有谁知道如何使用 ffmpeg 从 wtv 文件中提取字幕？我尝试了许多不同的命令。它们都不起作用。最接近的是这个
ffmpeg -i input.wtv -vn -an -codec:s:0 srt test.srt
但它在输出流 #0:0 的编码器时抱怨错误 - 可能是不正确的参数，例如 bit_rate、rate、width 或 height
那个的真实意义是什么？？
完整的控制台输出如下
ffmpeg version N-52233-gee94362 Copyright (c) 2000-2013 the FFmpeg developers
built on Apr 18 2013 02:50:33 with gcc 4.8.0 (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-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 26.100 / 52. 26.100
libavcodec 55. 2.100 / 55. 2.100
libavformat 55. 2.100 / 55. 2.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 56.103 / 3. 56.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
[wtv @ 0269bac0] truncated file
Last message repeated 3 times
[mpeg2video @ 02692f60] Invalid frame dimensions 0x0.
Last message repeated 12 times
[wtv @ 0269bac0] max_analyze_duration 5000000 reached at 5016000 microseconds
Input #0, wtv, from '16 and Pregnant- Unseen Moments_Viva_2013_04_09_19_57_00.wtv':
Metadata:
WM/MediaClassPrimaryID: db9830bd-3ab3-4fab-8a371a995f7ff74
WM/MediaClassSecondaryID: ba7f258a-62f7-47a9-b21f4651c42a000
Title : 16 and Pregnant: Unseen Moments
WM/SubTitleDescription: Dr Drew hosts a look at the exclusive moments we didn't see from the second season of 16 and Pregnant.
genre : Documentary;Reality TV
WM/OriginalReleaseTime: 0
WM/MediaCredits : ;;;
service_provider: Viva
service_name : Viva
WM/MediaOriginalChannel: 16
WM/MediaOriginalChannelSubNumber: 0
WM/MediaOriginalBroadcastDateTime: 2011-12-13T00:00:00Z
WM/MediaOriginalRunTime: 38377217299
WM/MediaIsStereo: false
WM/MediaIsRepeat: true
WM/MediaIsLive : false
WM/MediaIsTape : false
WM/MediaIsDelay : false
WM/MediaIsSubtitled: false
WM/MediaIsMovie : false
WM/MediaIsPremiere: false
WM/MediaIsFinale: false
WM/MediaIsSAP : false
WM/MediaIsSport : false
WM/Provider : MediaCenterDefault
WM/VideoClosedCaptioning: false
WM/WMRVEncodeTime: 2013-04-09 18:57:02
WM/WMRVSeriesUID: !GenericSeries!16 and Pregnant: Unseen Moments
WM/WMRVServiceID: !Generated!be3ff88ee57a4cadb0334ef3df5bc91b
WM/WMRVProgramID: !MCProgram!37282063
WM/WMRVRequestID: 0
WM/WMRVScheduleItemID: 0
WM/WMRVQuality : 0
WM/WMRVOriginalSoftPrePadding: 480
WM/WMRVOriginalSoftPostPadding: 60
WM/WMRVHardPrePadding: -300
WM/WMRVHardPostPadding: 0
WM/WMRVATSCContent: false
WM/WMRVDTVContent: true
WM/WMRVHDContent: false
Duration : 38379654765
WM/WMRVEndTime : 2013-04-09 20:01:00
WM/WMRVBitrate : 2.118481
WM/WMRVKeepUntil: 0
WM/WMRVActualSoftPrePadding: 477
WM/WMRVActualSoftPostPadding: 60
WM/WMRVContentProtected: false
WM/WMRVContentProtectedPercent: 0
WM/WMRVExpirationSpan: 9223372036854775807
WM/WMRVInBandRatingSystem: 255
WM/WMRVInBandRatingLevel: 255
WM/WMRVInBandRatingAttributes: 0
WM/WMRVWatched : true
Duration: 01:03:58.07, start: 1.509175, bitrate: 2118 kb/s
Stream #0:0[0x22](eng): Subtitle: dvb_subtitle
Stream #0:1[0x23](eng): Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, s16p, 256 kb/s
Stream #0:2[0x24]: Video: mpeg2video (Main), yuv420p, 544x576 [SAR 32:17 DAR 16:9], 25 fps, 25 tbr, 10000k tbn, 50 tbc
Stream #0:3[0x0]: Video: mjpeg, yuvj420p, 189x200 [SAR 96:96 DAR 189:200], 90k tbr, 90k tbn, 90k tbc
Metadata:
title : TV Thumbnail
File 'test.srt' already exists. Overwrite ? [y/N] Output #0, srt, to 'test.srt':
Metadata:
WM/MediaClassPrimaryID: db9830bd-3ab3-4fab-8a371a995f7ff74
WM/MediaClassSecondaryID: ba7f258a-62f7-47a9-b21f4651c42a000
Title : 16 and Pregnant: Unseen Moments
WM/SubTitleDescription: Dr Drew hosts a look at the exclusive moments we didn't see from the second season of 16 and Pregnant.
genre : Documentary;Reality TV
WM/OriginalReleaseTime: 0
WM/MediaCredits : ;;;
service_provider: Viva
service_name : Viva
WM/MediaOriginalChannel: 16
WM/MediaOriginalChannelSubNumber: 0
WM/MediaOriginalBroadcastDateTime: 2011-12-13T00:00:00Z
WM/MediaOriginalRunTime: 38377217299
WM/MediaIsStereo: false
WM/MediaIsRepeat: true
WM/MediaIsLive : false
WM/MediaIsTape : false
WM/MediaIsDelay : false
WM/MediaIsSubtitled: false
WM/MediaIsMovie : false
WM/MediaIsPremiere: false
WM/MediaIsFinale: false
WM/MediaIsSAP : false
WM/MediaIsSport : false
WM/Provider : MediaCenterDefault
WM/VideoClosedCaptioning: false
WM/WMRVEncodeTime: 2013-04-09 18:57:02
WM/WMRVSeriesUID: !GenericSeries!16 and Pregnant: Unseen Moments
WM/WMRVServiceID: !Generated!be3ff88ee57a4cadb0334ef3df5bc91b
WM/WMRVProgramID: !MCProgram!37282063
WM/WMRVRequestID: 0
WM/WMRVScheduleItemID: 0
WM/WMRVQuality : 0
WM/WMRVOriginalSoftPrePadding: 480
WM/WMRVOriginalSoftPostPadding: 60
WM/WMRVHardPrePadding: -300
WM/WMRVHardPostPadding: 0
WM/WMRVATSCContent: false
WM/WMRVDTVContent: true
WM/WMRVHDContent: false
Duration : 38379654765
WM/WMRVEndTime : 2013-04-09 20:01:00
WM/WMRVBitrate : 2.118481
WM/WMRVKeepUntil: 0
WM/WMRVActualSoftPrePadding: 477
WM/WMRVActualSoftPostPadding: 60
WM/WMRVContentProtected: false
WM/WMRVContentProtectedPercent: 0
WM/WMRVExpirationSpan: 9223372036854775807
WM/WMRVInBandRatingSystem: 255
WM/WMRVInBandRatingLevel: 255
WM/WMRVInBandRatingAttributes: 0
WM/WMRVWatched : true
Stream #0:0(eng): Subtitle: srt
Stream mapping:
Stream #0:0 -> #0:0 (dvbsub -> srt)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height