Android Question Viewing a video in realtime

AlpVir · May 29, 2020

Step 1
The following code displays a realtime video from a local IP webcam :

B4X:

webview1.Initialize("webview1")
Activity.AddView (webview1,0,0,100%x,100%y)
URL="http://admin:@192......1/video2.mjpg"     ' OK   (va bene in locale, con wifi
webview1.LoadUrl(URL)

Step 2
The following HTML code refers to a web page http: // ****** /test.html which displays the aforementioned video stream in realtime
The page can be viewed in any browser on a PC, but not on a smartphone (as far as I know)

B4X:

<!DOCTYPE html>
<html>
<head><meta http-equiv="Pragma" content="no-cache" /><meta http-equiv="Chache-Control" content="no-cache" /></head>
<body>
TEST 1<BR>
<iframe src="http://admin:@192.1.......1/video1.mjpg?autoplay=1&rel=1" width="800" height="640"></iframe>
</body>
</html>

Step 3
The following code B4A does NOT display the video, but only the word "TEST 1" followed by a white and empty box.

B4X:

webview1.Initialize("webview1")
Activity.AddView (webview1,0,0,100%x,100%y)
URL="http://*******/test.html"   
webview1.LoadUrl(URL)

Is there any way to view this video?
Thank you in advance

JohnC · May 29, 2020

Did you try adding the chromeclient to webview:

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www.b4x.com

Biswajit · May 29, 2020

Did you tried exoplayer?

AlpVir · May 29, 2020

@Biswajit : Yes, I have already tried ExoPlayer which however does not display HTML pages but only MP4 and the like.
@JohnC : Thanks but honestly I don't know how to use addWebChromeClient which I don't think is an event supported by WebViewExtras or WebViewExtras2. Furthermore, the second parameter should be a False or True, not a string.

JohnC · May 29, 2020

Just add the WebViewExtras (v1.42) lib to your project, then add these lines before any wv.LoadURL or wv.LoadHTML:

B4X:

Dim wv as WebView
Dim wve as WebViewExtras  
wve.addWebChromeClient(wv, "WVE")

The "WVE" parameter is just the event name prefix for any webviewextras events (no events are triggered when just adding the chrome client)

AlpVir · May 29, 2020

Thanks but there is no change. "TEST 1" and the blank white box appear; no image or video ?
I seem to remember that Erel once wrote that webview is not suitable for viewing video streams. However I have experienced it, it is grateful to play an MP4 file.

B4X:

Dim URL                 As String
    Dim webview1             As WebView
    Dim WebViewExtras1         As WebViewExtras
    webview1.Initialize("webview1")
    Activity.AddView (webview1,0,0,100%x,100%y)
    URL="http://p***********i/c****.html"
    WebViewExtras1.addWebChromeClient(webview1, "WebViewExtras1")
    webview1.LoadUrl(URL)

drgottjr · May 30, 2020

are you sure this is supposed to work in a webview? i think you need an imageview. there are several links in the forum relating to mjpg viewing. here's one:
https://www.b4x.com/android/forum/threads/b4x-class-mjpeg-decoder.73702/#post-639699 there are others

AlpVir · May 30, 2020

As mentioned above I'm not sure if the webview component is suitable for this purpose.
But I can't find other ways.
I need to view an HTML page that includes a video stream. Do not directly view a video stream.
This is the very last link of a complex (for me) project that includes a rasperry connected to the web through a service like NoIP.com
How to solve ?

Biswajit · May 30, 2020

Add this to manifest and enable JavaScript before loading url. Also add chromeclient and webviewclient

B4X:

SetApplicationAttribute(android:hardwareAccelerated, "true")

Check if this works or not.

AlpVir · May 30, 2020

Nothing !
I added the line to the manifest.
I also tried the AdvancedWebView library
Nothing !

B4X:

  Dim URL                 As String
    webview1.Initialize("")
    WebViewExtras1.Initialize(webview1)
    webview1.JavaScriptEnabled=True
    WebViewExtras1.JavaScriptEnabled=True

    Dim WebChromeClient1 As DefaultWebChromeClient
    WebChromeClient1.Initialize("WebChromeClient1")
    WebViewExtras1.SetWebChromeClient(WebChromeClient1)
 
    Dim WebViewClient1 As DefaultWebViewClient
    WebViewClient1.Initialize("WebViewClient1")
    WebViewExtras1.SetWebViewClient(WebViewClient1)
   
    Activity.AddView (webview1,0,0,100%x,100%y)
    URL="http://########/#######e.html"
    WebViewExtras1.LoadUrl(URL)

Biswajit · May 30, 2020

Are you getting any log in b4a? check webview console outputs from chromeclient console message event.

AlpVir · May 30, 2020

Log

Logger connesso a: asus ASUS_Z00AD
--------- beginning of main
[16170] Initialize library(version: 5.0.7a_y.48167 RELEASE)... successfully.
SetAppTypeFace- try to flip, app = b4a.example
Typeface getFontPathFlipFont - systemFont = default#default
SetAppTypeFace- try to flip, app = b4a.example
Typeface getFontPathFlipFont - systemFont = default#default
common created.
Starting remote logger. Port: 35352
Render dirty regions requested: true
Validating map...
After accept
Initialized EGL, version 1.4
Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
Enabling debug mode 0
*** Debugger waiting for connection (0) ***
Application requested CPU execution
0xde108000 Launching thread(s), CPUs 4
*** Debugger waiting for connection (1) ***
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
primaryArchIs64bit = false
Loading com.google.android.webview version 83.0.4103.83 (code 410408351)
Loaded native library version number "83.0.4103.83"
Flushed 3 samples from 3 histograms.
validate_display:255 error 3008 (EGL_BAD_DISPLAY)
Requires BLUETOOTH permission
** Activity (main) Resume **
Unsupported profile 4 for video/mp4v-es
HW encoder for video/avc is not available on this device.
-1 received
writer error
java.lang.InterruptedException
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:1991)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2025)
at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:373)
at anywheresoftware.b4a.remotelogger.Connector$Writer.run(Connector.java:160)
at java.lang.Thread.run(Thread.java:818)
Starting remote logger. Port: 35352
After accept

Biswajit · May 30, 2020

Check the log.

Unsupported profile 4 for video/mp4v-es
HW encoder for video/avc is not available on this device.

AlpVir · May 30, 2020

Thanks for support.
However, the same smartphone displays a real-time video stream from another smartphone.
But use ImageView
So do you think it is impossible to view the video stream contained in an HTML page?

B4X:

    ImageView1.Initialize("ImageView1")
    Activity.AddView(ImageView1,0,0,100%x,100%y)
    mj1.Initialize(Me, "mj1")
    mj1.Connect("192.168.178.24/", 51042)

Biswajit · May 30, 2020

Use exoplayer to view the video stream

AlpVir · May 30, 2020

To me it appears that exoplayer does NOT display HTML files but directly video streams or MP4 files

Biswajit · May 30, 2020

AlpVir said:
To me it appears that exoplayer does NOT display HTML files but directly video streams or MP4 files

I know. You asked me,

AlpVir said:
So do you think it is impossible to view the video stream contained in an HTML page?

That's why I told you to use exoplayer. If you want to show the full html page then you have change the server video code, as you see in the log that your device doesn't support this kind of video format

AlpVir · Jun 1, 2020

you have change the server video code

The webcam operates in both MPEG and H.264. But I don't know how the Raspberry re-elaborates this video stream. How can I understand it?
In summary: a webcam (Dlink DCS 2130) on the local network creates a video stream; a Raspberry (always on the local network) receives it and is able to make it available on the internet through an HTML page whose local address is 192.168.xxx.x / cin.html
To do this, use a dynamic DNS of the type http://xxxxx.ddns.com/cin.html
Within the local network, this video can be viewed on any device. Outside no.
HTML pages residing on the Raspberry are seen correctly.
I would like to use a smartphone to see this video.
But incompatibility problems, not yet clear to me, prevent me.
Any other useful suggestions?

max123 · Sep 25, 2021

AlpVir said:
Thanks but there is no change. "TEST 1" and the blank white box appear; no image or video ?
I seem to remember that Erel once wrote that webview is not suitable for viewing video streams. However I have experienced it, it is grateful to play an MP4 file.

B4X:

Dim URL As String Dim webview1 As WebView Dim WebViewExtras1 As WebViewExtras webview1.Initialize("webview1") Activity.AddView (webview1,0,0,100%x,100%y) URL="http://p***********i/c****.html" WebViewExtras1.addWebChromeClient(webview1, "WebViewExtras1") webview1.LoadUrl(URL)

Not sure for this, with Google Nexus 7 2013 I show an html page exposed by ESP32CAM inside a regular WebView, it works even without use of WebViewExtras and without add a ChromeClient, inside this page there are camera controls and a button to start a stream of MJPEG video, it work very well on all resolutions from 160x120 to 1600x1200. The same code do not work on my Asus ZenFone2, tryed adding CromeClient bat without success, the page is loaded but return me this message:

header fields are too long for server to interpret

Suggestions to fix are very welcome.
Thanks

Android Question Viewing a video in realtime

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