[FFmpeg-user] ffmpeg choses variable framerate for 1080p video only

[Kosta Vlotis]

On Fri, Sep 14, 2012 at 4:48 PM, Kosta Vlotis <kosta.brazzers at gmail.com> wrote:
> On Fri, Sep 14, 2012 at 1:31 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>> Kosta Vlotis <kosta.brazzers <at> gmail.com> writes:
>>
>>> ffmpeg ...
>>
>>> ".\output\%root_folder_name%\vids\hd\%1_1080p_12000_no_outro.mp4"
>>
>> Please note that ffmpeg does not support outputting VFR
>> in mp4 since November 2010.
>> (All mp4 files produced by FFmpeg since November 2010 are CFR).
>>
>> Carl Eugen
>>
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> that's great!... so how is this happening? i can assure you that i am
> getting VFR (for 1080p only) from the latest version of ffmpeg found
> here: http://ffmpeg.zeranoe.com/builds/

i have attached the mediainfo output:


General
Complete name                    : movie.mp4
Format                           : MPEG-4
Format profile                   : Base Media
Codec ID                         : isom
File size                        : 2.56 GiB
Duration                         : 29mn 2s
Overall bit rate                 : 12.6 Mbps
Encoded date                     : UTC 2012-09-13 21:58:52
Tagged date                      : UTC 2012-09-13 21:58:52

Video
ID                               : 1
Format                           : AVC
Format/Info                      : Advanced Video Codec
Format profile                   : High at L4.1
Format settings, CABAC           : Yes
Format settings, ReFrames        : 5 frames
Format settings, GOP             : M=2, N=32
Codec ID                         : avc1
Codec ID/Info                    : Advanced Video Coding
Duration                         : 29mn 2s
Bit rate mode                    : Variable
Bit rate                         : 12.0 Mbps
Width                            : 1 920 pixels
Height                           : 1 080 pixels
Display aspect ratio             : 16:9
Frame rate mode                  : Variable
Frame rate                       : 29.970 fps
Minimum frame rate               : 29.970 fps
Maximum frame rate               : 30.030 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bit depth                        : 8 bits
Scan type                        : Progressive
Bits/(Pixel*Frame)               : 0.193
Stream size                      : 2.43 GiB (95%)
Writing library                  : x264 core 125 r2208 d9d2288
Encoding settings                : cabac=1 / ref=5 / deblock=1:0:0 /
analyse=0x3:0x113 / me=umh / subme=8 / 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=12 /
lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 /
interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 /
b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0
/ weightp=2 / keyint=60 / keyint_min=6 / scenecut=40 / intra_refresh=0
/ rc_lookahead=50 / rc=abr / mbtree=1 / bitrate=12000 / ratetol=1.0 /
qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Tagged date                      : UTC 2012-09-14 05:24:43

Audio
ID                               : 2
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format version                   : Version 4
Format profile                   : LC
Codec ID                         : 40
Duration                         : 29mn 2s
Bit rate mode                    : Constant
Bit rate                         : 128 Kbps
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 48.0 KHz
Stream size                      : 26.6 MiB (1%)
Tagged date                      : UTC 2012-09-14 05:24:43