Android TVBox Play error

[itman2200]

Hi,

I built QtAVPlayer with Qt 5.12.12 and FFmpeg 6.1.
The video can be played on Windows and Android phones,
but it cannot be played on a Chinese Android TV Box with the following specifications:

Version: BigdroidOS 2.0.1
Android TV OS Version: 12
Kernel Version: 5.4.125
This TV Box can play videos using another open-source Qt AV player with FFmpeg 4.3.

I debugged my QtAVPlayer, and below is the error log:

`
I Zygote : seccomp disabled by setenforce 0
I co.LocalPlayer: Late-enabling -Xcheck:jni
D CompatibilityChangeReporter: Compat change id reported: 171979766; UID 10148; state: DISABLED
V GraphicsEnvironment: ANGLE Developer option for 'co.LocalPlayer' set to: 'default'
V GraphicsEnvironment: Neither updatable production driver nor prerelease driver is supported.
D NetworkSecurityConfig: No Network Security Config specified, using platform default
D NetworkSecurityConfig: No Network Security Config specified, using platform default
W System : ClassLoader referenced unknown path:
I QtCore : Start

02-18 19:20:28.702 6855 7078 D libMMPlayer.so:
D libMMPlayer.so: FFmpeg: [h264_mediacodec @ 0xdb1b9900] Failed to dequeue output buffer (status=-542398533)
02-18 19:20:28.702 6855 7078 D libMMPlayer.so:
D libMMPlayer.so: FFmpeg: [amediacodec @ 0xf4b115c0] java.lang.IllegalStateException occurred
02-18 19:20:28.702 6855 7078 D libMMPlayer.so:
D libMMPlayer.so: FFmpeg: [h264_mediacodec @ 0xdb1b9900] Failed to dequeue output buffer (status=-542398533)
02-18 19:20:28.702 6855 7078 D libMMPlayer.so:
D libMMPlayer.so: FFmpeg: [amediacodec @ 0xf4b115c0] java.lang.IllegalStateException occurred
02-18 19:20:28.703 6855 7078 D libMMPlayer.so:
D libMMPlayer.so: FFmpeg: [h264_mediacodec @ 0xdb1b9900] Failed to dequeue output buffer (status=-542398533)
02-18 19:20:28.703 6855 7078 D libMMPlayer.so:
D libMMPlayer.so: FFmpeg: [amediacodec @ 0xf4b115c0] java.lang.IllegalStateException occurred
02-18 19:20:28.703 6855 7078 D libMMPlayer.so:
D libMMPlayer.so: FFmpeg: [h264_mediacodec @ 0xdb1b9900] Failed to dequeue output buffer (status=-542398533)
02-18 19:20:28.703 6855 7078 D libMMPlayer.so:

`
please see full log file at attachment

Thanks.

https://www.mediafire.com/file/58bxdo7r1io6n83/errorlog.txt/file

[valbok]

Hello, thanks for the interest.

Could you please confirm that disabling hw could play the video?

Just set QT_AVPLAYER_NO_HWDEVICE=1

[valbok]

Also you could try to enable all debugs

https://github.com/valbok/QtAVPlayer/blob/master/src/QtAVPlayer/qavplayer.h#L150

QAVPlayer::setLogsLevelBackend(AV_LOG_DEBUG)

[itman2200]

Thank valbok,

As your suggest I add

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

qputenv("QT_AVPLAYER_NO_HWDEVICE", "1");    //  <=== add 1

QQuickView viewer;
viewer.setSource(QUrl(QString::fromLatin1("qrc:///main.qml")));
viewer.setResizeMode(QQuickView::SizeRootObjectToView);
QObject::connect(viewer.engine(), SIGNAL(quit()), &viewer, SLOT(close()));

QQuickItem *rootObject = viewer.rootObject();

#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
using VideoOutput = QDeclarativeVideoOutput;
#else
using VideoOutput = QQuickVideoOutput;
#endif

auto vo = rootObject->findChild<VideoOutput *>(QString::fromLatin1("videoOutput"));

QAVAudioOutput audioOutput;
QAVPlayer::setLogsLevelBackend(AV_LOG_DEBUG);            //  <=== add 2
QAVPlayer p;

some line of logs:
E libqml_video.so: [ffmpeg] [amediacodec @ 0xde31d300] java.lang.IllegalStateException occurred 02-20 23:23:25.149 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [h264_mediacodec @ 0xde3e9b80] Failed to dequeue output buffer (status=-542398533) 02-20 23:23:25.149 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [amediacodec @ 0xde31d300] java.lang.IllegalStateException occurred 02-20 23:23:25.149 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [h264_mediacodec @ 0xde3e9b80] Failed to dequeue output buffer (status=-542398533) 02-20 23:23:25.149 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [amediacodec @ 0xde31d300] java.lang.IllegalStateException occurred 02-20 23:23:25.150 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [h264_mediacodec @ 0xde3e9b80] Failed to dequeue output buffer (status=-542398533) 02-20 23:23:25.150 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [amediacodec @ 0xde31d300] java.lang.IllegalStateException occurred 02-20 23:23:25.150 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [h264_mediacodec @ 0xde3e9b80] Failed to dequeue output buffer (status=-542398533) 02-20 23:23:25.150 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [amediacodec @ 0xde31d300] java.lang.IllegalStateException occurred 02-20 23:23:25.151 10180 10339 E libqml_video.so: E libqml_video.so: [ffmpeg] [h264_mediacodec @ 0xde3e9b80] Failed to dequeue output buffer (status=-542398533) 02-20 23:23:25.151 10180 10339 E libqml_video.so:
full log are:
https://www.mediafire.com/file/mcjt0xog45fcm0u/errorlog.txt/file

[valbok]

maybe there is a bug since h264_mediacodec is hardcoded
https://github.com/valbok/QtAVPlayer/blob/master/src/QtAVPlayer/qavdemuxer.cpp#L223C54-L223C69

could you comment out

//    if (!codec.codec())
//        codec.setCodec(avcodec_find_decoder_by_name("h264_mediacodec"));

and rebuild?

[valbok]

FFmpeg 4.3.

possible to check fresher version?

[valbok]

also possible to disable rendering and check if there are some errors? Would check if there is an issue in rendering code.

[itman2200]

Thank valbok,
As your suggestion,
could you comment out

// if (!codec.codec()) // codec.setCodec(avcodec_find_decoder_by_name("h264_mediacodec"));

Video is playing now at Android TV Box.

However, some file formats have Audio distortion.

[valbok]

Thank valbok, As your suggestion, could you comment out

// if (!codec.codec()) // codec.setCodec(avcodec_find_decoder_by_name("h264_mediacodec"));

Video is playing now at Android TV Box.

However, some file formats have Audio distortion.

it means that needs to debug why h264_mediacodec does not work. Could you confirm that there are the same errors even if you don't render them?

F.e. comment out the code that renders QAVVideoFrame?

[valbok]

However, some file formats have Audio distortion.

It might mean that cpu is busy to decode and audio is out of sync. Proper fix would require fixing h264_mediacodec

[itman2200]

Thank you, Valbok,

I commented out the code that renders QAVVideoFrame and used the following line:

if (!codec.codec()) // codec.setCodec(avcodec_find_decoder_by_name("h264_mediacodec"));

This issue occurs only on Android TV Boxes. However, I have not yet tested it on other brands of Android TV Boxes.

All errors are similar:

02-22 15:02:36.962 16971 17043 D libMMPlayer.so: D libMMPlayer.so: FFmpeg: [h264_mediacodec @ 0xf1271280] Failed to dequeue output buffer (status=-542398533) 02-22 15:02:36.962 16971 17043 D libMMPlayer.so: D libMMPlayer.so: FFmpeg: [amediacodec @ 0xf0e485c0] java.lang.IllegalStateException occurred 02-22 15:02:36.963 16971 17043 D libMMPlayer.so: D libMMPlayer.so: FFmpeg: [h264_mediacodec @ 0xf1271280] Failed to dequeue output buffer (status=-542398533)

I tested the player on various Android phones and windows computer, it is working well.

Thank you again. I will be offline for about a month. Once I test on other Android TV Boxes, I will update you. You may close this issue or wait for my response in a month.

Thanks.

[valbok]

Looks like

E ACodec  : OMX/mediaserver died, signalling error!
E ACodec  : signalError(omxError 0x8000100d, internalError -32)
E MediaCodec: Codec reported err 0xffffffe0, actionCode 0, while in state 6/STARTED

this is very critical here, that the OMX/mediaserver died for some reason.

[valbok]

based on this https://stackoverflow.com/questions/38489850/android-mediacodec-decoding-mjpeg-frames

I solved my problem myself. It turns out that this particular decoder doesn't support output to surface, so the solution is to get raw ByteBuffer and then use GLES to do YUV->RGB conversion and display it on the screen.

It might mean that avoiding the rendering like disabling

QObject::connect(&p, &QAVPlayer::videoFrame, &p, [&](const QAVVideoFrame &frame) {

would not show any errors.

If so, then might be possible to try to convert frames to RGB and try to render this.

QObject::connect(&p, &QAVPlayer::videoFrame, &p, [&](const QAVVideoFrame &frame) {

QVideoFrame videoFrame = frame.convertTo(AV_PIX_FMT_RGB32); <<<

this will use software rendering, but might use h264_mediacodec decoder