<div dir="ltr">I am using GStreamer 1.6.3, Centos 4.7.5<div><div> </div><div>It may be a local problem as the test program you provided gave me the same error message:</div><div><div>Failed converting frame.</div><div>Error : Cannot find any image encoder for caps image/bmp</div></div><div> </div><div>I was able to build my own pipeline and save an image, essentially using the same code as gst_video_convert_sample</div><div>and the other routines below that. In build_convert_frame_pipeline, for the get_encoder part, I used </div><div> </div><div>GstElementFactory *bitmap_factory = gst_element_factory_find("avenc_bmp");</div><div>GstElement *encoder = gst_element_factory_create(bitmap_factory, "bitmap_elem");</div><div> </div><div>Then I used encoder as it already appeared in build_convert_frame_pipeline.</div></div><div> </div><div>I am going to test with some newer versions of GStreamer, but I had hoped to keep 1.6.3 as it has proven to be</div><div>very stable for my applications.</div><div> </div></div><div class="gmail_extra"> <div class="gmail_quote">On Fri, Dec 29, 2017 at 5:37 AM, Antonio Ospite <<a href="mailto:ao2@ao2.it" target="_blank">ao2@ao2.it</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Wed, 27 Dec 2017 11:06:58 -0700 (MST) jackson80 <<a href="mailto:jackstuff3@gmail.com">jackstuff3@gmail.com</a>> wrote: > Looking at gst_video_convert_sample: It first validates inputs and extracts > caps from src; then it calls build_convert_frame_pipepline. This routine > creates elements needed for a conversion pipeline. Then this routine calls > get_encoder. This immediately calls gst_element_factory_list_get_elements. > From the debug output supplied by gst_plugin_feature_list_debug, I can see > the only encoders found were jpegenc, pngenc, and pnmenc. Since none of > these encoders match bmp, this is where it fails. > Is there any other way to see if libav is correctly incorporated with the > rest of the gstreamer software? > Or do you think I should try manually building a conversion pipeline? > A simplified version of your test program works here (Debian unstable, GStreamer 1.12.4) and can save bmp files using gst_video_convert_sample(), so you might be experiencing a local problem. IIRC we didn't ask the usual questions: what GStreamer version? What system? I am pasting the test program below: /* * Compile with: * gcc -ggdb test.c $(pkg-config --cflags --libs gstreamer-1.0 gstreamer-video-1.0 gtk+-3.0) */ #include <gtk/gtk.h> #include <gst/gst.h> #include <gst/video/video.h> /* Structure to contain all our information, so we can pass it around */ typedef struct CustomData { GstElement *pipeline; GstElement *source; GstElement *sink; GstElement *convert; GstElement *caps; GstState state; GstStateChangeReturn ret; } CustomData; void save_images_cb(GtkWidget *widget, CustomData *data) { int i; GstCaps *caps; GstSample *from_sample, *to_sample; GError *err = NULL; GstBuffer *buf; GstMapInfo map_info; char pic_location[50], command_string[256]; g_object_get(data->sink, "last-sample", &from_sample, NULL); if (from_sample == NULL) { printf("Failed getting sample.\n"); return; } caps = gst_caps_from_string ("image/bmp"); if (caps == NULL) { printf("Failed getting caps.\n"); return; } to_sample = gst_video_convert_sample (from_sample, caps, GST_CLOCK_TIME_NONE, &err); gst_caps_unref (caps); gst_sample_unref (from_sample); if (to_sample == NULL && err) { printf("Failed converting frame.\n"); printf("Error : %s\n", err->message); return; } sprintf(pic_location,"/tmp/sample_a.bmp"); buf = gst_sample_get_buffer(to_sample); if (gst_buffer_map (buf,&map_info, GST_MAP_READ)) { if (!g_file_set_contents(pic_location, (const char *) map_info.data, map_info.size, &err)){ printf("Could not save image %i.\n", i); } } gst_sample_unref (to_sample); } int main(int argc, char *argv[]) { CustomData data; GstStateChangeReturn ret; GtkButton *temp_button; GtkWidget *vid_window, *main_window, *big_window, *button_window, *pic_button; int mkdir_status, wd; GstCaps *caps; int i; /* Initialize GTK */ gtk_init (&argc, &argv); /* Initialize GStreamer */ gst_init (&argc, &argv); main_window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_container_set_border_width(GTK_CONTAINER(main_window),0); g_signal_connect (G_OBJECT (main_window), "delete-event", G_CALLBACK (gtk_main_quit), NULL); gtk_window_set_default_size (GTK_WINDOW (main_window), 900, 600); gtk_window_set_title(GTK_WINDOW(main_window), "Test Program"); big_window = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0); pic_button = gtk_button_new_with_label("Save Image"); g_signal_connect(G_OBJECT(pic_button), "clicked", G_CALLBACK(save_images_cb), (gpointer)&data); button_window = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0); gtk_box_pack_start (GTK_BOX(button_window), pic_button, FALSE, FALSE, 0); data.pipeline = gst_pipeline_new("video-pipeline"); data.source = gst_element_factory_make ("videotestsrc", "play1"); data.sink = gst_element_factory_make ("gtksink", "sink1"); /* gst_base_sink_set_last_sample_enabled(GST_BASE_SINK(data.sink),TRUE);*/ data.convert = gst_element_factory_make ("videoconvert", "convert1"); data.caps = gst_element_factory_make ("capsfilter", "caps1"); caps = gst_caps_from_string("video/x-raw,width=800,height=480,framerate=25/1"); g_object_set(G_OBJECT(data.caps), "caps", caps, NULL); gst_caps_unref(caps); if ((!data.pipeline) || (!data.source) || (!data.sink) || (!data.caps) || (!data.convert)){ g_printerr ("Not all elements could be created.\n"); return 0; } gst_bin_add_many (GST_BIN (data.pipeline), data.source, data.caps, data.convert, data.sink, NULL); gst_element_link_many(data.source, data.caps, data.convert, data.sink, NULL); g_object_get (data.sink, "widget", &vid_window, NULL); gtk_box_pack_start (GTK_BOX(big_window), vid_window, FALSE, FALSE, 0); gtk_box_pack_start (GTK_BOX(big_window), button_window, FALSE, FALSE, 0); gtk_container_add (GTK_CONTAINER (main_window), big_window); gtk_widget_show_all(main_window); ret = gst_element_set_state(data.pipeline, GST_STATE_READY); if (ret == GST_STATE_CHANGE_FAILURE) { printf("Could not set pipe to ready.\n"); } else { gst_element_set_state(data.pipeline, GST_STATE_PLAYING); gtk_main (); gst_element_set_state(data.pipeline, GST_STATE_NULL); gst_object_unref(data.pipeline); gst_object_unref(data.source); gst_object_unref(data.caps); gst_object_unref(data.convert); gst_object_unref(data.sink); } return 0; <div class="HOEnZb"><div class="h5">} -- Antonio Ospite <a href="https://ao2.it" rel="noreferrer" target="_blank">https://ao2.it</a> <a href="https://twitter.com/ao2it" rel="noreferrer" target="_blank">https://twitter.com/ao2it</a> A: Because it messes up the order in which people normally read text. See <a href="http://en.wikipedia.org/wiki/Posting_style" rel="noreferrer" target="_blank">http://en.wikipedia.org/wiki/Posting_style</a> Q: Why is top-posting such a bad thing? </div></div></blockquote></div> </div>