youtube-api - 代码始终返回 isCC = false，即使对于带有隐藏式字幕的视频也是如此 - Apps 脚本

Question

var caption = YouTube.Captions.list("snippet", "XPpsI8mWKmg")

https://www.youtube.com/watch?v=XPpsI8mWKmg

该视频有隐藏式字幕。但是，响应始终返回 isCC = false。它也发生在更多视频中。谁能告诉我为什么？

https://developers.google.com/youtube/v3/docs/captions

这是响应:

    [15-09-14 10:46:33:634 BST] {
kind=youtube#captionListResponse,
tag="jOXstHOM20qemPbHbyzf7ztZ7rI/pWn9PuYA4wHTOuk7gWrw_wkqaMg", 
items=[{snippet={lastUpdated=2015-04-22T15:19:44.401Z, 
        trackKind=ASR, isAutoSynced=false, 
        audioTrackType=unknown,
        isDraft=false, name=, 
        isEasyReader=false, 
        isLarge=false, 
        videoId=XPpsI8mWKmg, 
        language=en, isCC=false, 
        status=serving}, 

kind=youtube#caption,                              
etag="jOXstHOM20qemPbHbyzf7ztZ7rI/5QI7PZUUbbATmyKtvzGqv9-ylR0",          
id=5dp7OTjMUTyH2tf_kEhELNI2X9MpCov20brI5R-kAw4=}, 
    {snippet={
        lastUpdated=2015-04-22T15:12:54.185Z, 
        trackKind=standard, 
        isAutoSynced=false, 
        audioTrackType=unknown, 
        isDraft=false, 
        name=, 
        isEasyReader=false, 
        isLarge=false, 
        videoId=XPpsI8mWKmg, 
        language=en, 
        isCC=false, 
        status=serving}, 
kind=youtube#caption, 
etag="jOXstHOM20qemPbHbyzf7ztZ7rI/6A1s7QwGUJ_Jp39d-tidbyPR6t4", 
id=Q-Rh5crBiivJBgQyElc_gzhB8eK8y0V4}]}

谢谢。

Answer 1

我尝试为自己的视频设置隐藏式字幕，结果相同。

我相信在播放器中，您看到的“CC”实际上是指字幕。字幕和隐藏式字幕之间存在重要区别(请参阅 here 和 here)。

Subtitles (or English Subtitles) is usually just a word-for-word translation of the dialog into English words.

...

CC usually also tells the viewer about sound effects or background noises. For example if you are watching a movie with explosions, gunfire or other sounds that are important to the plot, CC will usually display text that announces such sounds

因此，我相信 isCC 只有在包含此类字幕的视频中才为 true而不是人们可以在视频中添加的一般字幕。我认为在几乎所有情况下，只有 YouTube 上的高质量付费电影才会有这类字幕。从这个意义上讲，isCC 属性按预期方式工作。