With youtube-dl I was able to download quite a couple of .mp4 files. However, I have just discovered, after manually playing some of them, that they are missing movie frames in some parts while still playing audio (so a blank screen is shown), or missing audio while still playing movie frames.
Hence,(1) Why doesn't youtube-dl detect or warn against such a scenario? It looks like the movie segments and audio track were merged and .mp4 produced without any warning. Is there a way to configure youtube-dl to detect such cases and redownload the movie?(2) Otherwise, are there other ways to detect such cases programmatically? (considering that one might have thousands of such .mp4 files and may not be able to manually go thru all of them?) A solution with FFmpeg or php will be appreciated.
Fragments movie mp4 download
The cause of that is possibly youtube-dl skipped (some) fragments when it had been downloading the file, there are things you can do to prevent this if you're using terminal/command prompt, some of them are:
Using MP4 it is also possible to split a movie into multiple fragments. This has the advantage that for using DASH or HLS a player software only needs to download the fragments the viewer wants to watch. A fragmented MP4 file consists of the usual MovieBox with the TrackBoxes to signal which media streams are available. A Movie Extends Box (mvex) is used to signal that the movie is continued in the fragments.Another advantage is that fragments can be stored in different files. A fragment consists of a Movie Fragment Box (moof), which is very similar to a Movie Box (moov). It contains the information about the media streams contained in one single fragment. E.g. it contains the timestamp information for the 10 seconds of video, which are stored in the fragment. Each fragment has its own Media Data (mdat) box.
One interesting feature of MPEG-CMAF is the possibility to encode segments in so-called CMAF chunks. Such chunked encoding of the content in combination with delivering the media files using HTTP chunked transfer encoding enables lower latencies in live streaming uses cases than before.In traditional fMP4 the whole segment had to be fully downloaded until it could be played out. With chunked encoding, any completely loaded chunks of the segment can already be decoded and played out while still loading the rest of the segment. Hereby, the achievable live latency is no longer depending on the segment duration as the muxed chunks of an incomplete segment can already be loaded and played out at the client.
I want to download a streaming video. When I go to Chrome DevTools -> Network instead of a link to the mp4 video I find many links like ...hd4b.mp4/fragment-1-v1.m4s and other like ...a1.m4s for audio. There are also an initial ...hd4b.mp4/init-v1.mp4 and ...init-a1.mp4. There are too many fragments to copy them manually.
When watching ripped DVD movies, many people may encounter the following problem: We have no idea what the characters are saying when they speak their native language without subtitles. For that, is it possible to rip DVDs with subtitles they prefer?
So, this article will show you how to rip a DVD with desired internal subtitle track, with added external movie subtitles, or with translated forced subtitles on screen where a different language is being spoken.
A commercial DVD disc always has several different built-in subtitle tracks. If you bought some French, Germany, Spanish-language DVDs which are foreign movies to you, you might want to rip these DVDs to MP4, AVI, MPEG, MOV etc yet still reserving its English subtitles to help you understand the movie, at this moment you could select English subtitle track and rip the DVD.
Click the "DVD Disc" button to load the DVD movie info, this powerful DVD ripper could auto analyze and detect the right DVD main title for you. (You can also choose DVD ISO Image file or DVD folder as the input)
Choose an output video format or device profile you'd like to rip the DVD movie. WinX DVD Ripper Platinum provides you 350+ preset output profiles. For example, select ripping DVD to MP4 with subtitles.
If you don't want the whole movie to have subtitles, but just portions that require translation. You can choose the "Forced Subtitle" option. By doing so, you could disable the traditional subtitles while still preserving the subtitles that translate foreign language speaking parts periodically throughout the film to help you understand what they are saying. Check how to rip DVD with forced subtitle only here.
WinX DVD Ripper Platinum supports importing external SRT subtitles to DVD video. Therefore, even if the foreign language DVD movie do not contain any language subtitles you understand, you can download subtitles of your preferred language from a safe and reliable subtitle download site (such as opensubtitles.org). Now follow the steps below to add subtitles to the DVD video.
Simply put, subtitles are texts used to display dialogue or commentary in movies, TV shows, video games, and so on for better understanding, so as to help people who are hearing-impaired, who cannot understand the spoken language or who want to learn foreign language.
Yes, you can. As mentioned in this article, you can use WinX DVD Ripper to add subtitles to a ripped DVD movies. Besides, you can also add subtitles to a DVD when directly playing the DVD disc with DVD player 5KPlayer or VLC. And, with WinX DVD Author, it is possible to insert subtitles to DVDs you burned with MP4, MKV, AVI, etc. videos.
How to add subtitles to a DVD movie with HandBrake? This HandBrake subtitle tutorial show you how to add soft or hardcode SRT subtitles with HandBrake so that you can watch foreign language DVD movies with the caption you need.
That is intended. When the owner of the file is a Dropbox Basic user, only the first 15 minutes will stream on the Dropbox website or mobile apps (60 minutes for Plus and Professional users). To view the full file, the recipient needs to save the file to their own Dropbox account, or download and played it locally on their computer.
Adds arguments from a playlist request to URIs of fragments.This may be useful for performing client authorization at the moment ofrequesting a fragment, or when protecting an HLS stream with thengx_http_secure_link_modulemodule.
If an HLS stream is protected with thengx_http_secure_link_modulemodule, $uri should not be used in thesecure_link_md5expression because this will cause errors when requesting the fragments.Base URI should be usedinstead of $uri($hls_uri in the example):
In QuickTime terminology, the term key frames refersto something different than the animation keyframes in Photoshop.In QuickTime, key frames occur at regular intervals in the movieand are stored as complete frames. Each intermediate frame thatseparates them is compared to the previous frame, and only changed datais stored. Using key frames greatly reduces movie size and greatlyincreases the memory required to edit and render a movie. Shorterintervals between key frames enable faster seeking and reverse playback,but can significantly increase the size of the file.
Specifies how many times the file can play back on the handsetonce downloaded. Also specifies file expiration options: set thefile to expire in a number of days or enter a date. If your fileis in Mobile MP4 or EZmovie format, you can restrict distributionso that once the file is on a handset it can't be sent or copiedelsewhere.
Enables the file to download via HTTP in small pieces sothat playback can start faster and so that larger files can be playedon the handset (only the fragment, not the entire movie, must fiton the handset at one time).
Specifies the number of individual images shown every second.NTSC is generally the standard video format and is 29.97 fps. PALis a European video format that is 25 fps. The standard for filmis 24 fps. QuickTime movies are sometimes created with a slowerframe rate to reduce bandwidth and CPU requirements.
Movieswith higher frame rates display motion better, but have larger filesizes. If you choose a frame rate that's lower than the movie'scurrent frame rate, frames are deleted. If you choose a number that'shigher than the movie's current frame rate, existing frames areduplicated (not recommended, since it increases file size withoutimproving quality). In most cases, your video will look better ifyou choose a number that your source fps is exactly divisible by.For example, if your source is captured at 30 fps, choose a framerate of 10 or 15. Don't choose a rate larger than that of your sourcematerial.
Specifies an option if the movie is scaled to new pixel dimensions. Letterbox scales the source proportionally to fit into the clean aperture, adding black bars to the top and bottom or sides as necessary. Crop centers, scales, and trims to the clean aperture.
Specifies an option if the movie needs to be scaled tothe new pixel dimensions. Letterbox scales the source proportionallyto fit into the clean aperture, adding black bars to the top andbottom or sides as necessary. Crop centers, scales, and trims tothe clean aperture. Fit Within Size adjusts to the destination sizeby fitting to the longest side, scaling if necessary.
Specifies an option if the movie is scaled to a new framesize. Letterbox scales the source proportionally to fit into theclean aperture, adding black bars to the top and bottom or sidesas necessary. Crop centers, scales, and trims to the clean aperture.Fit Within Dimensions adjusts to the destination size by fittingto the longest side, scaling if necessary.
I love Microsoft for producing high-quality video content and providing it for free to everyone who needs it. Too bad most of the content is only available for streaming and not for downloading.After Ignite this year I listened to more than 140 sessions, mostly during my commute. It's the easiest way of getting most of the information, but it is a killer for my mobile data plan. Luckily, Michel de Rooij provides an awesome PowerShell script to download both the videos and the slide decks! 2ff7e9595c
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