View Full Version : What about enhanced mpeg4 profiles?
I know, the O2 officially only supports MPEG4 SP, but has anyone ever tried to use standard resolution material, encoded with b-frames, qpel and GMC? I'm wondering, because it (supposedly) has the power to play content with a resolution of 1.280 x 720, so why shouldn't it have enough juice to play standard (PAL) (or below) resolution Xvid with b-frames etc. So basically this is an equivalent thread to http://iaudiophile.net/forums/showthread.php?t=19811 - only for the O2...
Maybe someone would be willing to try it? I transcoded a short clip (Dolby Digital Trailer - I guess since they are available for free download everywhere it will be ok to use them here - please correct me if I'm wrong!) with several different settings. The first part of the clip has very high Bitrates (due to the steam), but relative slow movement, the second part has high movement, but a lower bitrate - it might be easier to spot missing frames here.
Xvid with qpel, GMC and bframes (http://www.projectxenocide.com/public/CTD/Mad/O2Test_xvid_allopt.mkv)
Xvid with b-frames (http://www.projectxenocide.com/public/CTD/Mad/O2Test_xvid_b-frames.mkv)
xvid with b-frames and GMC (http://www.projectxenocide.com/public/CTD/Mad/O2Test_xvid_b-frames_gmc.mkv)
Xvid with GMC (http://www.projectxenocide.com/public/CTD/Mad/O2Test_xvid_gmc.mkv)
Xvid with GMC and q-pel (http://www.projectxenocide.com/public/CTD/Mad/O2Test_xvid_gmc_qpel.mkv)
ahah, now u r cooking with gas. On the thread you referred to it seems they settled that it does work on the A3 so it should work on the O2 but I'll make sure to check and make sure.
Well, the A3 is supposed to be able to handle more than Xvid SP, the O2 is not. Let me know if you need files coded with different options, resolutions, codecs or in a different container.
Thanks for checking!
Sorry for taking so long. I could not download the second video but I tried all the other ones and they work perfectly, with sound in-sync and no skipping whatsoever.
Sounds great. Thank you.
I fixed the link to the second video, if anybody is interested.
I tried the second one too now. No discernible problem with playback.
Ok, so we can summarize: the O2 has no problem whatsoever with
a) *.mkv's in general
b) Xvid ASP@L5 (b-frames, GMC, q-pel) in full PAL resolution
Thanks for testing!
I've been using Handbrake and I've been encoding vids to standard MP4 with either FFmpeg or Xvid, I don't use a .avi container because I want to play these files on my Apple TV and on the o2. Handbrake encodes using Simple@L1 and it does not allow for tweaking those encoder specs only x264 advance specs. Is there any other encoder that allows access to the higher functions and will encode to a .mp4 wrapper?
Not sure if this is the right thread for your question, anyway, I don't know an encoder program/frontend that does wrap your encodes into MP4 and allows you to make configure the encoder with all options (e.g. SUPER does wrap into MP4, but is IMHO as limited as Handbrake).
However, I would suggest you encode with a frontend that wraps your material into avi and then convert to MP4 with a third party tool, e.g. with this: http://leawo.com/video-converter/free-mp4converter.html (Windows) or http://leawo.com/free-mac-video-converter/ (Mac), or you wrap into mkv and convert like described here: http://forums.macrumors.com/showthread.php?t=301017, although I think this is far more difficult.
For encoding I personally still favour Gordian knot (http://www.doom9.org/index.html?/software.htm), especially if you are using Xvid or DivX. GK allows you to directly access the frontend provided by the codec programmers, so you can configure pretty much anything.
Hope this helps.
Radeonic
04-10-2009, 14:27
I would recommend using mediacoder, which is very powerful AND open source (so free). Like you I got an O2 a week ago and was looking around for good converters to convert my h264 and flv videos into something more playable for my O2. After trying several converters, I find MediaCoder very powerful and very customizible for basically any wrappers and codecs.
http://mediacoder.sourceforge.net/
It is quite hard to use at first though, but it does allow you to encode in almost any wrapper you can think of with any codecs, including their advance settings. The only hard part is find the right combination that works. But once it's working right, the program is extremely fast (especially if you have a C2D or above) and very convenient to use.
GOM encoder is a great choice...i just posted this in the S9 forum...but GOM supports most everything but only converts to divx xvid and a couple others...however, it supports variable bitrate, so there is no guess work on which bitrate you should choose...just a 0-100 percent quality slider...also it supports enhanced features such as deblocking, or sharpening...which is excellent for blurry videos...like tv rips
the only problem...is that if you have more than one audio track...itll by default choose the first one...but if you have subtitles it will hardcode them into the video if you so choose.
GOM encoder is a great choice...i just posted this in the S9 forum...but GOM supports most everything but only converts to divx xvid and a couple others...however, it supports variable bitrate, so there is no guess work on which bitrate you should choose...just a 0-100 percent quality slider...also it supports enhanced features such as deblocking, or sharpening...which is excellent for blurry videos...like tv rips
the only problem...is that if you have more than one audio track...itll by default choose the first one...but if you have subtitles it will hardcode them into the video if you so choose.
Gom ia great for tv ahows only thing it lacks for movies is a lack of keeping the AC3 soundtrack...
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