Changing filesink location after a mux with many inputs.
Angel Martin
amartin at vicomtech.org
Wed Jun 5 00:43:04 PDT 2013
Hi,
To fully understand the elements/pads structure the right schedule is:
// Pipeline -> src -> dynamic pipeline
// Pipeline -> capsfilter(f264file) -> mp4mux(mux0)
-> filesink(fsink0)
// Pipeline -> elem_BEFORE||blockpad| ->
|elem_CUR_sinkpad||elem_CUR||elem_CUR_srcpad ->
|elem_AFTER_sinkpad||elem_AFTER
Best,
Angel
2013/6/4 Angel Martin <amartin at vicomtech.org>
> Dear all,
>
> I did not achieve to create full legible muxed files for Gstreamer 0.10 on
> top of multifilesink or output-selector.
>
> After analysing lots of alternatives my solution takes as code base the
> example depicted in:
>
> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-dynamic-pipelines.html
>
> The probes function API has been changed a bit but the solution below
> works to create every N seconds different MP4 files:
>
> static GstElement *pipeline = NULL;
>
> // Pipeline -> src -> dynamic pipeline
> // Pipeline -> capsfilter(f264file) -> mp4mux(mux0)
> -> filesink(fsink0)
> // Pipeline -> elem_before||blockpad| ->
> |elem_cur_sinkpad||elem_cur||elem_cur_srcpad -> |elem_cur_sinkpad||elem_cur
> static gulong probe_id; // probe ID
> static GstElement *elem_before; // SRC of dynamic pipeline
> static GstElement *elem_after; // SINK of dynamic pipeline
> static GstElement *elem_cur; // Main element of dynamic pipeline
> static GstPad *blockpad; // SRC pad to be blocked
> static GstPad *elem_cur_srcpad; // SRC pad where check EOS
> static GstPad *elem_cur_sinkpad; // SINK of dynamic pipeline
> static GstPad *elem_after_sinkpad; // SINK of SINK element
>
> // Last Buffer Timestamp
> static GstClockTime last_ts = 0;
>
> typedef enum {
> NO_NEW_FILE, // Keep current file destination
> NEW_FILE, // Switch file destination
> } NewFileStatus;
> static NewFileStatus newfile = NO_NEW_FILE; // Switch File Flag
>
> static int counter = 1; // Index filename
>
> // EOS listener to switch to other file destination
> static gboolean
> event_probe_cb (GstPad * pad, GstEvent * event, gpointer user_data)
> {
> g_print ("INSIDE event_probe_cb:%d type:%s\n",probe_id,
> GST_EVENT_TYPE (event)==GST_EVENT_EOS?"EOS":GST_EVENT_TYPE
> (event)==GST_EVENT_NEWSEGMENT?"NEWSEGMENT":"OTHER");
>
> if (GST_EVENT_TYPE (event) != GST_EVENT_EOS)
> {
> // Push the event in the pipe flow (false DROP)
> return TRUE;
> }
> // remove the probe first
> gst_pad_remove_event_probe (pad, probe_id);
>
> gst_object_unref (elem_cur_srcpad);
> gst_object_unref (elem_after_sinkpad);
> gst_element_release_request_pad(elem_cur, elem_cur_sinkpad);
>
> gst_element_set_state (elem_cur, GST_STATE_NULL);
> gst_element_set_state (elem_after, GST_STATE_NULL);
>
> // remove unlinks automatically
> GST_DEBUG_OBJECT (pipeline, "removing %" GST_PTR_FORMAT, elem_cur);
> gst_bin_remove (GST_BIN (pipeline), elem_cur);
> GST_DEBUG_OBJECT (pipeline, "removing %" GST_PTR_FORMAT, elem_after);
> gst_bin_remove (GST_BIN (pipeline), elem_after);
>
> GstElement * mux0 = gst_element_factory_make("mp4mux", "mux0");
> GstElement * fsink0 = gst_element_factory_make("filesink", "fsink0");
> elem_cur = mux0;
> elem_after = fsink0;
>
> if(!mux0 || !fsink0)
> {
> printf("mising elements\n");
> }
>
> GST_DEBUG_OBJECT (pipeline, "adding %" GST_PTR_FORMAT, elem_cur);
> gst_bin_add (GST_BIN (pipeline), elem_cur);
> GST_DEBUG_OBJECT (pipeline, "adding %" GST_PTR_FORMAT, elem_after);
> gst_bin_add (GST_BIN (pipeline), elem_after);
>
> char buffer[128];
> sprintf(buffer, "test_%d.mp4", counter++);
> g_print ("File Switching %s\n", buffer);
> g_object_set(G_OBJECT(elem_after), "location", buffer, NULL);
>
> GST_DEBUG_OBJECT (pipeline, "linking..");
> elem_cur_srcpad = gst_element_get_static_pad (elem_cur, "src");
> elem_cur_sinkpad = gst_element_get_request_pad (elem_cur, "video_%d");
> elem_after_sinkpad = gst_element_get_static_pad (elem_after, "sink");
>
> if(gst_pad_link(blockpad, elem_cur_sinkpad) != GST_PAD_LINK_OK)
> {
> printf("linking output 0 failed\n");
> return -1;
> }
> if(gst_pad_link(elem_cur_srcpad, elem_after_sinkpad) != GST_PAD_LINK_OK)
> {
> printf("linking output 1 failed\n");
> return -1;
> }
>
> g_print ("Moving to PLAYING\n");
> gst_element_set_state (elem_cur, GST_STATE_PLAYING);
> gst_element_set_state (elem_after, GST_STATE_PLAYING);
>
> GST_DEBUG_OBJECT (pipeline, "done");
>
> newfile = NO_NEW_FILE;
> // Push the event in the pipe flow (false DROP)
> return TRUE;
> }
>
> // Check if Buffer contains a KEY FRAME
> static gboolean
> is_sync_frame (GstBuffer * buffer)
> {
> if (GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT))
> {
> return FALSE;
> }
> else if (!GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_IN_CAPS))
> {
> return TRUE;
> }
> }
>
> // Block source and launch EOS to MUXER to achieve a full muxed file
> static gboolean
> pad_probe_cb (GstPad * pad, GstBuffer * buffer, gpointer user_data)
> {
> g_print ("\n\tINSIDE pad_probe_cb:%d %s %s\n",probe_id,
> (newfile?"newfile":"thesame"),
> (is_sync_frame (buffer)?"KEYframe":"frame"));
> GST_DEBUG_OBJECT (pad, "pad is blocked now");
>
> last_ts = GST_BUFFER_TIMESTAMP(buffer);
> if(!GST_CLOCK_TIME_IS_VALID(last_ts))
> last_ts=0;
>
> if((newfile==NO_NEW_FILE) || !is_sync_frame (buffer))
> return TRUE;
>
> /* remove the probe first */
> gst_pad_remove_buffer_probe (pad, probe_id);
>
> /* install new probe for EOS */
> probe_id = gst_pad_add_event_probe (elem_after_sinkpad,
> G_CALLBACK(event_probe_cb), user_data);
>
> /* push EOS into the element, the probe will be fired when the
> * EOS leaves the effect and it has thus drained all of its data */
> gst_pad_send_event (elem_cur_sinkpad, gst_event_new_eos ());
>
> // Wait til the EOS have been processed the Buffer with the Key frame
> will be the FIRST
> while(newfile != NO_NEW_FILE)
> Sleep(1);
>
> // Push the buffer in the pipe flow (false DROP)
> return TRUE;
> }
>
> // this timeout is periodically run as part of the mainloop
> static gboolean timeout (gpointer user_data)
> {
> g_print ("TIMEOUT\n");
> if(!playing)
> return false;
> newfile = NEW_FILE;
> /* install new probe for Keyframe and New File */
> probe_id = gst_pad_add_buffer_probe (blockpad, G_CALLBACK(pad_probe_cb),
> pipeline);
> return true;
> }
>
> Best,
>
> Angel
>
> 2012/10/19 Paddy <pat.blanchon at gmail.com>
>
>> Paddy wrote
>> > More progress ...
>> >
>> > I've recovered the 1.3sec of missing video. This is what I now do when I
>> > want to change the filesink location on the fly:
>> > 1) install/enable a handoff function on an identity element inserted
>> > between the x264enc & videoQ elements which simply looks for keyframes
>> > (see above pipeline).
>> > 2) when a keyframe is detected block both queue src pads & disable the
>> > handoff
>> > 3) in the first blocked callback, unlink the mux/sink bin from both
>> > queues & send an EOS event to the audio & video sink pads in the
>> mux/sink
>> > bin. I have to do this - without the EOS I never see the second
>> callback.
>> > I can also confirm that both EOS's find their way to the mux/sink bin -
>> I
>> > missed them in the yards of debug
>> > 4) on the second callback a new mux/sink bin is created, added & synced
>> > to the pipeline & the queues are unblocked
>> > 5) the mux/file bin EOS handler function sets the retiring bin state to
>> > NULL & removes it from the pipeline
>> >
>> > Hopefully this may help others who want to try this.
>> >
>> > Meanwhile I still have a couple of questions:
>> >
>> > Is the missing second block callback expected behaviour or a bug ? I
>> never
>> > see the second callback unless I send the EOS event.
>> >
>> > Bug or not: is the above procedure sound ? I'm new to gstreamer & don't
>> > have much of a grip on its architecture, design & implementation; so
>> > there's everything chance what I'm doing is fundamentally flawed.
>> >
>> > Cheer again
>>
>>
>> Bumping this up so hopefully my questions can be considered.
>>
>> I'll dig some sample code out that shows the pertinent steps for those
>> gents
>> that have asked
>>
>>
>>
>> --
>> View this message in context:
>> http://gstreamer-devel.966125.n4.nabble.com/Changing-filesink-location-after-a-mux-with-many-inputs-tp4656116p4656654.html
>> Sent from the GStreamer-devel mailing list archive at Nabble.com.
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>
>
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