Data loss in Buffer to mp4 file conversion

[Sulthan Amanu]

Hi Team,

I'm attempting to convert a raw buffer into an MP4 format using an appsrc.
However, I encountered a problem with frame loss during the conversion of a
list of buffers. For instance, I have a list of 150 frames with a frame
rate of 10 frames per second (fps), but the resulting MP4 file only
contains 13 seconds of video. This means that 2 seconds worth of frames (20
frames) have been lost during the conversion process. Below, you'll find
the code for my conversion logic:

CODE:

void convertToMP4(GstBufferList *buflist)
{
    // Create pipeline for MP4 conversion.
    GstElement *pipeline, *appsrc, *videoconvert, *videoencode, *muxer,
*file_sink;
    guint64 timestamp_ns = 0; // Initialize with zero or the desired start
time in nanoseconds
    guint frame_duration_ns = GST_SECOND / 10; // 10 frames per second (10
FPS)
    pipeline = gst_pipeline_new("MP4-pipeline");
    appsrc = gst_element_factory_make("appsrc", "source");
    file_sink = gst_element_factory_make("filesink", "filesink");

    g_object_set(G_OBJECT(appsrc),
                 "stream-type", 0,
                 "format", GST_FORMAT_TIME, NULL);

    // Set the resolution and framerate caps
    // GstCaps *caps = gst_caps_new_simple("video/x-raw",
    //     "width", G_TYPE_INT, 1280,
    //     "height", G_TYPE_INT, 720,
    //     "framerate", GST_TYPE_FRACTION, 10, 1,
    //     NULL);

    // gst_app_src_set_caps (GST_APP_SRC(appsrc),caps);

    // gst_caps_unref(caps);

    g_object_set(file_sink, "location", "DIA_VIDEO.mp4", NULL);

    gst_bin_add_many(GST_BIN(pipeline), appsrc, file_sink, NULL);
    if (gst_element_link_many(appsrc, file_sink, NULL) != TRUE)
    {
        g_printerr("Elements could not be linked in the pipeline.\n");
        gst_object_unref(pipeline);
        exit(1);
    }

    copy_buflist = gst_buffer_list_copy_deep(buflist);
    g_print("isbuffered is filled and Buffer size is %d\n",
gst_buffer_list_length(copy_buflist));
    gst_element_set_state(pipeline, GST_STATE_PLAYING);

    for (int frame_number = 0; frame_number <
gst_buffer_list_length(copy_buflist); frame_number++) {
         GstBuffer *buffer = gst_buffer_list_get(copy_buflist,
frame_number);

        // Set the timestamp for the buffer
        GST_BUFFER_TIMESTAMP(buffer) = timestamp_ns;

        // Increment the timestamp for the next frame
        timestamp_ns += frame_duration_ns;

        // Push the buffer into the pipeline
        gst_app_src_push_buffer(GST_APP_SRC(appsrc), buffer);
    }

   // retval = gst_app_src_push_buffer_list(GST_APP_SRC(appsrc),
copy_buflist);
    g_print("RETVAL %d\n", retval);
    g_print("Sending EOS!!!!!!!");
    g_signal_emit_by_name(appsrc, "end-of-stream", &retval);
}

Can you please provide a solution on my problem.

Regards,

Sulthan
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