MPD | Music Player Daemon | Audio Utils library
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QUESTION
I want to wrap the shaka-player
example in an AngularJS directive.
The example player works fine on its own and can play the MPEG-DASH version of Big Buck Bunny hosted on Akamai's CDN.
However, when trying to use shaka-player
within an AngularJS directive, player.load(url)
fails with this.target.addEventListener is not a function
.
It also reports TypeError: Cannot read property 'textTracks' of null
. (Depending on the browser, the order of these errors is sometimes reversed)
I don't know why it works standalone but not in a AngularJS directive...
The HTML fragment for the directive looks like:
...ANSWER
Answered 2021-May-21 at 14:04The angular.element
function returns a jQuery element, as does the jQuery find function. Consequently your videoTag
variable refers to a jQuery object.
On the other hand, the shaka.Player
constructor expects an HTMLMediaElement
. So passing videoTag[0]
should work.
QUESTION
I can't figure out how to fix this. playing a supposed low latency mpeg-dash manifest but it's with lots of lag, and play-stop-wait-play-stop-wait....
I have latest ubuntu with latest ffmpeg
here the command
...ANSWER
Answered 2021-Apr-07 at 20:01You are using an older version of dash.js. Try using the latest stable one which is currently version 3.2.1: http://cdn.dashjs.org/v3.2.1/dash.all.min.js
In your version 3.1.0 the settings look different:
QUESTION
I have a website that plays an icecast stream with jPlayer.
I want the play
button to always start the stream from the live position (like a radio) instead of picking the stream back up from the last position. Attempted behavior:
play
plays the stream live > pause
suspends / discards the stream / optionally stops downloading it > play
plays the stream from live position / reloads the stream.
There is a way to monitor the current media position with $.jPlayer.event.timeupdate
as mentioned in comment on this post, and use that to resume playing from the end of the stream.
Alternatively, there must be a way to discard the stream when pausing and then reloading it when hitting play
again. I think it is what is happening on this jPlayer demo. But I don't know how to do that part:
The error event is used with a check for the URL_NOT_SET error type to jPlayer("setMedia",stream) back to the live-stream again and jPlayer("play") it.
I am new to javascript and can't make it work. I can't find another post of someone trying to do that. I tried with the "playhead" at 100 which does not start the stream at all.
Here is the code I am using:
...ANSWER
Answered 2021-Mar-30 at 14:38I finally found the solution thanks to this answer on a different question related to achieving autoplay in jPlayer.
SOLUTION
QUESTION
I want to encode from any source to a universally playable .mpd with h264 codec.
Here my command
...ANSWER
Answered 2021-Mar-22 at 11:11video/mp4;codecs="avc1"
isn't a valid codecstring - it's missing the profile, constraints and level that are required by the SourceBuffer for this bitstream type.
It's happening because you have -flags -global_header
set. This is causing the codec extradata to be unset, which in turn means that the ffmpeg DASH manifest generator cannot generate the correct codecstring.
Remove -flags -global_header
and it should work fine.
QUESTION
we are trying to play drm MPD content from Chrome to Chromecast Our receiver app code is as follow:
...ANSWER
Answered 2021-Mar-11 at 11:44I think you are asking how you send the license URL from the sender client (the device 'casing') to the receiver (the device which will receive the request to cast and which actually get and plays the stream) in the custom data.
The custom data is a JSON object and you just need to put the license url into it.
There are two common ways of passing this custom data:
- include it in the MediaInfo object using the MediaInfo.Builder.setCustomData method
- include it the MediaLoadOptions data
As an example, looking at a MediaInfo example form the Google documents and adding in custom data:
QUESTION
I have looked at the previous answers for this question but the AAPT error still occurs.
...ANSWER
Answered 2021-Mar-05 at 15:28Unfortunately the hyphen '-' is not acceptable in a package name. Please reference this docs.
https://developer.android.com/guide/topics/manifest/manifest-element.html#package
A full Java-language-style package name for the Android app. The name may contain uppercase or lowercase letters ('A' through 'Z'), numbers, and underscores ('_'). However, individual package name parts may only start with letters. While building your app into the an application package (APK), the build system uses the package attribute for two things
Please change your package name to 'org.emarti202.gcu.mpd_cw_em'.
QUESTION
In our experience ExoPlayer does not use lower bitrate even there is latency in downloading big chunks and this causes freezing and buffering. However the bandwith is 6 Mbit, because of VBR sometimes the size of one 2 second chunk differs from 1.5 MegeByte to 15 MegaByte. In our experience when there is increase in bitrate the player still tries to download next chunk using same bitrate instead of lowering bitrate. What is causing this problem. Is there a way or configuration to fix this?
We are using default values of buffer sizes and track selection durations.
...ANSWER
Answered 2021-Feb-18 at 11:56I made a workaround for this. It works mostly.
QUESTION
I'm using modin.pandas to scale pandas for large dataset. However, when using pd.read_csv
to load a 5 MB csv dataset in jupyter notebook
to compare the performance of modin.pandas
and pandas
, it gives unexpected time duration of execution.
modin.pandas
is taking more time than pandas
. Why?
Code-
...ANSWER
Answered 2021-Jan-31 at 15:28It appears that Modin does some initialisation the first time it runs, which would explain why your Modin time was slower than your Pandas time for the 5MB CSV file.
I investigated how long it took to load various sizes of CSV file on a system with four cores, with both Pandas and Modin. Here is the graph of the results for CSV files from 5MB to 100MB:
And for files up to 2GB:
The results show that, on the system tested:
- Modin reads CSV files faster than Pandas for all file sizes except 5MB (the smallest file tested)
- The difference in performance is greater the larger the file size
- Modin took a disproportionately long time to process the 5MB file: 0.23s, compared to 0.12s for the 10MB file and 0.16s for the 15MB file
This is the code used to generate the results.
QUESTION
I have a MP4 video with SRT captions and I need to transcode them with media convert. In media convert I set automatic ABR and I specified the SRT origin path.
At the moment, I have tested the following:
- I set SRT file in one output and video/audio in another
- I set SRT, video and audio in the same output
For the first test, the job finish successfully, but on the S3 bucket there isnt any .SRT file. For the second test, the job fails with "aption destination type [SRT] requires a raw muxer." message
This is my JSON for the first test
...ANSWER
Answered 2021-Jan-28 at 22:52According to the AWS Elemental MediaConvert user guide, SRT is not a supported output for a DASH-ISO output group when the input caption type is SRT.
Here's a link to that guide (reference page 176): https://docs.aws.amazon.com/mediaconvert/latest/ug/mediaconvert-guide.pdf
The supported caption outputs for SRT input in DASH-ISO are:
- Burn in
- IMSC (as sidecar .fmp4)
- IMSC (as sidecar .xml)
- TTML (as sidecar .fmp4)
- TTML (as sidecar .ttml)
Additionally, there is a gap in the documentation. SRT->DASH-ISO+WebVTT is supported, even though it is not listed. The documentation will be corrected, but I wanted to share that with you in case it helps.
If you must send SRT to the output destination, then you could create a separate output group where the caption is in a track with no container (see pages 192-196 in the document).
QUESTION
I have a question: how to add dash assets (i.e., file_dash.mpd, file_1.m4s, and file_init.mp4) to be included?
The dash resources are valid; I tested teh media set (file_dash.mpd, file_1.m4s, and file_init.mp4) in a static HTML file.
Workaround: loading the files from an external https-resource, e.g., src="https://dash.akamaized.net/akamai/bbb_30fps/bbb_30fps.mpd" type="application/dash+xml" ) works fine.
Solution? I think possibly, webpack needs to be extended https://nuxtjs.org/faq/extend-webpack/ but I do not know how to do this.
Any help much appreciated!
Snippet
...ANSWER
Answered 2021-Jan-02 at 21:14Your answer is here: https://vuejs-templates.github.io/webpack/static.html
To answer this question, we first need to understand how Webpack deals with static assets. In *.vue components, all your templates and CSS are parsed by vue-html-loader and css-loader to look for asset URLs. For example, in and background: url(./logo.png), "./logo.png" is a relative asset path and will be resolved by Webpack as a module dependency.
Because logo.png is not JavaScript, when treated as a module dependency, we need to use url-loader and file-loader to process it. This template has already configured these loaders for you, so you get features such as filename fingerprinting and conditional base64 inlining for free, while being able to use relative/module paths without worrying about deployment.
I assume that what you need is "Real" Static Assets (it's explained at the same link), as there is no point to "pack" your media file along with JS.
In comparison, files in static/ are not processed by Webpack at all: they are directly copied to their final destination as-is, with the same filename. You must reference these files using absolute paths, which is determined by joining build.assetsPublicPath and build.assetsSubDirectory in config.js.
Alternatively you can change your nuxt configuration to load audio files as described in documentation:
You need to extend its default configuration in nuxt.config.js:
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