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

[Kosta Vlotis]

On Fri, Sep 14, 2012 at 4:53 PM, Kosta Vlotis <kosta.brazzers at gmail.com> wrote:
> 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


i have a suspicion that mp4box is causing my issues. i'm using the
-cat option to join to CFR videos together but the result is coming
out as VFR.