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AM4378: video file playing with gstreamer

WR KIM
Prodigy 180 points

Part Number: AM4378

Hi,

I have ported linux kerenl on custom AM437x board based on AM437x-gp-evm.

I am trying to play a video using GStreamer. I tested it with a sample video from the SDK filesystem.

When I run: 'gst-launch-1.0 playbin uri=file:///usr/share/ti/video/TearOfSteel-AV-Short-720x406.mp4', it seems to play on Wayland, and the playback is smooth.

However, I want to play it without Wayland, so when I run: 'gst-launch-1.0 filesrc location=/usr/share/ti/video/TearOfSteel-AV-Short-720x406.mp4 ! decodebin ! kmssink ', the following log is printed.

Setting pipeline to PAUSED ...
ERROR: from element /GstPipeline:pipeline0/GstKMSSink:kmssink0: Could not open DRM module (NULL)
Additional debug info:
../gst-plugins-bad-1.20.7/sys/kms/gstkmssink.c(850): gst_kms_sink_start (): /GstPipeline:pipeline0/GstKMSSink:kmssink0:
reason: No such file or directory (2)
ERROR: pipeline doesn't want to preroll.
ERROR: from element /GstPipeline:pipeline0/GstKMSSink:kmssink0: GStreamer error: state change failed and some element failed to post a proper error message with the reason for the failure.
Additional debug info:
../gstreamer-1.20.7/libs/gst/base/gstbasesink.c(5878): gst_base_sink_change_state (): /GstPipeline:pipeline0/GstKMSSink:kmssink0:
Failed to start
ERROR: pipeline doesn't want to preroll.
Failed to set pipeline to PAUSED.
Setting pipeline to NULL ...
Freeing pipeline ...


Is this issue related to Wayland?

  • 0
    TI__Mastermind 36790 points

    Hi,

    Can you do a gst-inspect on your target board to see if kmssink is present?

    Also, if not you may have to download the gst-plugins-bad so kmssink is available.

    Best Regards

    Suren

  • 0 in reply to Suren Porwar
    Prodigy 180 points

    Hi,

    When I enter the 'gst-inspect-1.0', below log is printed.

    accurip:  accurip: AccurateRip(TM) CRC element
adder:  adder: Adder
adpcmdec:  adpcmdec: ADPCM decoder
adpcmenc:  adpcmenc: ADPCM encoder
aes:  aesdec: aesdec
aes:  aesenc: aesenc
aiff:  aiffmux: AIFF audio muxer
aiff:  aiffparse: AIFF audio demuxer
alaw:  alawdec: A Law audio decoder
alaw:  alawenc: A Law audio encoder
alpha:  alpha: Alpha filter
alphacolor:  alphacolor: Alpha color filter
alsa:  alsadeviceprovider (GstDeviceProviderFactory)
alsa:  alsamidisrc: AlsaMidi Source
alsa:  alsasink: Audio sink (ALSA)
alsa:  alsasrc: Audio source (ALSA)
apetag:  apedemux: APE tag demuxer
app:  appsink: AppSink
app:  appsrc: AppSrc
asfmux:  asfmux: ASF muxer
asfmux:  asfparse: ASF parser
asfmux:  rtpasfpay: RTP ASF payloader
audiobuffersplit:  audiobuffersplit: Audio Buffer Split
audioconvert:  audioconvert: Audio converter
audiofx:  audioamplify: Audio amplifier
audiofx:  audiochebband: Band pass & band reject filter
audiofx:  audiocheblimit: Low pass & high pass filter
audiofx:  audiodynamic: Dynamic range controller
audiofx:  audioecho: Audio echo
audiofx:  audiofirfilter: Audio FIR filter
audiofx:  audioiirfilter: Audio IIR filter
audiofx:  audioinvert: Audio inversion
audiofx:  audiokaraoke: AudioKaraoke
audiofx:  audiopanorama: Stereo positioning
audiofx:  audiowsincband: Band pass & band reject filter
audiofx:  audiowsinclimit: Low pass & high pass filter
audiofx:  scaletempo: Scaletempo
audiofx:  stereo: Stereo effect
:
alsa:  alsasrc: Audio source (ALSA)
apetag:  apedemux: APE tag demuxer
app:  appsink: AppSink
app:  appsrc: AppSrc
asfmux:  asfmux: ASF muxer
asfmux:  asfparse: ASF parser
asfmux:  rtpasfpay: RTP ASF payloader
audiobuffersplit:  audiobuffersplit: Audio Buffer Split
audioconvert:  audioconvert: Audio converter
audiofx:  audioamplify: Audio amplifier
audiofx:  audiochebband: Band pass & band reject filter
audiofx:  audiocheblimit: Low pass & high pass filter
audiofx:  audiodynamic: Dynamic range controller
audiofx:  audioecho: Audio echo
audiofx:  audiofirfilter: Audio FIR filter
audiofx:  audioiirfilter: Audio IIR filter
audiofx:  audioinvert: Audio inversion
audiofx:  audiokaraoke: AudioKaraoke
audiofx:  audiopanorama: Stereo positioning
audiofx:  audiowsincband: Band pass & band reject filter
audiofx:  audiowsinclimit: Low pass & high pass filter
audiofx:  scaletempo: Scaletempo
audiofx:  stereo: Stereo effect

    I think gst-inspection is already installed.

  • 0 in reply to WR KIM
    TI__Mastermind 36790 points

    Hi Kim,

    Wanted to know if kmssink shows up when you run gst-inspect.

    If not, you would need to include gstreamer-bad-plugins in your default sdk image to see it. 

    Best Regards

    Suren

  • 0 in reply to Suren Porwar
    Prodigy 180 points

    Hi,

    What you mentioned was already installed.

    When I ran: 

    gst-launch-1.0 filesrc location=/usr/share/ti/video/TearOfSteel-AV-Short-720x406.mp4 ! decodebin ! videoconvert ! kmssink driver-name=omapdrm connector-id=52 plane-id=32

    the problem was sloved.

    I have additional question.

    I am trying to play a video in Qt. 

    When I run: gst-launch-1.0 playbin uri=file:///usr/share/ti/video/TearOfSteel-AV-Short-720x406.mp4, the video plays most smoothly.

    What is the best way to play it in Qt? I run the Qt application on eglfs platform. Please recmmend.

  • 0 in reply to WR KIM
    TI__Mastermind 36790 points

    Hi Kim,

    Glad you were able to get it working with kmssink.

    For using QT, have you looked at QMediaplayer and QVideowidget class for implementation and validation.

    Simple sample  QT 6 approach would be something like below:

    #include <QApplication>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QAudioOutput>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    
    QVideoWidget *videoWidget = new QVideoWidget;
    QMediaPlayer *player = new QMediaPlayer;
    QAudioOutput *audioOutput = new QAudioOutput;
    
    player->setVideoOutput(videoWidget);
    player->setAudioOutput(audioOutput);
    player->setSource(QUrl::fromLocalFile("/path/to/video.mp4"));
    
    videoWidget->resize(800, 600);
    videoWidget->show();
    player->play();
    
    return app.exec();
}

    Please refer: https://doc.qt.io/qt-6/qvideowidget.html for more information.

    Best Regards

    Suren