Data loss in Buffer to mp4 file conversion

[Sulthan Amanu]

Hi Team,

any update regarding my query?

Regards,
Sulthan

On Wed, 6 Sept 2023 at 20:54, Sulthan Amanu <sulthan4380 at gmail.com> wrote:

> 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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