我需要从电影文件中提取隐藏式字幕信息，我已经尝试过ccextractor，但它似乎不起作用。
我已经捕获了一个视频流（其中带有隐藏式字幕）并保存到一个文件中，然后我运行ccextractor......但它找不到任何东西！
我的视频样本如下：
http://dl.dropbox.com/u/10244901/gsd.mpg
http://dl.dropbox.com/u/10244901/gsd_b.mpg
第一次尝试：
cvlc -I dummy v4l2:///dev/video1:width=720:height=480:norm=ntsc:standard=ntsc:pixelformat=2:aspect-ratio=4\:3:channel=0 --sout "#transcode{vcodec=mp2v}:standard{access=file,mux=dummy,dst=gsd.mpg}"
lzzz@ideiatu:~/Downloads/ccextractor.0.64/linux$ ./ccextractor gsd.mpg
CCExtractor 0.64, Carlos Fernandez Sanz, Volker Quetschke.
Teletext portions taken from Petr Kutalek's telxcc
--------------------------------------------------------------------------
Input: gsd.mpg
[Raw Mode: Broadcast] [Extract: 1] [Stream mode: Autodetect]
[Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto]
[Timing mode: Auto] [Debug: No] [Buffer input: No]
[Use pic_order_cnt_lsb for H.264: No] [Print CC decoder traces: No]
[Target format: .srt] [Encoding: Latin-1] [Delay: 0] [Trim lines: No]
[Add font color data: Yes] [Add font typesetting: Yes]
[Convert case: No] [Video-edit join: No]
[Extraction start time: not set (from start)]
[Extraction end time: not set (to end)]
[Live stream: No] [Clock frequency: 90000]
Teletext page: Autodetect]
Start credits text: [None]
Creating gsd.srt
-----------------------------------------------------------------
Opening file: gsd.mpg
File seems to be an elementary stream, enabling ES mode
Analyzing data in general mode
New video information found
[720 * 480] [AR: 02 - 4:3] [FR: 03 - 25] [progressive: yes]
133% | 01:40
Number of NAL_type_7: 0
Number of VCL_HRD: 0
Number of NAL HRD: 0
Number of jump-in-frames: 0
Number of num_unexpected_sei_length: 0
Total frames time: 00:01:41:200 (2530 frames at 25.00fps)
Min PTS: 00:00:00:000
Max PTS: 00:01:41:200
Length: 00:01:41:200
Initial GOP time: 00:00:00:000
Final GOP time: 00:01:40:800+10F
Diff. GOP length: 00:01:40:800+10F (00:01:41:133)
Done, processing time = 0 seconds
This is beta software. Report issues to cfsmp3 at gmail...
第二次尝试：
cvlc -I dummy gsd.mpg --sout "#standard{access=file,mux=ts,dst=gsd_b.mpg}"
lzzz@ideiatu:~/Downloads/ccextractor.0.64/linux$ ./ccextractor gsd_b.mpg
CCExtractor 0.64, Carlos Fernandez Sanz, Volker Quetschke.
--------------------------------------------------------------------------
Input: gsd_b.mpg
[Raw Mode: Broadcast] [Extract: 1] [Stream mode: Autodetect]
[Program : Auto ] [Hauppage mode: No] [Use MythTV code: Auto]
[Timing mode: Auto] [Debug: No] [Buffer input: No]
[Use pic_order_cnt_lsb for H.264: No] [Print CC decoder traces: No]
[Target format: .srt] [Encoding: Latin-1] [Delay: 0] [Trim lines: No]
[Add font color data: Yes] [Add font typesetting: Yes]
[Convert case: No] [Video-edit join: No]
[Extraction start time: not set (from start)]
[Extraction end time: not set (to end)]
[Live stream: No] [Clock frequency: 90000]
Teletext page: Autodetect]
Start credits text: [None]
Creating gsd_b.srt
-----------------------------------------------------------------
Opening file: gsd_b.mpg
File seems to be a transport stream, enabling TS mode
Analyzing data in general mode
Decode captions from MPEG-2 video stream [0x02] - PID: 68
New PID found: 68
New video information found
[720 * 480] [AR: 02 - 4:3] [FR: 03 - 25] [progressive: yes]
100% | 00:00
Number of NAL_type_7: 0
Number of VCL_HRD: 0
Number of NAL HRD: 0
Number of jump-in-frames: 0
Number of num_unexpected_sei_length: 0
Total frames time: 00:01:41:040 (2526 frames at 25.00fps)
Min PTS: 02:59:52:437
Max PTS: 02:59:52:677
Length: 00:00:00:240
Initial GOP time: 00:00:00:000
Final GOP time: 00:01:40:800 +6F
Diff. GOP length: 00:01:40:800 +6F (00:01:41:000)
Done, processing time = 0 seconds
This is beta software. Report issues to cfsmp3 at gmail...