Video downloads, but only audio, no video

[MrYossu]

Version

6.3.12

Platform

LinqPad on Windows 11

Steps to reproduce

Start LinqPad, set the language to "C# Statements", add a reference to the Nuget package and paste the following code in...

string Uri = "tllygkj0czw";
string _path = @"C:\Users\Public\Downloads";
YoutubeClient youtube = new();
Video video = await youtube.Videos.GetAsync(Uri);
Progress<double> progress = new();
progress.ProgressChanged += (_, d) => {
  Console.WriteLine($"Downloaded {d * 100:F0}%");
};
await youtube.Videos.DownloadAsync(Uri, @$"{_path}\{Clean(video.Title)}.mp4", o => o
  .SetContainer("mp4")
  .SetPreset(ConversionPreset.UltraFast)
  .SetFFmpegPath($@"{_path}\ffmpeg.exe"),
  progress
  );

static string Clean(string s) =>
  string.Join("_", s.Split(Path.GetInvalidFileNameChars(), StringSplitOptions.RemoveEmptyEntries)).TrimEnd('.');

The file that is downloaded plays fine, but you only get audio, no video.

Note that this code works fine for most videos, it's only ones by this author that give this problem (as far as I know). If you try it with other videos (such as this classic) it works fine.

Any ideas? Thanks

Details

See above

Checklist

• [X] I have looked through existing issues to make sure that this bug has not been reported before
• [X] I have provided a descriptive title for this issue
• [X] I have made sure that this bug is reproducible on the latest version of the package
• [X] I have provided all the information needed to reproduce this bug as efficiently as possible
• [ ] I have sponsored this project

[Tyrrrz]

Hi. I was not able to reproduce this. With the following code I got both audio and video:

// Arrange
var youtube = new YoutubeClient();

using var dir = TempDir.Create();
var filePath = Path.Combine(dir.Path, "video.mp4");

// Act
await youtube.Videos.DownloadAsync(
    "tllygkj0czw",
    filePath,
    o =>
        o.SetFFmpegPath(FFmpeg.FilePath)
            .SetContainer("mp4")
            .SetPreset(ConversionPreset.UltraFast)
);

// Assert
MediaFormat.IsMp4File(filePath).Should().BeTrue();

[MrYossu]

@Tyrrrz Thanks for the reply. However, I'm stuck, as your code is basically the same as mine, with just the progress indicator removed, but when I run your code, I get the same as with my code, ie audio but no video.

Any ideas? Thanks again.

[MrYossu]

By the way, I had to remove the last line as MediaFormat wasn't resolved. Didn't matter, as I checked it by playing the video, which is what's actually important.

[Tyrrrz]

That sounds weird. My only guess is that YouTube serves as different stream manifests for whatever reason. They tend to do regional-based A/B testing so it might be something like that.

Can you try to resolve the manifest and inspect the streams it provides? Using this:

https://github.com/Tyrrrz/YoutubeExplode#downloading-video-streams

[MrYossu]

@Tyrrrz Thanks for the suggestion. What exactly am I looking for in there? I don't really know much about how the YouTube stuff works.

Please clarify what info I need to look at to see what's being provided.

Thanks again

[Tyrrrz]

If you can just dump the contents of StreamManifest as JSON, it would be nice. I'll compare it to what I get locally. You might want to scrub your IP address from the URLs, or just remove the URLs completely because they are not useful for this comparison.

[MrYossu]

@Tyrrrz How is this...

{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":19530951,"kiloBytes":19073.195,"megaBytes":18.626167,"gigaBytes":0.018189617},"bitrate":{"bitsPerSecond":264572,"kiloBitsPerSecond":258.3711,"megaBitsPerSecond":0.25231552,"gigaBitsPerSecond":0.00024640188}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":22408301,"kiloBytes":21883.105,"megaBytes":21.370222,"gigaBytes":0.020869358},"bitrate":{"bitsPerSecond":303561,"kiloBitsPerSecond":296.4463,"megaBitsPerSecond":0.28949833,"gigaBitsPerSecond":0.0002827132}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":127598404,"kiloBytes":124607.81,"megaBytes":121.687325,"gigaBytes":0.11883527},"bitrate":{"bitsPerSecond":4753127,"kiloBitsPerSecond":4641.7256,"megaBitsPerSecond":4.532935,"gigaBitsPerSecond":0.0044266945}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":72878255,"kiloBytes":71170.17,"megaBytes":69.50212,"gigaBytes":0.067873165},"bitrate":{"bitsPerSecond":2788605,"kiloBitsPerSecond":2723.247,"megaBitsPerSecond":2.659421,"gigaBitsPerSecond":0.0025970908}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":32270546,"kiloBytes":31514.205,"megaBytes":30.77559,"gigaBytes":0.030054288},"bitrate":{"bitsPerSecond":1102430,"kiloBitsPerSecond":1076.5918,"megaBitsPerSecond":1.0513592,"gigaBitsPerSecond":0.001026718}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":33954609,"kiloBytes":33158.797,"megaBytes":32.381638,"gigaBytes":0.031622693},"bitrate":{"bitsPerSecond":1005292,"kiloBitsPerSecond":981.73047,"megaBitsPerSecond":0.95872116,"gigaBitsPerSecond":0.00093625113}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":27429214,"kiloBytes":26786.342,"megaBytes":26.158537,"gigaBytes":0.025545446},"bitrate":{"bitsPerSecond":717750,"kiloBitsPerSecond":700.92773,"megaBitsPerSecond":0.68449974,"gigaBitsPerSecond":0.0006684568}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":18836732,"kiloBytes":18395.246,"megaBytes":17.964108,"gigaBytes":0.017543074},"bitrate":{"bitsPerSecond":695478,"kiloBitsPerSecond":679.17773,"megaBitsPerSecond":0.6632595,"gigaBitsPerSecond":0.00064771436}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":23236899,"kiloBytes":22692.285,"megaBytes":22.160433,"gigaBytes":0.021641048},"bitrate":{"bitsPerSecond":628605,"kiloBitsPerSecond":613.8721,"megaBitsPerSecond":0.59948444,"gigaBitsPerSecond":0.000585434}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":15872988,"kiloBytes":15500.965,"megaBytes":15.137661,"gigaBytes":0.014782872},"bitrate":{"bitsPerSecond":445312,"kiloBitsPerSecond":434.875,"megaBitsPerSecond":0.42468262,"gigaBitsPerSecond":0.00041472912}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":5112007,"kiloBytes":4992.1943,"megaBytes":4.87519,"gigaBytes":0.0047609275},"bitrate":{"bitsPerSecond":217592,"kiloBitsPerSecond":212.49219,"megaBitsPerSecond":0.2075119,"gigaBitsPerSecond":0.00020264834}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":11011709,"kiloBytes":10753.622,"megaBytes":10.501584,"gigaBytes":0.010255453},"bitrate":{"bitsPerSecond":398125,"kiloBitsPerSecond":388.79395,"megaBitsPerSecond":0.3796816,"gigaBitsPerSecond":0.0003707828}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":7323937,"kiloBytes":7152.282,"megaBytes":6.9846506,"gigaBytes":0.006820948},"bitrate":{"bitsPerSecond":211049,"kiloBitsPerSecond":206.10254,"megaBitsPerSecond":0.20127201,"gigaBitsPerSecond":0.0001965547}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":3540560,"kiloBytes":3457.5781,"megaBytes":3.3765411,"gigaBytes":0.0032974035},"bitrate":{"bitsPerSecond":137350,"kiloBitsPerSecond":134.13086,"megaBitsPerSecond":0.13098717,"gigaBitsPerSecond":0.00012791716}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":7495959,"kiloBytes":7320.2725,"megaBytes":7.1487036,"gigaBytes":0.006981156},"bitrate":{"bitsPerSecond":262139,"kiloBitsPerSecond":255.99512,"megaBitsPerSecond":0.24999523,"gigaBitsPerSecond":0.00024413597}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":4663921,"kiloBytes":4554.6104,"megaBytes":4.4478617,"gigaBytes":0.004343615},"bitrate":{"bitsPerSecond":127771,"kiloBitsPerSecond":124.77637,"megaBitsPerSecond":0.12185192,"gigaBitsPerSecond":0.00011899602}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":2115995,"kiloBytes":2066.4014,"megaBytes":2.01797,"gigaBytes":0.001970674},"bitrate":{"bitsPerSecond":71380,"kiloBitsPerSecond":69.70703,"megaBitsPerSecond":0.06807327,"gigaBitsPerSecond":6.6477805E-05}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":3921409,"kiloBytes":3829.501,"megaBytes":3.739747,"gigaBytes":0.0036520967},"bitrate":{"bitsPerSecond":144970,"kiloBitsPerSecond":141.57227,"megaBitsPerSecond":0.13825417,"gigaBitsPerSecond":0.00013501383}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":2683298,"kiloBytes":2620.4082,"megaBytes":2.5589924,"gigaBytes":0.002499016},"bitrate":{"bitsPerSecond":65930,"kiloBitsPerSecond":64.384766,"megaBitsPerSecond":0.06287575,"gigaBitsPerSecond":6.14021E-05}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":1211961,"kiloBytes":1183.5557,"megaBytes":1.1558161,"gigaBytes":0.0011287266},"bitrate":{"bitsPerSecond":30023,"kiloBitsPerSecond":29.319336,"megaBitsPerSecond":0.028632164,"gigaBitsPerSecond":2.7961098E-05}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":3054518,"kiloBytes":2982.9277,"megaBytes":2.9130154,"gigaBytes":0.0028447416},"bitrate":{"bitsPerSecond":70321,"kiloBitsPerSecond":68.67285,"megaBitsPerSecond":0.06706333,"gigaBitsPerSecond":6.5491535E-05}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":2547774,"kiloBytes":2488.0605,"megaBytes":2.4297466,"gigaBytes":0.0023727994},"bitrate":{"bitsPerSecond":53243,"kiloBitsPerSecond":51.995117,"megaBitsPerSecond":0.05077648,"gigaBitsPerSecond":4.9586408E-05}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":3603036,"kiloBytes":3518.5898,"megaBytes":3.436123,"gigaBytes":0.0033555888},"bitrate":{"bitsPerSecond":50166,"kiloBitsPerSecond":48.990234,"megaBitsPerSecond":0.047842026,"gigaBitsPerSecond":4.672073E-05}}
{"container":{"name":"mp4","isAudioOnly":false},"size":{"bytes":9559707,"kiloBytes":9335.651,"megaBytes":9.116847,"gigaBytes":0.008903171},"bitrate":{"bitsPerSecond":130741,"kiloBitsPerSecond":127.67676,"megaBitsPerSecond":0.124684334,"gigaBitsPerSecond":0.000121762045}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":3762110,"kiloBytes":3673.9355,"megaBytes":3.5878277,"gigaBytes":0.003503738},"bitrate":{"bitsPerSecond":53219,"kiloBitsPerSecond":51.97168,"megaBitsPerSecond":0.050753593,"gigaBitsPerSecond":4.9564056E-05}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":4809493,"kiloBytes":4696.7705,"megaBytes":4.58669,"gigaBytes":0.0044791894},"bitrate":{"bitsPerSecond":68507,"kiloBitsPerSecond":66.90137,"megaBitsPerSecond":0.06533337,"gigaBitsPerSecond":6.3802116E-05}}
{"container":{"name":"webm","isAudioOnly":false},"size":{"bytes":8582174,"kiloBytes":8381.029,"megaBytes":8.184599,"gigaBytes":0.007992772},"bitrate":{"bitsPerSecond":123760,"kiloBitsPerSecond":120.859375,"megaBitsPerSecond":0.11802673,"gigaBitsPerSecond":0.00011526048}}

Thanks again

[Tyrrrz]

Hmm seems like it's lacking a lot of data. As an alternative, can just call ToString() on every stream info and copy-paste it here? It should probably give me enough info.

[MrYossu]

@Tyrrrz Tried ToString, but it gave even less info!

Muxed (360p | mp4)
Muxed (720p | mp4)
Video-only (1440p60 | webm)
Video-only (1440p60 | mp4)
Video-only (1080p60 | mp4)
Video-only (1080p60 | webm)
Video-only (1080p60 | mp4)
Video-only (720p60 | mp4)
Video-only (720p60 | webm)
Video-only (720p60 | mp4)
Video-only (480p | mp4)
Video-only (480p | webm)
Video-only (480p | mp4)
Video-only (360p | mp4)
Video-only (360p | webm)
Video-only (360p | mp4)
Video-only (240p | mp4)
Video-only (240p | webm)
Video-only (240p | mp4)
Video-only (144p | mp4)
Video-only (144p | webm)
Video-only (144p | mp4)
Audio-only (mp4)
Audio-only (mp4)
Audio-only (webm)
Audio-only (webm)
Audio-only (webm)

Any other suggestions? Thanks again for the help.

[Tyrrrz]

Looks fine to me. If you do a manual selection of streams, does anything change?

https://github.com/Tyrrrz/YoutubeExplode/tree/master/YoutubeExplode.Converter#manually-selecting-streams

[MrYossu]

@Tyrrrz Failed to start ffmpeg. Where do I specify the path to it? The previous code had an extension method .SetFFmpegPath("path/to/ffmpeg"), but I can't see an overload for youtube.Videos.DownloadAsync that accepts both a ConversionRequestBuilder and the options needed to set the path to ffmpeg.

Thanks again

[Tyrrrz]

await youtube.Videos.DownloadAsync(streamInfos, new ConversionRequestBuilder("video.mp4").SetFFmpegPath(FFmpeg.FilePath).Build());

[MrYossu]

@Tyrrrz Thanks, that worked fine.

Is there any disadvantage to downloading this way? The page you linked says that stream muxing is a resource-intensive process, which concerns me. The previous method has worked for all videos I've tried, except for ones from this author. Is there some way of telling if the previous method will be OK, and only switching to this method if needed?

Thanks again for all the help.

[MrYossu]

Also, can I guarantee that there will always be a stream with label "1080p60", or do I have to loop through them all and pick the best one by parsing the label?

[Tyrrrz]

@Tyrrrz Thanks, that worked fine.

Is there any disadvantage to downloading this way? The page you linked says that stream muxing is a resource-intensive process, which concerns me. The previous method has worked for all videos I've tried, except for ones from this author. Is there some way of telling if the previous method will be OK, and only switching to this method if needed?

Thanks again for all the help.

There is no inherent disadvantage because the original approach uses this under the hood: https://github.com/Tyrrrz/YoutubeExplode/blob/1b5b33edcc03c28ebcf84bb93411d15eb4e28f44/YoutubeExplode.Converter/ConversionExtensions.cs#L26-L68

When selecting streams manually, you have to account for a few different things. Reading the method implementation I linked should give more context.

I don't know why the original approach didn't work for you and I can't reproduce it. The streams you receive seem fine. If you can get a video-less output with the manual approach as well, it could provide more info. But I don't have a guess right now.

Also, can I guarantee that there will always be a stream with label "1080p60", or do I have to loop through them all and pick the best one by parsing the label?

No, you can't, that was just an example.

[MrYossu]

@Tyrrrz Thanks again.

I dumped out the VideoQuality.Label for each of the streams, and got the following...

360p
720p
1440p60
1080p60
1080p60
720p60
720p60
480p
480p
360p
360p
240p
240p
144p
144p

I tried the same code as before, but used "1440p60" to select the stream. This gave an audio-only file again. The same happened if I used GetWithHighestBitrate instead of First(s => s.VideoQuality.Label == "1080p60"), which I guess is consistent.

However, this leaves me with a problem. How do I know which stream to pick? I can't pick the highest resolution, as that fails as you can see here. Is there a way of telling which stream will give the video as well?

Any advice? Thanks again.

[Tyrrrz]

Hmm. Can you download the 1440p60 stream by itself (using youtube.Video.Streams.DownloadAsync(...)) and see if it has any video data in itself?

[MrYossu]

@Tyrrrz Tried the following...

string _path = @"C:\Users\Public\Downloads\";
var youtube = new YoutubeClient();
var videoUrl = "https://youtube.com/watch?v=tllygkj0czw";
var streamManifest = await youtube.Videos.Streams.GetManifestAsync(videoUrl);
var videoStreamInfo = streamManifest
    .GetVideoStreams()
    .Where(s => s.Container == Container.Mp4)
    .First(s => s.VideoQuality.Label == "1440p60");
await youtube.Videos.Streams.DownloadAsync(videoStreamInfo, $"{_path}video.mp4");

...but the file that was downloaded wouldn't play. Media Player gave an error "We can't open video. It's encoded in AVI format which isn't supported."

Does that help? Thanks again.

[Tyrrrz]

It really looks like YouTube just has a corrupted/broken stream for some reason.

[MrYossu]

It's odd, as it seems to happen with all of the videos from that author, but I've not noticed it with any other author.

So, I'm still left with my previous question, is there any way of telling whether a stream is going to have video or not? If I could detect that, I could choose the right stream. Otherwise I'm stuck.

Thanks again

[Tyrrrz]

What's the VideoEncoding of that stream? If you open the stream URL in the browser, can you play it? Does it return a non-zero Content-Length header?

[MrYossu]

@Tyrrrz Not exactly sure how to find the VideoEncoding or Content-Length, but the following code...

var videoStreamInfo = streamManifest
    .GetVideoStreams()
    .Where(s => s.Container == Container.Mp4)
    .First(s => s.VideoQuality.Label == "1440p60");

Console.WriteLine($"Codec: {videoStreamInfo.VideoCodec}");
Console.WriteLine($"Bit rate: {videoStreamInfo.Bitrate.ToString()}");
Console.WriteLine($"Size: {videoStreamInfo.Size.Bytes} bytes");
Console.WriteLine($"Container: {videoStreamInfo.Container.Name}");
Console.WriteLine($"Url: {videoStreamInfo.Url}");

...gave the following output...

Codec: av01.0.12M.08
Bit rate: 2.66 Mbit/s
Size: 72878255 bytes
Container: mp4
Url: https://rr5---sn-aigzrn7z.googlevideo.com/videoplayback?expire=1709096353&ei=QWneZerOCaSXhcIP8u6h8AU&ip=81.174.251.160&id=o-AHskOsEvrhb4KeMjuZX8vadBKFVUcFZinosRLNZ0Hs5x&itag=400&source=youtube&requiressl=yes&xpc=EgVo2aDSNQ%3D%3D&mh=u_&mm=31%2C26&mn=sn-aigzrn7z%2Csn-5hne6nzk&ms=au%2Conr&mv=m&mvi=5&pl=21&initcwndbps=1763750&vprv=1&mime=video%2Fmp4&gir=yes&clen=72878255&dur=590.583&lmt=1707491729003654&mt=1709074385&fvip=3&keepalive=yes&fexp=24007246&c=ANDROID_TESTSUITE&txp=5532434&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cxpc%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=AJfQdSswRQIhALe-uq9ymT39LJJphCPh5GMvo7kDpBuAya894bGKSbQvAiBY8vbQ190QtO-ZJkV4yhw4cVdlNq5F3SLlc3eCDGrwvg%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=APTiJQcwRQIgIMmMeg_TwO4TLJcsTrtK3qAW3O8SyZ4WZoIRLPy-YfMCIQCeOamYR73Nts5oydHYh7Js-r1A0nVVz36-PHAU59Zspw%3D%3D

Pasting that URL into a browser played the video without any audio.

Does that help? If not, please can you give me more precise instructions how to get the info you want.

Thanks again

[Tyrrrz]

Can you download that stream and upload it here?

[MrYossu]

@Tyrrrz Short answer - no I don't seem to be able to download it. I have tried a few ways, but all time out.

I used the URL returned by the code above (regenerated as they only last a short while), but whatever C# I try, it just times out.

I first tried this...

HttpClient client=new();
var bytes = await client.GetByteArrayAsync(url)
File.WriteAllBytes(@"C:\Users\Public\Downloads\stream.mp4", bytes);

I then tried the old method...

WebRequest r=WebRequest.Create(url);
using WebResponse res=r.GetResponse();
using Stream s=res.GetResponseStream();
string file=@"C:\Users\Public\Downloads\stream.mp4";
using var fs = new FileStream(file, FileMode.OpenOrCreate);
s.CopyTo(fs);

...but had the same time-out issue both ways. The code shown earlier downloaded the file fairly quickly, so it's not the size that's a problem.

Am I doing something wrong here? Any suggestions? Thanks again

[Tyrrrz]

What if you try to download it in your browser? You said you could get it to play there, right?

[MrYossu]

@Tyrrrz Silly me. Forgot that I could just paste the URL into a browser and download from there 😁

Too big to upload here, so I put it on my blog.

[Tyrrrz]

The stream looks actually fine so I'm not sure what's wrong then

[MrYossu]

Do you have any advice as to what I can do then? I've asked a few times if there is a way of checking a stream to see if it contains the data I need, but you've not answered that one, which makes me think it can't be done.

I really need a way of getting the full audio and video, so any advice would be appreciated.

[Tyrrrz]

Yeah, I was trying to figure out if there's anything special about that stream that could let you identify it early and skip, but it doesn't appear like it's special in any way. So I unfortunately don't have any recommendations for that.

As an interim solution, I would specifically skip this combination of video quality + video codec + container for this YouTube creator. I wish I could assist you help more but I don't have the time to investigate this further.

[MrYossu]

@Tyrrrz OK, thanks for all the help.