[FFmpeg-user] Changing aspect ratios

[Anatol]

640x480 ==> 4:3

Roku probably does not support anamorphic pixel.
Retranscode it to 854x480

On Tue, Jan 1, 2013 at 9:44 PM, Yan Seiner <yan at seiner.com> wrote:

> I have a bunch of movies with the aspect ratio messed up.  The container
> correctly identifies the aspect ratio, but the pixel ratio is wrong.  These
> are for playback on a Roku.
>
> Width                                    : 640 pixels
> Height                                   : 480 pixels
> Display aspect ratio                     : 16:9
>
> I tried MP4Box, but even then my Roku doesn't show them correctly.
>
> These are encoded as h264 files in an mp4 container.  What's the best way
> to re-encode them with the correct aspect ratio?
>
> Full info on the files (from mediainfo):
>
> General
> Format                                   : MPEG-4
> Format profile                           : Base Media
> Codec ID                                 : isom
> File size                                : 1.04 GiB
> Duration                                 : 1h 48mn
> Overall bit rate mode                    : Variable
> Overall bit rate                         : 1 371 Kbps
> Writing application                      : Lavf52.103.0
>
> Video
> ID                                       : 1
> Format                                   : AVC
> Format/Info                              : Advanced Video Codec
> Format profile                           : Baseline at L3.0
> Format settings, CABAC                   : No
> Format settings, ReFrames                : 5 frames
> Format settings, GOP                     : N=1
> Codec ID                                 : avc1
> Codec ID/Info                            : Advanced Video Coding
> Duration                                 : 1h 48mn
> Bit rate                                 : 1 200 Kbps
> Width                                    : 640 pixels
> Height                                   : 480 pixels
> Display aspect ratio                     : 16:9
> Frame rate mode                          : Constant
> Frame rate                               : 23.976 fps
> Color space                              : YUV
> Chroma subsampling                       : 4:2:0
> Bit depth                                : 8 bits
> Scan type                                : Progressive
> Bits/(Pixel*Frame)                       : 0.163
> Stream size                              : 937 MiB (88%)
> Writing library                          : x264 core 114
> Encoding settings                        : cabac=0 / ref=5 / deblock=1:0:0
> / analyse=0x1:0x111 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 /
> mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 /
> deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=3 /
> sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 /
> bframes=0 / weightp=0 / keyint=250 / keyint_min=25 / scenecut=40 /
> intra_refresh=0 / rc_lookahead=50 / rc=abr / mbtree=1 / bitrate=1200 /
> ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.41 /
> aq=1:1.00
>
> Audio
> ID                                       : 2
> Format                                   : AAC
> Format/Info                              : Advanced Audio Codec
> Format profile                           : LC
> Codec ID                                 : 40
> Duration                                 : 1h 48mn
> Bit rate mode                            : Variable
> Bit rate                                 : 160 Kbps
> Channel(s)                               : 2 channels
> Channel positions                        : Front: L R
> Sampling rate                            : 48.0 KHz
> Compression mode                         : Lossy
> Delay relative to video                  : 83ms
> Stream size                              : 124 MiB (12%)
>
>
>
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