我在使用最新版本的 ffmpeg (2.1) 纵向录制视频时遇到问题。这在以前的版本中运行良好，但我需要最新版本来解决不同的问题。
我正在尝试拍摄任何通过的视频，并将其设为 852 宽 x 480 高。在转换宽然后高的视频时它工作正常，但是当视频高然后宽时它会破坏视频。它实际上在顶部和底部添加了一个信箱，而不是左右。此外，元数据将其显示为正确的高度和宽度，但在 Windows 中播放时它是错误的。
这是我正在使用的参数。
ffmpeg -i INPUT -s 852x480 -r 30 -aspect 1.775 -b:v 2000000 -vcodec mpeg4 -vf "scale=iw*min(852/iw\,480 /ih):ih*min(852/iw\,480 /ih),pad=852:480 :(852-iw)/2:(480 -ih)/2" -ac 2 -b:a 128k -ar 44100 -y OUTPUT
控制台输出 ffmpeg -i INPUT -r 30 -b:v 2000000 -vcodec mpeg4 -vf "scale=852:480" -ac 2 -b:a 128k -ar 44100 -y OUTPUT：
C:\Lib>ffmpeg -i "d\ca96cd13-2995-4794-b753-22be3b918659.mov" -r 30 -b:v 2000000 -vcodec mpeg4 -vf "
scale=852:480" -ac 2 -b:a 128k -ar 44100 -y "d\portx.mp4"
ffmpeg version N-58015-g8cdf4e0 Copyright (c) 2000-2013 the FFmpeg developers
built on Nov 10 2013 18:04:45 with gcc 4.8.2 (GCC)
configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32thread
s --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-icon
v --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-
libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr -
-enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --
enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enab
le-libxavs --enable-libxvid --enable-zlib
libavutil 52. 52.100 / 52. 52.100
libavcodec 55. 41.100 / 55. 41.100
libavformat 55. 21.100 / 55. 21.100
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.102 / 3. 90.102
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'd\ca96cd13-2995-4794-b753-22be3b918659.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2013-11-12 15:02:21
model : iPhone 5
model-eng : iPhone 5
encoder : 7.0.2
encoder-eng : 7.0.2
date : 2013-11-12T10:02:21-0500
date-eng : 2013-11-12T10:02:21-0500
make : Apple
make-eng : Apple
Duration: 00:00:15.48, start: 0.000000, bitrate: 780 kb/s
Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 480x360, 7
05 kb/s, 29.98 fps, 30 tbr, 600 tbn, 1200 tbc (default)
Metadata:
rotate : 90
creation_time : 2013-11-12 15:02:21
handler_name : Core Media Data Handler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 62 kb/s (default)
Metadata:
creation_time : 2013-11-12 15:02:21
handler_name : Core Media Data Handler
Output #0, mp4, to 'd\portx.mp4':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
make-eng : Apple
model : iPhone 5
model-eng : iPhone 5
make : Apple
encoder-eng : 7.0.2
date : 2013-11-12T10:02:21-0500
date-eng : 2013-11-12T10:02:21-0500
encoder : Lavf55.21.100
Stream #0:0(und): Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 852x480, q=2-31, 2000 kb/s, 15360
tbn, 30 tbc (default)
Metadata:
rotate : 90
creation_time : 2013-11-12 15:02:21
handler_name : Core Media Data Handler
Stream #0:1(und): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128
kb/s (default)
Metadata:
creation_time : 2013-11-12 15:02:21
handler_name : Core Media Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mpeg4)
Stream #0:1 -> #0:1 (aac -> libvo_aacenc)
Press [q] to stop, [?] for help
frame= 465 fps=417 q=3.8 Lsize= 4118kB time=00:00:15.52 bitrate=2173.3kbits/s
video:3860kB audio:243kB subtitle:0 global headers:0kB muxing overhead 0.348231%