[MEncoder-users] how do u set H264 video ID?

[Grozdan]

On Mon, Jun 28, 2010 at 12:48 AM, U. George <netbeans at gatworks.com> wrote:
>
>
> On 06/27/2010 04:51 PM, Grozdan wrote:
>>
>> No, they're correct. Original has an ID of 4113 because it's in a
>> different container than the encoded one. IDs are selected by using
>> the -vid option. Very frequently, ts/m2ts containers have high IDs in
>> contrast to avi which uses low ones
>>
>>> >  also, is there some reason why the new file has reference frames of 4,
>>> > and
>>> >  the orig has 2? I didnt see any option for either.
>>
>> This is due to default settings of x264. If you don't specify the
>> amount of reference frames with frameref in mencoder, the value is
>> picked up from the defaults of x264, and in this case it has 4
>> reference frames
>>
>>
>
> I have tried -vid, as well as :frameref=2 ( doc says default is 3 rather
> than 4 ).
> Neither one seems to influence the way the h264 file created. Vid is still
> 0, and frameref is still 4.
>
> =================================================================
> mencoder -v -v  -msglevel all=9
> /home/gat/DIESEL/TEST_FP24/PF24_10Seconds.MTS -mc 0 -noskip -fps 30000/1001
> -delay -0.222 -oac copy -vf pullup,softskip,harddup,scale=1920:1080 -ofps
> 24000/1001 -vid 4113 -ovc x264 -x264encopts
> bitrate=24000:qp=5:pass=2:nointerlaced:log=3:frameref=2 -o a.avi
> =================================================================

Your options are kinda silly. why do you use two different encoding
modes together? You use qp=5 with pass=2. Those are two different
modes - either choose the one or the other. Also, qp should never be
used. Use crf instead or pass=2

reference frames are not just influenced by the frameref option. If
you use b_pyramid, it will add an "extra" reference frame. The more
reference frames, the better but it will slow down things with high
reference frames and may make it incompatible with some devices. Also,
for live action, more than 6-8 reference frames are not really useful.
For anime though, up to 16 reference frames can be very useful


> [gat at MyLaptop mplayer]$ mediainfo a.avi
> General
> Complete name                    : a.avi
> Format                           : AVI
> Format/Info                      : Audio Video Interleave
> File size                        : 145 MiB
> Duration                         : 11s 8ms
> Overall bit rate                 : 110 Mbps
> Writing application              : MEncoder SVN-r31525-4.4.2
> Writing library                  : MPlayer
>
> Video
> ID                               : 0
> Format                           : AVC
> Format/Info                      : Advanced Video Codec
> Format profile                   : High at L4.0
> Format settings, CABAC           : Yes
> Format settings, ReFrames        : 4 frames
> Codec ID                         : h264
> Duration                         : 10s 761ms
> Bit rate                         : 113 Mbps
> Width                            : 1 920 pixels
> Height                           : 1 080 pixels
> Display aspect ratio             : 16:9
> Frame rate                       : 23.976 fps
> Color space                      : YUV
> Chroma subsampling               : 4:2:0
> Bit depth                        : 8 bits
> Scan type                        : Progressive
> Bits/(Pixel*Frame)               : 2.263
> Stream size                      : 144 MiB (100%)
> Writing library                  : x264 core 98 r1643 0cd5d69
> Encoding settings                : cabac=1 / ref=2 / deblock=1:0:0 /
> analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 /
> mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 /
> deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=1 /
> sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 /
> bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 /
> weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 /
> rc=cqp / mbtree=0 / qp=5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=0
>
>
>
>
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