seek over timeline

[Nelu]

Hello,
I use the timeline editing functions and I have problems when inserting a
high-resolution audio-video clip, and in a portion over the video, I insert
2-3 png images. Problems occur when I seek over the portion where the images
are placed, then there is a delay of 2-3 seconds and after that, the last
images from the seek operation comes on. Has anyone encountered a similar
problem? Looks like seek operations are stored in a cache ... is there a
possibility to clear this cache?
The code used to insert the video file and the images are as below:

        timeline = ges_timeline_new();
        tracka = GES_TRACK(ges_audio_track_new());
        trackv = GES_TRACK(ges_video_track_new());

        /* We are only going to be doing one layer of clips */
        layer1 = ges_layer_new();
        layerImg1 = ges_layer_new();
        layerImg2 = ges_layer_new();
        layerImg3 = ges_layer_new();

        g_object_set(layerImg1, "priority", 1, NULL);
        g_object_set(layerImg2, "priority", 2, NULL);
        g_object_set(layerImg3, "priority", 3, NULL);
        g_object_set(layer1, "priority", 4, NULL);


        /* Add the tracks and the layer to the timeline */
        if (!ges_timeline_add_layer(timeline, layer1)) return -1;
        if (!ges_timeline_add_layer(timeline, layerImg1)) return -1;
        if (!ges_timeline_add_layer(timeline, layerImg2)) return -1;
        if (!ges_timeline_add_layer(timeline, layerImg3)) return -1;

        if (!ges_timeline_add_track(timeline, tracka)) return -1;
        if (!ges_timeline_add_track(timeline, trackv)) return -1;

        //Insert first video file there
        gchar *uri1 = gst_filename_to_uri("C:\\KSV1\\GuitarChops.mp4", NULL);
        GESUriClip *src1 = ges_uri_clip_new(uri1);
        g_assert(src1);
        g_free(uri1);
        g_object_set(src1, "start", 0, "duration", 30 * GST_SECOND, NULL);
        ges_layer_add_clip(layer1, (GESClip *)src1);


        //Insert some png image on top of the video
        gchar *uri_png = gst_filename_to_uri("C:\\KSV1\\overlay1.png", NULL);
        GESUriClip *src_png = ges_uri_clip_new(uri_png);
        ges_uri_clip_set_is_image(src_png, true);
        g_free(uri_png);
        g_object_set(src_png, "start", 10 * GST_SECOND + 1, "in-point", 0,
                "duration", 8 * GST_SECOND + 1, NULL);
        ges_layer_add_clip(layerImg1, GES_CLIP(src_png));
        uri_png = gst_filename_to_uri("C:\\KSV1\\overlay2.png", NULL);
        src_png = ges_uri_clip_new(uri_png);
        ges_uri_clip_set_is_image(src_png, true);
        g_free(uri_png);
        g_object_set(src_png, "start", 10 * GST_SECOND + 1, "in-point", 0,
                "duration", 8 * GST_SECOND + 1, NULL);
        ges_layer_add_clip(layerImg2, GES_CLIP(src_png));
        uri_png = gst_filename_to_uri("C:\\KSV1\\overlay3.png", NULL);
        src_png = ges_uri_clip_new(uri_png);
        ges_uri_clip_set_is_image(src_png, true);
        g_free(uri_png);
        g_object_set(src_png, "start", 10 * GST_SECOND + 1, "in-point", 0,
                "duration", 8 * GST_SECOND + 1, NULL);
        ges_layer_add_clip(layerImg3, GES_CLIP(src_png));

and the seeking operation is done with:
                gst_element_seek(GST_ELEMENT(gesPipeline), 1.0, GST_FORMAT_TIME,
GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_NONE, 0);

Thanks,
Nelu



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[Thibault Saunier-4]

Hello,

Usually, the usual way is to wait for a seek you send to be executed (by waiting for ASYNC_DONE message on the bus), meanwhile the seek should not be pushed to the pipeline (usually we just keep the last one, and send it when previous one is done).

BR,

Thibault

On Wed, Mar 25, 2020 at 8:51 PM Nelu <[hidden email]> wrote:

Hello,
I use the timeline editing functions and I have problems when inserting a
high-resolution audio-video clip, and in a portion over the video, I insert
2-3 png images. Problems occur when I seek over the portion where the images
are placed, then there is a delay of 2-3 seconds and after that, the last
images from the seek operation comes on. Has anyone encountered a similar
problem? Looks like seek operations are stored in a cache ... is there a
possibility to clear this cache?
The code used to insert the video file and the images are as below:

        timeline = ges_timeline_new();
        tracka = GES_TRACK(ges_audio_track_new());
        trackv = GES_TRACK(ges_video_track_new());

        /* We are only going to be doing one layer of clips */
        layer1 = ges_layer_new();
        layerImg1 = ges_layer_new();
        layerImg2 = ges_layer_new();
        layerImg3 = ges_layer_new();

        g_object_set(layerImg1, "priority", 1, NULL);
        g_object_set(layerImg2, "priority", 2, NULL);
        g_object_set(layerImg3, "priority", 3, NULL);
        g_object_set(layer1, "priority", 4, NULL);


        /* Add the tracks and the layer to the timeline */
        if (!ges_timeline_add_layer(timeline, layer1))  return -1;
        if (!ges_timeline_add_layer(timeline, layerImg1)) return -1;
        if (!ges_timeline_add_layer(timeline, layerImg2)) return -1;
        if (!ges_timeline_add_layer(timeline, layerImg3)) return -1;

        if (!ges_timeline_add_track(timeline, tracka))          return -1;
        if (!ges_timeline_add_track(timeline, trackv))          return -1;

        //Insert first video file there
        gchar *uri1 = gst_filename_to_uri("C:\\KSV1\\GuitarChops.mp4", NULL);
        GESUriClip *src1 = ges_uri_clip_new(uri1);
        g_assert(src1);
        g_free(uri1);
        g_object_set(src1, "start", 0, "duration", 30 * GST_SECOND, NULL);
        ges_layer_add_clip(layer1, (GESClip *)src1);


        //Insert some png image on top of the video
        gchar *uri_png = gst_filename_to_uri("C:\\KSV1\\overlay1.png", NULL);
        GESUriClip *src_png = ges_uri_clip_new(uri_png);
        ges_uri_clip_set_is_image(src_png, true);
        g_free(uri_png);
        g_object_set(src_png, "start", 10 * GST_SECOND + 1, "in-point", 0,
                "duration", 8 * GST_SECOND + 1, NULL);
        ges_layer_add_clip(layerImg1, GES_CLIP(src_png));
        uri_png = gst_filename_to_uri("C:\\KSV1\\overlay2.png", NULL);
        src_png = ges_uri_clip_new(uri_png);
        ges_uri_clip_set_is_image(src_png, true);
        g_free(uri_png);
        g_object_set(src_png, "start", 10 * GST_SECOND + 1, "in-point", 0,
                "duration", 8 * GST_SECOND + 1, NULL);
        ges_layer_add_clip(layerImg2, GES_CLIP(src_png));
        uri_png = gst_filename_to_uri("C:\\KSV1\\overlay3.png", NULL);
        src_png = ges_uri_clip_new(uri_png);
        ges_uri_clip_set_is_image(src_png, true);
        g_free(uri_png);
        g_object_set(src_png, "start", 10 * GST_SECOND + 1, "in-point", 0,
                "duration", 8 * GST_SECOND + 1, NULL);
        ges_layer_add_clip(layerImg3, GES_CLIP(src_png));

and the seeking operation is done with:
                gst_element_seek(GST_ELEMENT(gesPipeline), 1.0, GST_FORMAT_TIME,
GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET, position, GST_SEEK_TYPE_NONE, 0);

Thanks,
Nelu



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[Nelu]

Thank you Thibault, I will try what you suggested.



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