[MEncoder-users] encoding video for the ipod 5g

[Grozdan]

2009/7/19 Christian Ebert <blacktrash at gmx.net>:
> * Grozdan on Sunday, July 19, 2009 at 13:10:10 +0200
>> 2009/7/19 Christian Ebert <blacktrash at gmx.net>:
>>> * Grozdan on Saturday, July 18, 2009 at 01:33:37 +0200
>>>> I've no idea why it refuses to play it. Your commands look alright to
>>>> me. I've a bunch of scripts with iPod presets, which you may try out
>>>> and see if it'll work for the g5. I don't have an iPod myself hence
>>>> can't really test here
>>>>
>>>> http://h264enc.sourceforge.net/index.html
>>>
>>> frameref=3 /might/ be a problem (ipchq). I /believe/ frameref=1
>>> is 100% safe and according to Apple's "low complexity version" of
>>> the baseline profile.
>>>
>>> It would be nice to have some reliable information on that. I let
>>> some friends test stuff I converted and it seemed to work up to
>>> frameref=5, but this might depend on the movies and, more
>>> importantly, on the iPod models they used.
>>
>> I don't think frameref=3 is the problem here or else all users from
>> MeGUI will also report problems.
>
> Good to know.
>
> I was only mentioning it because of this:
>
> $ grep '^refs' /usr/local/share/ffmpeg/libx264-ipod640.ffpreset
> refs=1

Well, this must be for older iPods. IIRC the iPhone, which doesn't
have very different video requirements compared to iPods, can use up
to 6 frame references. I will lower the frameref value for all iPod
presets to 1 and increase subq to 8 for the hq presets in next h264enc

>
> and this:
>
> http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2006-September/015930.html
>
>> As long as one sticks to baseline profile and and does not go
>> beyond frameref=3, it should work. Besides, it has worked on
>> older iPods but now it doesn't seem to work on the G5. If Apple
>> is going backwards with their ass first for their newer models,
>> they should be slapped hard. More reason why I don't touch
>> anything from them. You can test the ipchq preset though, but
>> only lower frameref to 1 and see if it'll work (save settings
>> to file and modify it, then encode from there). Also, what is
>> "low complexity version" of the baseline profile? Baseline is
>> *already* low complexity and IIRC there's no "low complexity"
>> stuff mentioned in H.264 doc for baseline profiles
>
> I know, I know, which is why I wrote it in ironic quotation
> marks.
>
> I was just curious whether there is more reliable info around.
>
> c
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