valbok / qtavplayer Goto Github PK

https://ffmpeg.org/ffmpeg-filters.html

For some reasons cmake-produced project for qml_video references Qt5MultimediaQuick.lib instead of Qt5MultimediaQuickd.lib on Windows. Qt 5.12.10 issue?

At the moment QtAVPlayer is 'Qt module', but there are some cases where it is more convenient to use it as the library so would be helpful if it could provide related pro / pri file.

Subfile input protocol of ffmpeg which allows providing a byte range of an input to read

Taking into account asynchronous nature of seek currently it is not possible to understand when exactly it is finished (and understanding when it is finished is critical for resolving actual post-seek position).

I see the following options to solve this:

1. Introduce 'SeekingState' into State - this way calling code would be able to listed for state changed signal and listen for 'SeekingState' => 'PausedState' or 'SeekingState' => 'PlayingState'. The drawback is in need to preserve previous state to 'auto-pause' or 'auto-play' after seek completion.

2. Introduce signal for 'wait' changes. Main issue with this approach is proper naming for this pretty low-level signal

3. Make 'seek' to accept callback - feels pretty unnatural / non-Qt way.

Any other ideas? I'm leaning towards the first option but want to hear thoughts before proceeding with implementation.

Return as closest frame as possible

Finally I've got some time to play with most recent changes (and started with 5.15.2 for simplicity).

Here is what I've got on windows using qml_video example:

1. Crash on a code responsible for audio playback.

Maybe because of 'QAudioOutput: open error, invalid format.' but it used to work in the past I think...

2. After commenting out audio-related lines...

If executed from debugger:

If executed without debugger - window is black (in rare occasions I do see first frame from 'big buck bunny') - and then it crashes in a second.

... for example AV_PIX_FMT_YUV411P

QAVPlayer p;

QFileInfo fileInfo(path());
QFile file(path());
file.open(QFile::ReadOnly);

// works
/*
{
    QAVVideoFrame frame;
    QObject::connect(&p, &QAVPlayer::videoFrame, &p, [&frame](const QAVVideoFrame &f) {
        qDebug() << "got frame";
    });

    p.setSource(QUrl(fileInfo.fileName()), &file);
    p.stepForward();

    QTest::qWait(1000);
}
*/

QBuffer buffer;
buffer.open(QIODevice::ReadWrite);

QAVVideoFrame frame;
QObject::connect(&p, &QAVPlayer::videoFrame, &p, [&frame](const QAVVideoFrame &f) {
    qDebug() << "got frame";
});

p.setSource(QUrl(fileInfo.fileName()), &buffer);

while(!file.atEnd()) {
    auto bytes = file.read(4096);
    buffer.write(bytes);

    p.stepForward();
}

QTest::qWait(10000);

What would it take to add Qt 5.12 support?

At the moment it doesn't seem to be working even after specifying 'flushMode: VideoOutput.LastFrame' on VideoFrame

... with API like 'setFilter(QString filterString)'

for example by specifying environment variable(s) FFMPEG / FFMPEG_INCLUDES / FFMPEG_LIBS

FAIL! : tst_QAVPlayer::lastFrame() Compared values are not the same
Loc: [tst_qavplayer.cpp(2077)]