Video conversion bit rate mismatch??

[socrates]

Hi,

I convert my mp4 movies such as this

General
Complete name : E:\XXXXXXXX.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 1.80 GiB
Duration : 1h 29mn
Overall bit rate mode : Variable
Overall bit rate : 2 888 Kbps
Movie name : XXXXXXXXXX
Encoded date : UTC 2014-06-26 19:20:07
Tagged date : UTC 2014-06-26 20:49:07
Writing application : HandBrake rev0 2013051899

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 8 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1h 29mn
Bit rate mode : Variable
Bit rate : 2 500 Kbps
Width : 1 280 pixels
Height : 544 pixels
Display aspect ratio : 2.35:1
Frame rate mode : Variable
Frame rate : 23.976 fps
Minimum frame rate : 23.810 fps
Maximum frame rate : 1 000.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.150
Stream size : 1.55 GiB (87%)
Writing library : x264 core 130 r2273 b3065e6
Encoding settings : cabac=1 / ref=9 / deblock=1:-3:-3 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-3 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=9 / b_pyramid=1 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=2500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Encoded date : UTC 2014-06-26 19:20:07
Tagged date : UTC 2014-06-26 20:49:07
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 1h 29mn
Bit rate mode : Variable
Bit rate : 384 Kbps
Maximum bit rate : 661 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Compression mode : Lossy
Delay relative to video : 83ms
Stream size : 244 MiB (13%)
Language : English
Encoded date : UTC 2014-06-26 19:20:07
Tagged date : UTC 2014-06-26 20:49:07

Here it says that bitrate mode is variable

My converted file, via TEncoder is

[COLOR="rgb(139, 0, 0)"]
General
Complete name : E:\YYYYYYY.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 1.80 GiB
Duration : 1h 29mn
Overall bit rate : 2 889 Kbps
Movie name : YYYYYYYYY
Writing application : Lavf55.37.102

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 8 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1h 29mn
Bit rate : 2 500 Kbps
Width : 1 280 pixels
Height : 544 pixels
Display aspect ratio : 2.35:1
Frame rate mode : Variable
Frame rate : 23.976 fps
Minimum frame rate : 23.810 fps
Maximum frame rate : 24.390 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.150
Stream size : 1.55 GiB (87%)
Writing library : x264 core 130 r2273 b3065e6
Encoding settings : cabac=1 / ref=9 / deblock=1:-3:-3 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-3 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=9 / b_pyramid=1 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=2500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : ac-3
Duration : 1h 29mn
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : 83ms
Stream size : 245 MiB (13%)
Language : English[/COLOR]

My question is, I convert just the audio and leave the video are "copy source". The resultant file doesnot mention variable bitrate, so, did I lose the variable mode to constant mode? Is there any way to retain variable bitrate mode? If the question appears noobish, please don't be sarcastic....

Thanks in advance

[manono]

The resultant file doesnot mention variable bitrate, so, did I lose the variable mode to constant mode? Is there any way to retain variable bitrate mode?

For the AC3 audio? No, but you might get better sounding audio by making it 448 Kbps if that's an option.

[socrates]

Thanks Manono...thats good assurance. I was asking for the video part...

[manono]

I was asking for the video part...

For the video part? That's why I answered about the audio - because both videos already show as VBR.

[Detmek]

No, you didn't. Just because MediaInfo does not report it it doesn't mean your video is CBR. After all, you just copied video part.

Also, x264 does not realy support CBR mode, only ABR and VBR.