[gst-devel] Video thumb nails

[Scott Shawcroft]

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Pavan,
I'm not sure what it is.  Attached is my python code.
~Scott

Pavan Kumar Patale wrote:
> Hi,
>
> Thanks for the reply.  I tried applying the solution but a blank png
> image comes up.
> Seek does not seem to be happening correctly.  Have, appended the
> code.  Can you
> pls let me know if i am missing something in it.
>
> Thanks,
> Pavan.
>
>>
>> I just wanted to note that you may need to turn on these signals by
>> setting the fakesink's signal-handoffs property to true.
>> ~Scott
>>
>> Michal Benes wrote:
>> >> Can anyone pls let me know if there is any support from GStreamer
>> framework
>> >> to create thumb nails for video files.
>> >
>> > Hi,
>> >
>> >     it is not difficult. Just create a pipe
>> >
>> > filesrc location=source ! decodebin ! ffmpegcolorspace ! pngenc !
>> > fakesink
>> >
>> > and connect to fakesink's preroll-handoff signal. Then put the
>> pipeline
>> > to PAUSED state (not PLAYING) and seek to the desired position.
>> Fakesink
>> > will give you png screenshot in preroll-handoff callback. Of
>> course you
>> > can put videoscale before pngenc to obtain the desired resolution.
>> >
>> >     Michal
>> >
>
>
> #include <glib.h>
> #include <gst/gst.h>
>
> static GstElement *pipeline = NULL;
> static GMainLoop *loop = NULL;
> static GstElement *fsink = NULL;
> static GError *error = NULL;
>
> static void preroll_handoff_cb(GstElement * object,
>                               GstBuffer * buffer,
>                               GstPad * pad, gpointer user_data)
> {
>    g_print("Starts %s\n", __FUNCTION__);
>    FILE *fp = NULL;
>    fp = fopen("tnail.png", "wb");
>    fwrite(buffer->data, buffer->size, 1, fp);
>    fclose(fp);
>    g_print("Ends %s\n", __FUNCTION__); }
>
> gint main(gint argc, gchar * argv[])
> {
>    gst_init(&argc, &argv);
>
>    loop = g_main_loop_new(NULL, TRUE);
>
>    pipeline =      gst_parse_launch ("filesrc location=1.avi ! queue
> ! decodebin ! ffmpegcolorspace ! pngenc ! fakesink name=fsink",
> &error);
>
>    if (!pipeline) {
>        g_print("Unable to get the pipeline\n");
>        return -1;
>    }
>
>    if (error) {
>        g_print("Error %s\n", error->message);
>        g_error_free(error);
>        error = NULL;
>        return -1;
>    }
>
>    fsink = gst_bin_get_by_name(GST_BIN(pipeline), "fsink");
>
>    g_object_set(G_OBJECT(fsink), "signal-handoffs", TRUE, NULL);
>
>    g_signal_connect(G_OBJECT(fsink), "preroll-handoff",
> preroll_handoff_cb, NULL);
>
>    if (!gst_element_set_state(pipeline, GST_STATE_PAUSED)) {
>        g_print("Unable to set the state to paused\n");
>    }
>    if (!gst_element_seek_simple(fsink, GST_FORMAT_BYTES,
> GST_SEEK_FLAG_ACCURATE, 0)) {
>        g_print("Unable to seek\n");
>    }
>
>    g_print("Inside loop\n");
>    g_main_loop_run(loop);
>    return 0;
> }
>
>
>
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