DownloadUrlResolver.GetDownloadUrls returns 22 VideoInfo objects, but none CanExtractAudio == true...

[jphellemons]

perhaps something is changed with the audioextraction?
This worked before:

VideoInfo video = videoInfos.First(info => info.VideoType == VideoType.Mp4 && info.Resolution == 0);

and this returns null:

VideoInfo video = videoInfos.FirstOrDefault<VideoInfo>(v=> v.CanExtractAudio == true);

when the videoInfos object contains 22 items from the "DownloadUrlResolver.GetDownloadUrls"

tested it on https://www.youtube.com/watch?v=VaxFIr3GJ-8

[flagbug]

That just means that YouTube doesn't provide any more Flash videos, since it's an outdated technology

[jphellemons]

Thank you for the fast reply. But does that mean that audio extraction is not possible anymore? I used the zero resolution, download mp4 video and save as mp3 before. but that also didn't work

[flagbug]

Well, since YouTube is not splitting the video and audio tracks, you could just download them directly

[jphellemons]

Sorry to bother you again, but when I ran this:

VideoInfo video = videoInfos.Where(i => i.VideoType == VideoType.Mp4 && i.Resolution == 0).OrderByDescending(q => q.AudioBitrate).First();

my video object was not null and had 128bit audio in it. But I got this error thrown at line 68 of FlvFile.cs

throw new AudioExtractionException("Invalid input file. Impossible to extract audio track.");

as found on https://www.heyrick.co.uk/blog/index.php?diary=20160113

' FLV files begin "FLV[" which is 0x464C5601
If (WordA = &H1564C46) Then Files(FileCount).Exten = "flv"

So that also depends on flash. So perhaps remove the whole audioextraction class and flash references (readme.md) or make the audioextraction take the highest bitrate value of a 0 resolution mp4 file?

[flagbug]

@jphellemons Well, you passed in an Mp4 video, but YoutubeExtractor can only extract the audio of Flash videos, so no surprises there

[GuntaButya]

Yes, this is also a problem for me.

The code example you post to your Read Me does not work: https://github.com/flagbug/YoutubeExtractor

videoInfo.Where(info => info.CanExtractAudio).OrderByDescending(info => info.AudioBitrate).First();

Additional information: Sequence contains no elements

Perhaps a little more patience and this could be an awesome product!!!

[jphellemons]

@GuntaButya I have removed the CanExtractAudio stuff. #247 You can get the audio from the zero video resolution m4a files.

[GuntaButya]

public bool CanExtractAudio { get { return this.VideoType == VideoType.Flash; } }

Of course, if the Video is not a Flash File, this will always return false. Which is by design. So if YouTube have not served you a Flash File, then this method of Extracting audio can never happen, your *.mp4 file or what ever will never have an associated Audio File to Join at a later stage! So how can we work around this?

[GuntaButya]

IEnumerable<VideoInfo> videoInfos = DownloadUrlResolver.GetDownloadUrls(link);
VideoInfo video = videoInfos.First(info => info.VideoType == VideoType.Mp4 && info.Resolution == 360);

So, we can try changing the : info.VideoType == VideoType.Mp4 to info.VideoType == VideoType.Flash

However, this currently is giving me trouble: Additional information: System.InvalidOperationException: Sequence contains no matching element

So same problem, no Flash Files Served...

[jphellemons]

@GuntaButya it's in the pr in the updated readme.md https://github.com/jphellemons/YoutubeExtractor/blob/805926ebdb521a79439dd4c321101a2d97c20858/readme.md
You only have to rename the mp3 extension to m4a. So even the pr is not up to date ha ha :)

[GuntaButya]

Yes Sir, you have fixed the problem! This works perfectly! The ups and downs of a Library dependant on a First Party's changes I guess.

This is such an awesome Product! I use YouTube Extractor regularly! Just for the Odd download and so on.

[GuntaButya]

So the file downloaded is actually a: mp4a: MPEG-4 AAC LC and in my case: 44100Hz , mono (1/0) So this could actually be treated as a separate Video Download!

public bool CanExtractAudio { get { return this.Resolution == 0 & this.VideoType == VideoType.Mp4; } }

A small mod may be needed to make this work a bit more elegantly, like in your code. As you point out, the entire AudioDownloader Class is now obsolete. Use the VideoDownloader class instead!