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Simple Qt Video streaming application and only sound, no video (white screen)

After an intense search on this site I found nothing which fits
my problem. I want to write a small video streaming client on
an Android 5.1 device. The following code is used:
QApplication a(argc, argv);
QWidget *widget=new QWidget;
widget->resize(320,200);
QMediaPlayer *player=new QMediaPlayer;
QVideoWidget *vw= new QVideoWidget;
QHBoxLayout *layout=new QHBoxLayout;
layout->addWidget(vw);
widget->setLayout(layout);
player->setVideoOutput(vw);
player->setMedia(QUrl("rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov"));
player->play();
widget->show();
The problem is, the sound works but I only get a white screen.
the sound is playing but no video.
The VLC player on the android device is playing the video
correctly. I also used a small player in android studio and
it plays the video (but with high latency, so it is not useful for me)
I ran out of options what I can change to make it run.

Qt is not media friendly, if you want to play specific format/codec like MOV or h.264/h.265 ect... in a crossplatform way I advise you to use external lib like QtAV (http://www.qtav.org/) or VLC Qt wrapper (https://github.com/RSATom/QmlVlcDemo)

I believe the problem is that Android devices do not support the QuickTime Format (MOV) by default.
VLC Media Player on the other side, is well-known to be able to correctly play MOV videos.
Try testing videos with another format such as MP4or WebM to see how the program behaves.
I once developed a desktop software for streaming audio/video in Qt and I had the pleasure to work with the GStreamer framework.
Among many functionalities, it allows you to convert MOV videos to other formats.
You may check the GStreamer for Android tutorials and QtGstreamer, a set of well-implemented GSstreamer bindings for Qt.

Streaming and recording video on android at the same time

I am searching for a library which offer ability for streaming video from android device (5.1+) and recording it at the same time.
I tried MediaRecorder - the usual way to record videos on android - but with it I am not able to stream it over webrtc or rtsp because camera is busy.
Currently I am using libstreaming. With little modification done app can record and stream over rtsp concurrently. But this lib lacks support for hardware codec in MTK and SPRG chipsets.
I am wonder if you can recommend a solution or another lib which.
By the moment lib works only on nexus 4 with qcom chipset.

After several days of research, I came to the decision to use a combination of FFMpeg and MediaCodec.
It seems that the only way to get frames from camera at high rate is to use Android MediaCodec API. But MediaCodec supports only mp4 file formats, which is not an option for me (I need ts), while FFMpeg can process\create any kind of human known video formats.
Currently I am trying to make it work together (read ByteBuffer from MediaCodec and feed FFMpeg recorder with it).
Useful links:
Grafika project: https://github.com/google/grafika
ContinuousCapture and Show + record are the most interesting parts to check
javacpp (specifically FFMpeg wrapper): https://github.com/bytedeco/javacpp
Has example with recording and streaming.
kickflip sdk: https://github.com/Kickflip/kickflip-android-sdk
The library which makes two mentioned above tools works together and also is open sourced. Sadly it doesn't solve my problem fully. The feature I need is requested but not already implemented: https://github.com/bytedeco/javacv/issues/95

How to stream and play video using ffplay without buffering

I want to stream a live webcam video and display it on android device with the lowest latency possible. I am streaming video from a computer over rtsp protocol and I am able to watch the stream with ~150ms latency on the second computer using ffplay -fflags nobuffer rtsp://xxx.xxx.xxx.xxx:port/test.sdp command.
So far I have successfully compiled ffmpeg4android library. Unfortunately this library uses NDK which I am not familiar with. All I want to do is to be able to invoke the same command and display the video on the android SurfaceView.
How can I call for such command?

how to create ts (transport stream) video file from mp4 in android

In my project I need to implement an HLS (HTTP live Streaming) for an android device and it stream to an iOS device to play where android device will record the video and send it to server and iOS device will play the stream from the server using an m3u8 file. In the link below
Click Here
They have mention "Currently, the supported delivery format is MPEG-2 Transport Streams for audio-video".
Now problem is that in android you can record only in mp4 by default (correct me if i am wrong). Now I need some third party API or library like ffmpeg, Gstreamer, Xuggler, Jcodec to transcode recorded mp4 to ts files.
ffmpeg, jffmpeg and Gstreamer have a learning curve and to setup time and also need NDK. So I need some help because I don't have enough time to try one of these please refer me if you know any library which is easy to use and does not have a complex learning and setup time. Like Jcodec which is pure java base and plug and play type library but I don't think it can do this for me as they have mention in there documentation they support h262 codec support yet but i need h264 and ACC for audio.

FYI:
JJPMEG
It is a Java binding to FFmpeg and it have an android verison too. Maybe you can give it a try.
https://code.google.com/p/jjmpeg/
Or:
Maybe you can just record the video with supporting encoding and transcode the video in the server side?

Adding video codec to Android

Can someone please explain the steps I need to take in order to add a
new codec to Android?
Also, I would like the codec to be installed as part of an application
installation (or first launch) and NOT as part of a full Android OS
build.
The reason I want to do this is that I have an application that needs
to show a video of a non supported codec (HLS or TS), but I wouldn't
want to build a full blown video player - just integrate with the
existing, built-in, player.
Thanks,
Alik.

Can someone please explain the steps I need to take in order to add a new codec to Android?
Build your own firmware, or build your own media player (like VLC for Android).
Also, I would like the codec to be installed as part of an application installation (or first launch) and NOT as part of a full Android OS build.
That is not possible, unless you build your own media player.
The reason I want to do this is that I have an application that needs to show a video of a non supported codec (HLS or TS), but I wouldn't want to build a full blown video player - just integrate with the existing, built-in, player.
VLC for Android is due out (at least for some phones) shortly, so it may be able to play your format.

I think it maybe possible to add custom codec(though I have not tried) by referring to the android developer page Adding custom codec to android.
You can try out adding your codec through openMAX IL layer then call up the android media player to play it(I believe vlc has done in this way but uses its own player). The awesome player, the android default player, just fetch a list of codecs available through openMAX API and if there is a codec, it plays. So it is worth to try adding your codec during initialization of your app, and call up media player.