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

[Grozdan]

On Sat, Apr 10, 2010 at 5:33 PM, Stroller
<stroller at stellar.eclipse.co.uk> wrote:
>
> On 10 Apr 2010, at 12:30, Grozdan wrote:
>>>
>>> ...
>>> I'm not sure I understand why MP4Box is being promoted for this, ...
>>>
>>> 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
>
> AIUI b-frames allow higher quality encoding per file-size. Is this correct?

yes, and are beneficial in reducing file size too. A lot of portable
players don't support it, but some do.

Also, in the above command, partitions=all, even when forced like it
is above, will NOT use all partitions. This is because 8x8dct is
disabled so the i8x8 partition won't be used as it requires 8x8dct to
be enabled. Further, trellis=1 will also NOT be used as trellis
requires cabac to be enabled, but it is disabled above

>
> Stroller.
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