc all refer to either <I>increasing quality</I> or = <I>decreasing file size while keeping the same = quality</I>).</SPAN></DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>1) I read that only 2 = b-frames are recommended, I suppose this is because of high motion = scenes - due to XviD not having adaptive B-frames?</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>2) If I'm using vhq=3D4 = should / do I gain anything from also using trellis?</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>3) Would using lumi_mask = help any?</DIV><DIV><BR class=3D"khtml-block-placeholder"></DIV><DIV>4) = How about altering bf_threshold?</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>I realize that the best way = to know is to encode some videos myself; however I'm just trying to get = pointed in the "right" direction.</DIV><DIV><BR = class=3D"khtml-block-placeholder"></DIV><DIV>Thanks,</DIV><DIV>Lee</DIV></= BODY></HTML>= --Apple-Mail-4--518971619-- --===============1710259636== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ XviD-users mailing list [email protected] http://list.xvid.org/mailman/listinfo/xvid-users --===============1710259636==--