[MEncoder-users] "requested bitrate is too low." in 2-pass x264 encoding

[Grozdan]

On Sat, Apr 10, 2010 at 6:12 AM, Laine Lee <llee040 at sbcglobal.net> wrote:
> On 4/9/10 8:38 AM, "Stroller" <stroller at stellar.eclipse.co.uk> wrote:
>
>> Hi and sorry to bother you, but what's the supported method to convert
>> (say a DVD) to x264 .mp4 then, please?
>>
>> This should be done entirely in ffmpeg?
>>
>> Stroller.
>
> Hi Stroller,
>
> I'm not sure I understand why MP4Box is being promoted for this, although it
> is an excellent software solution, of course. Just a couple of weeks ago a
> method was discussed here for making iPod compatible .mp4 files that didn't
> require it (MP4Box). Tonight I tried the following with today's SVN for x264
> and mplayer on the main track from one of the family's DVD collection, and
> the results look good to me. This particular conversion command creates
> files that are compatible for TV playback from an iPod Touch 2nd generation.
> They don't appear to be avi files. If its output doesn't exemplify the
> characteristics you specified, maybe you or someone else would care to
> explain.
>
> mencoder -dvd-device /dev/rdisk4 dvd://01 -o outputfile.mp4 -vf
> scale=720:-10,harddup -ofps 24000/1001 -of lavf -lavfopts format=ipod -alang
> en -oac faac -faacopts br=192:mpeg=4:object=2:raw -ovc x264 -x264encopts
> bitrate=1500:nocabac:level_idc=30:bframes=0:global_header:threads=auto:subq=
> 5:partitions=all:trellis=1:chroma_me:me=umh:weightp=0:8x8dct=0:force_cfr

As i said it for the second time (and as RC said it too), if you use
b-frames (which obviously you don't) it will create a broken mp4.
Without b-frames it's possible to create a valid mp4 but if you throw
them in, forget it

>
> It's probably of no consequence to you, but I'll add that I performed the
> operation on a Mac OS X 10.6.3 system. I used Disk Utility to determine the
> device containing the DVD, and I used scandvd from Undvd to determine which
> track to convert. I've made available some details for getting the necessary
> software installed for a recent Mac OS X system here:
>
> http://lonestar.utsa.edu/llee/HDTV_to_DVD.html
>
> Here's some related information:
>
> http://lonestar.utsa.edu/llee/applescript/MEncoder_Droplets.html
>
> Laine Lee
>
>
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