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

[Grozdan]

On Fri, Apr 9, 2010 at 3:48 PM, Grozdan <neutrino8 at gmail.com> wrote:
> On Fri, Apr 9, 2010 at 3:38 PM, Stroller <stroller at stellar.eclipse.co.uk> wrote:
>>
>> On 8 Apr 2010, at 17:34, Grozdan wrote:
>>>
>>> ... beware that mencoder is broken
>>> outputting to anything but AVI, MPEG PS and RAW. I guess with lavf and
>>> mp4 encoding WITHOUT b-frames, it'll do just fine but the moment you
>>> add b-frames to your encode (and you're adding them since by default
>>> they are enabled) it'll create a broken mp4
>>
>> 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?
>
> If you want to use mencoder, then you only have 2 options
>
> 1) output to an AVI and then use something like MP4Box from gpac to
> demux the AVI and mux it into an MP4, which is done like this
>
> MP4Box -aviraw video yourfile.avi
> MP4Box -aviraw audio yourfile.avi
>
> if the audio is AAC, MP4Box will dump it as .raw extension so you have
> to rename it to carry the .aac or .m4a extension or else MP4Box won't
> take it (I know, it's stupid). Then to mux into an mp4, do as
> follows...
>
> MP4Box -add video.h264 -add audio.aac -new -mpeg4 output.mp4

Oh, I almost forgot. Make sure to pass the correct FPT to MP4Box as it
always uses 25 by default. So if your video has a different FPS, then
add the -fps switch to MP4Box with the correct FPS value, eg -fps
23.976

>
> 2) encode to raw which means separating video and audio encoding.
> Requires a bit more work and may introduce sync problems in some cases
> if you're not careful
>
> If you want to make it easy on you and don't really care if you first
> output to an AVI or to a RAW, then you can try my script (called
> h264enc, google it) which automates this process (it outputs to AVI
> first, though, later on you can choose mp4/mvk/ogm/ts...)
>
>
> And as I mentioned previously, mencoder can output a valid mp4
> provided that you don't use b-frames for encoding.
>
>>
>> Stroller.
>>
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>