H.264 profile for new 5.5G Ipod?

[buzzqw]

ok now that i set properly target size everything seems fine, it transfers to ipod in itunes and plays correctly

:thanks:

but its very marginal situation and i can use manual croping/resizing
automkv woul be used for full film copy... so with "peculiar source" or already encoded file (mkv/avi/mp4...) the ar is "near" always wrong
Using the manual crop/resize is the good way!

[edit] i forgot to ask - why only one reference frame?

:o ... i was told that max 1 ref is usable... how many ref frames i can use ?

thanks again!

BHH

[migrena]

Theliel reported that even 5 shuld work, Nic reported 3 but i couldnt get more than 2, and mixed-refs also works

i think it has to do sth with the way i was encoding (batch scripts with avisynth scripts as source) because other couldnt play files with ref>2 that i encoded, a larger group of testers to verify this would be nice

i have some free time so i will test this a bit, maybe people from apple forum will do the testing form me...

[memberako]

guys, i need your help... it says "error" when i try to mux mp4 videos using megui... but when i use yamb, it works... i don't know what's wrong... i even tried installing it again but it didn't work...

Looking for job processor for job...
Processor found!


------------------------------------------------------

Starting job job1 at 6:59:27 PM
Starting preprocessing of job...
Preprocessing finished!
encoder commandline:
-add "Z:\movie video.mp4" -add "Z:\movie audio.mp4":lang=eng -new "Z:\movie.mp4" -tmp "Z:\"
Job not started. Reason: starting encoder failed with error 'Process has exited'
Processing ended at 6:59:28 PM
----------------------

Log for job job1

Cannot open destination file Z:\movie.mp4: I/O Error

----------------------
End of log for job1
-------------------------------------------------------

thanks.

[drunken_clam]

Hi first of all thanks Nic for your work on MP4Box. Is there now an option in the original MP4Box to set the UUID successfully?

What tools are also in use? Heard about Atomic Parsley and a patched ffmpeg version. Can somebody say which tool is most stable???

I need a tool for a batch process, so it must be very stable:-)

thanks

[Schrade]

I have a question about resolutions for the iPod 5.5G. Let's say you do the 640x480 @ 30FPS one... can the iPod 5.5G play a movie at 640x352 that's 16:9? What about varying resolutions below that? 480x272, etc..?

I don't own an iPod 5.5G so I can't do the tests myself.

[PlazzTT]

Just tried a video on my iPod Classic (think these are being called 6th gen?)

I used the PD-iPod 5.5G profile. It imported ok with iTunes, and the iPod shows a little screenshot of it, but it just goes back to the playlist when I try to play it.

I'll keep playing around with it, see if I can get something to play on it.

I think the 6G video capabilities are the same as the 5.5G

[drunken_clam]

hi,

i found out today that with iTunes 7.4.2 the uuid for h264 640x480 level 3 files isn't needed anymore. Can anybody else confirm this?

[Theliel]

you are right. I trying new ipod touch and no more uuid needed with latest itunes.

[sazoki]

so,
what suppose the best IPOD Profile shall to be
after the new Itunes update

[h264visa]

Does anybody have such a stream? mp4 file is okey, I can verify the profile and level using my H264Visa tool.

Or you guys can download this H264Visa.zip (http://h264visa.daydayup.info/downloads/H264Visa.zip).

[Theliel]

sazoki:

Depend your ipod:

For 5.5G -> ipod 5.5g profile work perfectly. IMHO you can tweak some others parameters, like deblocking, analyses... or change framerate up to 1.5MB

For newer ipod touch or maybe ipod classic -> 5.5 profile but framerate up to 10Mb/s and up to 6 reference frames. Of course, analyses and deblocking are supported.

[sazoki]

my ipod 5.5g
and i try the ipod 5.5g profile with u're sugesstion to change framerate and
the itunes refused it.

[Theliel]

ops. dont framerate, bitrate :P

[migrena]

@Theliel
10Mbps while apple specs states "H.264 video, up to 2.5 Mbps"?

[Theliel]

yes :) and 720*576 when apple said 640*480 :P

I'd test videos up to 8Mb in PAL and work perfectly. in really, I never have try any video up to 10Mbs, because megui always show me that with 8MB its sufficient for perfect conversion and truncate my numbers. :P

So I suppose that support all 3.0 level, that its 10Mbs

[migrena]

looks like apple devs forgot to add bitrate check to itunes. to bad they remembered about profile check :).

[Theliel]

well, i think that apple dont have any reason for cap videos. If touch support... itunes only detect and reject a higher profile and levels and cabac flags:

level_idc higher than 30
constraints_sets flags for profiles
entropy_coding_mode_flags for CABAC or CAVLC (reject CABAC)

but i dont know because apple dont said that touch support better video decoding.

[migrena]

they capped decoding capabilities in 5.xG, they added that stupid uuid restriction, so why not do something stupid again? and why official specs are not precise about video support?

about the resolution - there is pixelcount limit or limit to no more than 720x576?

ps this may be a bit off topic but is there any info about that subtitle support in new ipods?

[Ranguvar]

Just popping in, you can bypass iTunes quite easily.

1. Create a very small compatible MP4.
2. Sync with iTunes.
3. Open iPod drive in Explorer, look for the very small MP4.
4. Replace it with your own MP4. Make sure the name matches.

Make sure iTunes doesn't try to re-sync!

[Theliel]

I Belive remember that the max resolution for level 3.0 are pal aprox. Anyway, more res are refuse by iTunes.

Uuid restriction its no more present in the latest iTunes for all ipod models :)

And yes, at least touch support subtitle

[NorthPole]

@Theliel

If I understand you correctly, the Uuid restriction in the mp4 container is not needed or check by itunes/ipod.

Also, width resolution is no longer limited to 640.

So if I had a 720 x 360 - 16:9 aspect ratio, what should I resize to so that it works? Or do I even need to resize?

[Theliel]

right, sorry, its my poor English.

With the latest itunes you dont need more uuid changes. But I dont know the reason, sometimes i need (with megui) demux and remux again my mp4 for no itunes rejection.

720*360 work fine. you dont need resize nothing.

[migrena]

@Ranguvar this will work but you wont be able to ff/rev necause ipods database still uses that "small clip" running time.

i think im stuck wit the -ipod switch because im working on win2k and i have no desire to buy new pc (for vista) or dying os (xp). not much of a inconvinience but still - nice move, apple. :/

that "closed captionis" option is in nano3g, classic6g and iphone too. but i havent seen a file that is making any use of this. im not buying movies from itms so maybe thats the reason. is there any sample with subtitles avilable anywhere?

[NorthPole]

yes :) and 720*576 when apple said 640*480 :P

I'd test videos up to 8Mb in PAL and work perfectly. in really, I never have try any video up to 10Mbs, because megui always show me that with 8MB its sufficient for perfect conversion and truncate my numbers. :P

So I suppose that support all 3.0 level, that its 10Mbs

Per your success with the above video resolution with itunes/ipod and the chart that is reference in this thread:

http://forum.doom9.org/showthread.php?p=678891#post678891

I'm wondering if you can go to a resolution of 864 x 480 with baseline@3.0 and still have it work with a 5.5+ gen iPod?

PAL
720 * 576 = 414720 samples (or pixels)

with a framerate of 25fps total would give a total of 10 338 000 max samples per sec

NTSC
864 * 480 = 414720 samples (or pixels)

with a framerate of 23.976fps would give a total of 9 943 337 max samples per sec