Bug Report: Unable to Convert H264 Encoded Buffer to MP4 File

[Sulthan Amanu]

Fwd..

On Wed, 4 Oct 2023 at 19:35, Sulthan Amanu <sulthan4380 at gmail.com> wrote:

> Dear Team,
>
> I have encountered an issue while attempting to convert an H264 encoded
> buffer to an MP4 file using the appsrc element. Unfortunately, I am unable
> to successfully perform this conversion, and I have attached the relevant
> pipeline and code snippet for your reference:
>
> *Pipeline:*
>
> gst-launch-1.0 -e v4l2src device="/dev/video0" ! videoconvert ! queue !
> x264enc tune=zerolatency ! identity ! fakesink
>
>
> I'm utilizing the `identity` element to capture the buffers and store them
> in a buffer list. Subsequently, I am using the following code snippet to
> convert the H264 encoded buffer to an MP4 file:
>
> *Code Snippet:*
>
> void convertToMP4(GstBufferList *buflist)
> {
>     // Create pipeline for MP4 conversion.
>     GstElement *pipeline, *appsrc, *videoconvert, *x264enc, *h264parse,
> *videoencode, *muxer, *file_sink;
>     pipeline = gst_pipeline_new("MP4-pipeline");
>     appsrc = gst_element_factory_make("appsrc", "source");
>     h264parse = gst_element_factory_make("h264parse", "app-h264parse");
>     muxer = gst_element_factory_make("mp4mux", "mux");
>     file_sink = gst_element_factory_make("filesink", "filesink");
>
>     g_object_set(G_OBJECT(appsrc),
>                  "stream-type", 0,
>                  "format", GST_FORMAT_TIME, NULL);
>
>     g_object_set(muxer, "fragment-duration", 2000, NULL);
>     // g_object_set(h264parse, "config-interval", -1, NULL);
>     // g_object_set(x264enc, "tune", 4, NULL);
>
>     // Set the resolution and framerate caps
>     GstCaps *caps = gst_caps_new_simple("video/x-h264",
>                                         "stream-format", G_TYPE_STRING,
> "byte-stream",
>                                         "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_AUDIO.mp4", NULL);
>
>     gst_bin_add_many(GST_BIN(pipeline), appsrc, h264parse, muxer,
> file_sink, NULL);
>     if (gst_element_link_many(appsrc, h264parse, muxer, 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));
>     // Set the pipeline to the PLAYING state.
>     gst_element_set_state(pipeline, GST_STATE_PLAYING);
>
>     // Push video and audio buffers into appsrc.
>     GstFlowReturn retval =
> gst_app_src_push_buffer_list(GST_APP_SRC(appsrc), copy_buflist);
>     if (retval != GST_FLOW_OK) {
>         g_printerr("Error pushing buffers to appsrc: %s\n",
> gst_flow_get_name(retval));
>         // Handle error and cleanup if needed.
>     }
>
>     bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
>     gst_bus_add_signal_watch(bus);
>     g_signal_connect(bus, "message::error", G_CALLBACK(cb_message_error),
> NULL);
>     g_signal_connect(bus, "message::eos", G_CALLBACK(cb_message_eos),
> NULL);
> }
>
> However, I am encountering the following error:
>
>
> *ERROR*
>
> is buffered is filled, and the Buffer size is 70
>
> MP4 converted /n0:00:08.391637077 18811 0x7fcd6c0040f0 FIXME default
> gstutils.c:3981:gst_pad_create_stream_id_internal:<source:src> Creating a
> random stream-id; consider implementing a deterministic way of creating a
> stream-id
>
> I kindly request your assistance in resolving this issue promptly. Your
> guidance in rectifying this problem will be greatly appreciated.
>
> Best Regards,
> Sulthan
>
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