How to download mp4 youtube dl

Finally, create a pull request. We'll then review and merge it. This section introduces a guide lines for writing idiomatic, robust and future-proof extractor code. Extractors are very fragile by nature since they depend on the layout of the source data provided by 3rd party media hosters out of your control and this layout tends to change. As an extractor implementer your task is not only to write code that will extract media links and metadata correctly but also to minimize dependency on the source's layout and even to make the code foresee potential future changes and be ready for that.

This is important because it will allow the extractor not to break on minor layout changes thus keeping old youtube-dl versions working.

Even though this breakage issue is easily fixed by emitting a new version of youtube-dl with a fix incorporated, all the previous versions become broken in all repositories and distros' packages that may not be so prompt in fetching the update from us. Needless to say, some non rolling release distros may never receive an update at all. For extraction to work youtube-dl relies on metadata your extractor extracts and provides to youtube-dl expressed by an information dictionary or simply info dict.

Only the following meta fields in the info dict are considered mandatory for a successful extraction process by youtube-dl:. In fact only the last option is technically mandatory i. But by convention youtube-dl also treats id and title as mandatory. Thus the aforementioned metafields are the critical data that the extraction does not make any sense without and if any of them fail to be extracted then the extractor is considered completely broken.

Any field apart from the aforementioned ones are considered optional. That means that extraction should be tolerant to situations when sources for these fields can potentially be unavailable even if they are always available at the moment and future-proof in order not to break the extraction of general purpose mandatory fields.

Assume you want to extract summary and put it into the resulting info dict as description. Since description is an optional meta field you should be ready that this key may be missing from the meta dict, so that you should extract it like:. The latter will break extraction process with KeyError if summary disappears from meta at some later time but with the former approach extraction will just go ahead with description set to None which is perfectly fine remember None is equivalent to the absence of data.

On failure this code will silently continue the extraction with description set to None. That is useful for metafields that may or may not be present. When extracting metadata try to do so from multiple sources. For example if title is present in several places, try extracting from at least some of them. This makes it more future-proof in case some of the sources become unavailable. Say meta from the previous example has a title and you are about to extract it.

Since title is a mandatory meta field you should end up with something like:. If title disappears from meta in future due to some changes on the hoster's side the extraction would fail since title is mandatory. That's expected. Assume that you have some another source you can extract title from, for example og:title HTML meta of a webpage. In this case you can provide a fallback scenario:.

This code will try to extract from meta first and if it fails it will try extracting og:title from a webpage. Capturing group must be an indication that it's used somewhere in the code. Any group that is not used must be non capturing. When using regular expressions try to write them fuzzy, relaxed and flexible, skipping insignificant parts that are more likely to change, allowing both single and double quotes for quoted values and so on.

Note how you tolerate potential changes in the style attribute's value or switch from using double quotes to single for class attribute:.

There is a soft limit to keep lines of code under 80 characters long. This means it should be respected if possible and if it does not make readability and code maintenance worse. For example, you should never split long string literals like URLs or some other often copied entities over multiple lines to fit this limit:. Extracting variables is acceptable for reducing code duplication and improving readability of complex expressions.

However, you should avoid extracting variables used only once and moving them to opposite parts of the extractor file, which makes reading the linear flow difficult. Multiple fallback values can quickly become unwieldy. Collapse multiple fallback values into a single expression via a list of patterns. Use them for string to number conversions as well.

If you encounter any problems parsing its output, feel free to create a report. From a Python program, you can embed youtube-dl in a more powerful fashion, like this:. Most likely, you'll want to use various options.

For a start, if you want to intercept youtube-dl's output, set a logger object. Unless you were prompted to or there is another pertinent reason e. GitHub fails to accept the bug report , please do not send bug reports via personal email.

For discussions, join us in the IRC channel youtube-dl on freenode webchat. Please include the full output of youtube-dl when run with -v , i. It should look similar to this:. Do not post screenshots of verbose logs; only plain text is acceptable. The output including the first lines contains important debugging information.

Issues without the full output are often not reproducible and therefore do not get solved in short order, if ever. Please re-read your issue once again to avoid a couple of common mistakes you can and should use this as a checklist :. We often get issue reports that we cannot really decipher.

While in most cases we eventually get the required information after asking back multiple times, this poses an unnecessary drain on our resources. Many contributors, including myself, are also not native speakers, so we may misread some parts. So please elaborate on what feature you are requesting, or what bug you want to be fixed. Make sure that it's obvious.

If your report is shorter than two lines, it is almost certainly missing some of these, which makes it hard for us to respond to it. We're often too polite to close the issue outright, but the missing info makes misinterpretation likely. As a committer myself, I often get frustrated by these issues, since the only possible way for me to move forward on them is to ask for clarification over and over. For bug reports, this means that your report should contain the complete output of youtube-dl when called with the -v flag.

The error message you get for most bugs even says so, but you would not believe how many of our bug reports do not contain this information. If your server has multiple IPs or you suspect censorship, adding --call-home may be a good idea to get more diagnostics. Site support requests must contain an example URL. There should be an obvious video present. Except under very special circumstances, the main page of a video service e.

Before reporting any issue, type youtube-dl -U. This should report that you're up-to-date. This goes for feature requests as well. Make sure that someone has not already opened the issue you're trying to open. Search at the top of the window or browse the GitHub Issues of this repository. If there is an issue, feel free to write something along the lines of "This affects me as well, with version Here is some more information on the issue While some issues may be old, a new post into them often spurs rapid activity.

Before requesting a new feature, please have a quick peek at the list of supported options. Many feature requests are for features that actually exist already! Please, absolutely do show off your work in the issue report and detail how the existing similar options do not solve your problem.

People want to solve problems, and often think they do us a favor by breaking down their larger problems e. However, what often happens is that they break down the problem into two steps: One simple, and one impossible or extremely complicated one. Active Oldest Votes. Try using the following. Improve this answer. BeeFriedman BeeFriedman 1, 1 1 gold badge 4 4 silver badges 22 22 bronze badges.

This won't work most of the time because if webm file is downloaded, it won't merge as discussed here: github. SakibArifin this issue was fixed already in the new versions. Btw i tried it and it did save it as a. I am trying to follow up, did this solve your issue, or did it not help you at all? Unfortunately, this doesn't solve my issue. I posted pictures of what happened after I tried your solution in my forum: ict.

Try updating it. Show 1 more comment. Improve this answer. Hugh Hugh 1 1 silver badge 9 9 bronze badges. I tried this and found out that 4k mp4 video was MB while 4k webm video was 1. Which is contradicting my description that webm videos are smaller in size.

While for another p mp4 video was 80 MB in size while p webm was 62 MB which supports my description. It's weird. It's probably linked to the encoding method used for each format. This works perfectly and should be set as the correct solution.

This downloads p mp4 video. The OP wanted the best video quality possible and you're offering to reencode it? Sounds weird. Tashkinov: I don't see where op said that, OP wants 4k mp4s which you can achieve by reencoding The OP said: "Which makes me wonder that either there is some quality loss or compression in webm.

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