Question

我发现很多关于使用ffmpeg创建DVD菜单的问题，但我没有发现任何关于以编程方式访问DVD结构信息的问题。当我使用libav（或FFmpeg）库时，我可以打开DVD映像（iso文件）并访问视频，音频和字幕流。但我找不到任何API。

我可以使用VLC播放器（以及libvlc库）播放视频和查找信息。但我需要在程序上对音频和字幕流进行一些处理。我不想使用像SmartRipper这样的工具拆分VOB，然后才进行处理。

libav（ffmpeg）是否包含用于处理DVD菜单的任何API？如果没有，你能推荐任何其他库，可以用来获得有关标题（章节）开始和结束时间的信息，一帧（样本，AVPacket）准确吗？

我听说过libdvdnav库，但我不知道它是否适合我。我是libav和DVD格式内部的新手。

Answer 1

我不确定在这种情况下1帧精度意味着什么。但是，我一直在使用一个名为lsdvd的工具，这是一个基本的CLI工具，它只作为参数，DVD驱动器的块设备。（如果没有该参数，它将猜测现代Linux上缺少的/dev/dvd，并且通常是/dev/sr0。）然后它将为您提供光盘章节的精彩列表，如下所示： / p>

$ lsdvd /dev/sr0
Disc Title: METAL_DISC_2
Title: 01, Length: 00:00:00.433 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 01
Title: 02, Length: 00:00:11.500 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 00
Title: 03, Length: 00:00:00.433 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 01
Title: 04, Length: 00:00:00.433 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 01
Title: 05, Length: 00:00:09.000 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 00
Title: 06, Length: 00:00:10.000 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 00
Title: 07, Length: 00:00:00.433 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 01
Title: 08, Length: 00:25:02.333 Chapters: 06, Cells: 06, Audio streams: 01, Subpictures: 00
Title: 09, Length: 00:00:00.433 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 00
Title: 10, Length: 00:07:48.700 Chapters: 16, Cells: 16, Audio streams: 01, Subpictures: 00
Title: 11, Length: 00:00:00.433 Chapters: 01, Cells: 01, Audio streams: 01, Subpictures: 00
Title: 12, Length: 00:16:43.066 Chapters: 08, Cells: 08, Audio streams: 01, Subpictures: 00
...snip...
Longest track: 20

如果您希望编写自己的代码，我认为查看lsdvd的来源将具有指导意义。它在Fedora 25中链接的唯一库（标准内容除外）是libdvdread.so.4，它是dvdnav项目的一部分。

HTH。

Answer 2

Mplayer可以做到这一点。我不熟悉他们的图书馆，但这可以让你开始

mplayer dvd:// -identify

结果

CHAPTERS: 00:00:00.000,00:03:40.200,00:07:29.500,00:12:04.033,00:16:17.199,
00:27:36.499,00:34:26.166,00:43:37.199,00:49:29.533,00:59:46.500,01:12:47.667,
01:17:09.000,01:26:13.700,01:47:15.833,01:50:06.200,01:55:25.500,02:06:42.500,
02:13:03.666,02:20:37.499,02:28:20.832,02:33:26.832,02:37:47.532,02:43:58.665,
02:51:00.165,02:56:36.165,03:01:21.998,03:05:09.331,03:07:14.665,03:11:49.665,
03:16:35.165,

Answer 3

基本上你不能说，但你可以寻找最长的头衔。

一个选项：使用handbrakecli -scan e:（手刹的一部分）

另一个：使用mplayer -identify dvd:// -dvd-device e:（mplayer   标准）

来自：http://betterlogic.com/roger/2011/07/dvd-determine-main-title-from-command-line/

这帮助了我，因为VLC列出了其中的菜单页面中的标题和章节

基本上，安装VLC Media Player，然后在其中播放DVD。   浏览直至“正在播放真正的标题”

然后转到播放[菜单] - ＆gt;标题，看看它目前是哪一个   高亮。

现在您知道哪个标题是“主要”标题曲目。

来源：http://betterlogic.com/roger/2010/11/how-to-use-vlc-to-tell-how-many-titles-and-chapters-and-which-is-the-main/

Answer 4

我使用上述两者的组合来创建DVD章节文件，稍后我可以将mkvmerge添加到编码的mkv文件中：

#!/bin/bash
if [ $# -lt 1 ]; then
    echo "Usage: $0 filename title_no"
    exit 
fi

i=1
j2=01
filename=$1
echo "Using lsdvd to load chapter info:"
lsdvd -c ./
if [ -z "$2" ]; then
    echo -ne "What title number do you want to create chapter info for: "
    read title
else
    title=$2
fi
IFS=',' read -r -a CHAPTERS <<< `mplayer -identify -frames 0 "./VTS_0"$title"_0.IFO" 2>/dev/null | grep CHAPTERS: | sed 's/CHAPTERS: //'`

for chapter in "${CHAPTERS[@]}"
do
    echo "Chapter $i: $chapter"
    let i++
done

echo -ne "Creating chapter data file...."
sleep 3
for chapter in "${CHAPTERS[@]}"
do
    echo "CHAPTER$j2=$chapter" >> $filename.txt
    echo "CHAPTER"$j2"NAME=Chapter $j2" >> $filename.txt
    j2=$(printf %02d $((10#$j2 + 1 )))

done
echo "DONE."
echo "Chapter data file: $filename.txt"

示例输出：

$ read_chapters.sh whiteglasses_chapters
Using lsdvd to load chapter info: 
libdvdread: Couldn't find device name.
Couldn't read enough bytes for title.
Disc Title: unknown
Title: 01, Length: 00:00:21.000 Chapters: 01, Cells: 01, Audio streams: 00, Subpictures: 00
    Chapter: 01, Length: 00:00:21.000, Start Cell: 01
Title: 02, Length: 01:52:32.166 Chapters: 11, Cells: 12, Audio streams: 02, Subpictures: 01
    Chapter: 01, Length: 00:10:23.200, Start Cell: 01
    Chapter: 02, Length: 00:11:53.200, Start Cell: 02
    Chapter: 03, Length: 00:08:02.367, Start Cell: 03
    Chapter: 04, Length: 00:11:28.533, Start Cell: 04
    Chapter: 05, Length: 00:12:55.834, Start Cell: 05
    Chapter: 06, Length: 00:12:26.600, Start Cell: 06
    Chapter: 07, Length: 00:16:20.766, Start Cell: 07
    Chapter: 08, Length: 00:10:31.934, Start Cell: 09
    Chapter: 09, Length: 00:09:24.033, Start Cell: 10
    Chapter: 10, Length: 00:09:04.767, Start Cell: 11
    Chapter: 11, Length: 00:00:00.800, Start Cell: 12
    Longest track: 02
    What title number do you want to create chapter info for: 2 
    Chapter 1: 00:00:00.000
    Chapter 2: 00:10:23.200
    Chapter 3: 00:22:16.400
    Chapter 4: 00:30:18.767
    Chapter 5: 00:41:47.300
    Chapter 6: 00:54:43.134
    Chapter 7: 01:07:09.734
    Chapter 8: 01:23:30.500
    Chapter 9: 01:34:02.434
    Chapter 10: 01:43:26.467
    Chapter 11: 01:52:31.234 
    Creating chapter data file....DONE.
    Chapter data file: whiteglasses_chapters.txt

然后我就跑了：

mkvmerge --chapters chapters.txt -o output.mkv input-file.mkv

如何获取DVD中的标题和章节信息？

4 个答案: