我正在尝试从 iTunes 转码 m4v 文件，以便在 Windows 或 XBox 上播放它。我正在从 Windows 运行 ffmpeg。我需要指定一些 -vcodec 还是需要安装某些东西？这是我正在运行的命令和我收到的错误。
编辑：完成输出
ffmpeg version N-60393-g9707b53 Copyright (c) 2000-2014 the FFmpeg developers
built on Feb 6 2014 22:07:13 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --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 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 63.101 / 52. 63.101
libavcodec 55. 49.101 / 55. 49.101
libavformat 55. 30.100 / 55. 30.100
libavdevice 55. 7.100 / 55. 7.100
libavfilter 4. 1.102 / 4. 1.102
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] stream 0, timescale not set
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Stream #3: not enough frames to estimate rate; consider increasing probesize
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Stream #4: not enough frames to estimate rate; consider increasing probesize
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 1 (Video: none (drmi / 0x696D7264), 960x718, 3957 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 2 (Audio: none (drms / 0x736D7264), 48000 Hz, 5.1(side), 384 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 3 (Subtitle: none (p608 / 0x38303670), 1280x718, 0 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Y:02 The Empty Hearse (HD).m4v':
Metadata:
major_brand : M4V
minor_version : 0
compatible_brands: M4V mp42isom
creation_time : 2014-01-13 18:51:33
title : [...]
artist : [...]
album : [...]
genre : Drama
track : 2/8
disc : 1/1
date : 2014-01-19T08:00:00Z
description : [...]
hd_video : 1
network : PBS
show : Sherlock
episode_id : 1
season_number : 3
episode_sort : 2
media_type : 10
synopsis : [...]
Duration: 01:26:28.70, start: 0.000000, bitrate: 4505 kb/s
Stream #0:0(eng): Audio: aac (drms / 0x736D7264), 48000 Hz, stereo, fltp, 156 kb/s (default)
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Sound Media Handler
Stream #0:1(eng): Video: none (drmi / 0x696D7264), 960x718, 3957 kb/s, SAR 4:3 DAR 640:359, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Video Media Handler
Stream #0:2(eng): Audio: none (drms / 0x736D7264), 48000 Hz, 5.1(side), 384 kb/s
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Sound Media Handler
Stream #0:3(eng): Subtitle: none (p608 / 0x38303670), 1280x718, 0 kb/s (default)
Metadata:
creation_time : 2014-01-13 18:51:33
handler_name : Apple Closed Caption Media Handler
Stream #0:4: Video: mjpeg, yuvj444p(pc), 640x640 [SAR 300:300 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
File 'Sherlock.wmv' already exists. Overwrite ? [y/N] [buffer @ 0000000005fc5760] Unable to parse option value "-1" as pixel format
Last message repeated 1 times
[buffer @ 0000000005fc5760] Error setting option pix_fmt to value -1.
[graph 0 input from stream 0:1 @ 00000000027d7da0] Error applying options to the filter.
Error opening filters!