# gstreamer unable to encode from YUV images to MP4

**URL:** <https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937>\
**Category:** Jetson TX2\
**Created:** [August 8, 2018, 4:31am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937 "2018-08-08T04:31:41Z")\
**Posts on this page:** 15\
**Page:** 1

<div class="post-metadata">

**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 8, 2018, 4:31am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/1 "2018-08-08T04:31:41Z")

</div>

I needed to do the following conversion, from YUV to mp4 ,the following is a part of my code:

```auto
gboolean bus_call(GstBus *bus, GstMessage *msg, gpointer data)
{
	GMainLoop *loop = (GMainLoop *) data;
	switch (GST_MESSAGE_TYPE (msg))
	{

	case GST_MESSAGE_EOS:
		fprintf(stderr, "End of stream\n");
		g_main_loop_quit(loop);
		break;
	case GST_MESSAGE_ERROR:
	{
		gchar *debug;
		GError *error;
		gst_message_parse_error(msg, &error, &debug);
		g_free(debug);
		g_printerr("Error: %s\n", error->message);
		g_error_free(error);
		g_main_loop_quit(loop);
		break;
	}
	default:
		break;
	}
	return TRUE;
}

void PushBuffer()
{
	GstFlowReturn ret;
	GstBuffer *buffer;
	int size = FRAMELENYUV;
	GstMapInfo info;

	buffer = gst_buffer_new_allocate(NULL, size, NULL); //分配空间
	gst_buffer_map(buffer, &info, GST_MAP_WRITE);
	unsigned char* buf = info.data;
	memmove(buf, rawdata, size);
	gst_buffer_unmap(buffer, &info);
	ret = gst_app_src_push_buffer(GST_APP_SRC(source), buffer);
	if(ret < 0)
	{
		puts("############################\n");
	}
	else
	{
		;
	}
}

int factory_make()
{	

	pipeline = gst_pipeline_new("mypipeline");
	source = gst_element_factory_make("appsrc", "mysource");	
	videoparse = gst_element_factory_make("videoparse" , "myvideoparse");
	enconder = gst_element_factory_make("omxh264enc", "myencoder");
	filter1 = gst_element_factory_make ("capsfilter", "mufilter");
	parser = gst_element_factory_make ("h264parse", "myparser");
	muxer = gst_element_factory_make ("qtmux","mymuxer");	
	sink = gst_element_factory_make ("appsink","mysink");
	filter2 = gst_element_factory_make ("capsfilter", "mufilter");

	filter_caps1 = gst_caps_new_simple ("video/x-raw", "format", G_TYPE_STRING,"I420", "width",G_TYPE_INT,FRAMEWIDTH,"height",G_TYPE_INT,FRAMEHEIGHT,NULL);	
	filter_caps2 = gst_caps_new_simple ("video/x-h264", "stream-format", G_TYPE_STRING,"byte-stream", NULL);

	if(!pipeline || !source || !videoparse || !enconder || !filter1 || !filter2 ||!parser || !muxer ||!muxer || !filter_caps2 || !filter_caps1)
	{
		fprintf(stderr, "Could not gst_element_factory_make, terminating\n");
		exit(0);		
	}

	char szTemp[64];
	
	g_object_set (G_OBJECT (filter1), "caps", filter_caps1, NULL);
	g_object_set (G_OBJECT (filter2), "caps", filter_caps2, NULL);
	gst_caps_unref(filter_caps1);
	gst_caps_unref(filter_caps2);

	g_object_set(G_OBJECT (enconder), "insert-sps-pps", true , NULL);
	g_object_set(G_OBJECT (enconder), "profile", "high" , NULL);
	g_object_set(G_OBJECT(enconder) , "iframeinterval" , 15 , NULL);	
	sprintf(szTemp, "%d" , FRAMELENYUV);
	g_object_set(G_OBJECT (source), "blocksize", szTemp,NULL);
	g_object_set(G_OBJECT(videoparse) , "width" , FRAMEWIDTH , "height" , FRAMEHEIGHT , NULL);

	return 0;
}

int pipelinemake()
{	
	gst_bin_add_many(GST_BIN(pipeline), source, filter1,enconder,filter2,parser,muxer,sink, NULL);		
	gst_element_link_many(source,filter1 ,enconder, filter2,parser,muxer,sink);
	
	return 0;	
}

int watcher_make()
{
	bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
	bus_watch_id = gst_bus_add_watch(bus, bus_call, loop);
	gst_object_unref(bus);

	return 0;	
}

void *GstreamerThdFun(void *)
{
	
	gst_init(NULL, NULL);	
	
	loop = g_main_loop_new(NULL, FALSE);

	factory_make();
	watcher_make();
	pipelinemake();					
	gst_element_set_state(pipeline, GST_STATE_PLAYING);				
	g_main_loop_run(loop);											

	//release all															
	gst_element_set_state(pipeline, GST_STATE_NULL);				
	gst_object_unref(GST_OBJECT(pipeline));
	g_source_remove (bus_watch_id);
	g_main_loop_unref (loop);										
}

void *sendThdFun(void*)
{
       
    unsigned long int max_file = 1024*1024*512;
    int countnum = 0;

    while(1)
    {

	usleep(1000*5);

        GstSample* sample = gst_app_sink_pull_sample(GST_APP_SINK(source));
        if(sample != NULL)
        {
            GstBuffer* buffer = gst_sample_get_buffer (sample);
            GstMapInfo map;
            gst_buffer_map (buffer, &map, GST_MAP_READ);
			
			//存储文件
			if(storage_num>1024*1024*10)
			{
	    		fwrite(storage, sizeof(unsigned char), storage_num , fd);
				storage_num = 0;
	    	}
			else
			{
				memcpy(storage + storage_num,map.data,map.size);
				storage_num += map.size;
			}
			countnum += map.size;
			if(countnum >= max_file)
			{
				fclose(fd);				
				countnum = 0;
			}
			
	       gst_buffer_unmap (buffer, &map);
           gst_sample_unref (sample);
       }
       else
       {
		printf(" ****************************** \n");
       }
    }
}

```

when I run this program,it failed and the error message is :

gst\_app\_sink\_pull\_sample:assertion 'GST\_IS\_APP\_SINK(appsink)'falied!

---

<div class="post-metadata">

**Author:** ![DaneLLL](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/danelll/32/14043_2.png) [@DaneLLL](https://forums.developer.nvidia.com/u/DaneLLL)\
**Post date:** [August 8, 2018, 9:27am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/2 "2018-08-08T09:27:34Z")

</div>

Here is a sample of ‘appsrc&nbsp;! omxh264enc&nbsp;! qtmux&nbsp;! filesink’  
[url][What is maximum video encoding resolution in pixels? - Jetson TX2 - NVIDIA Developer Forums](https://devtalk.nvidia.com/default/topic/1015571/jetson-tx2/what-is-maximum-video-encoding-resolution-in-pixels-/post/5253760/#5253760%5B/url%5D)  
FYR

---

<div class="post-metadata">

**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 8, 2018, 12:49pm UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/3 "2018-08-08T12:49:22Z")

</div>

I mean C code not command line.

---

<div class="post-metadata">

**Author:** ![Jimmy\_Pettersson](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Jimmy\_Pettersson](https://forums.developer.nvidia.com/u/Jimmy_Pettersson)\
**Post date:** [August 8, 2018, 2:03pm UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/4 "2018-08-08T14:03:44Z")

</div>

Your using an “appsrc” element and passing it to a function that expects an “appsink”,

```auto
...
gst_app_sink_pull_sample(GST_APP_SINK(source));
...

```

It would seem you’re using the incorrect API calls for an “appsrc” element.

---

<div class="post-metadata">

**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 9, 2018, 2:38pm UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/5 "2018-08-09T14:38:42Z")

</div>

I have already fix this bug by changing source as a appsink,but it still can not work.  
I list all my code here ：

```auto
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <time.h>
#include <math.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
#include <iostream>
#include <signal.h>

#include <gst/gst.h>
#include <gst/app/gstappsrc.h>
#include <gst/app/gstappsink.h>

using namespace cv;

const unsigned int FRAMEWIDTH = 1920;								
const unsigned int FRAMEHEIGHT = 1080;	
const unsigned int FRAMELENYUV = FRAMEWIDTH * FRAMEHEIGHT ; 

static unsigned char rawdata[FRAMELENYUV];
unsigned char storage[1024*1024*150];
unsigned int storage_num = 0;

static GstElement *source;
static GstElement *filter1;
static GstCaps *filter_caps1;
static GstElement * videoparse;
static GstElement *enconder;
static GstElement *filter2;
static GstElement *parser;
static GstElement *muxer;
static GstElement *sink;
static GstCaps *filter_caps2;

GMainLoop *loop;
GstElement *pipeline ;
GstBus *bus;
guint bus_watch_id;

gint iFrame = 10;
char filename[200];
FILE *fd;

gboolean bus_call(GstBus *bus, GstMessage *msg, gpointer data)
{
	GMainLoop *loop = (GMainLoop *) data;
	switch (GST_MESSAGE_TYPE (msg))
	{

	case GST_MESSAGE_EOS:
		fprintf(stderr, "End of stream\n");
		g_main_loop_quit(loop);
		break;
	case GST_MESSAGE_ERROR:
	{
		gchar *debug;
		GError *error;
		gst_message_parse_error(msg, &error, &debug);
		g_free(debug);
		g_printerr("Error: %s\n", error->message);
		g_error_free(error);
		g_main_loop_quit(loop);
		break;
	}
	default:
		break;
	}
	return TRUE;
}

void PushBuffer()
{
	GstFlowReturn ret;
	GstBuffer *buffer;
	int size = FRAMELENYUV;
	GstMapInfo info;

	buffer = gst_buffer_new_allocate(NULL, size, NULL); 		
	gst_buffer_map(buffer, &info, GST_MAP_WRITE);
	unsigned char* buf = info.data;
	memmove(buf, rawdata, size);
	gst_buffer_unmap(buffer, &info);
	ret = gst_app_src_push_buffer(GST_APP_SRC(source), buffer);
	if(ret < 0)
	{
		puts("############################\n");
	}
	else
	{
		;
	}
}

int factory_make()
{	

	pipeline = gst_pipeline_new("mypipeline");
	source = gst_element_factory_make("appsrc", "mysource");	
	
	enconder = gst_element_factory_make("omxh264enc", "myencoder");
	filter1 = gst_element_factory_make ("capsfilter", "mufilter");
	parser = gst_element_factory_make ("h264parse", "myparser");
	muxer = gst_element_factory_make ("qtmux","mymuxer");	
	sink = gst_element_factory_make ("appsink","mysink");
	filter2 = gst_element_factory_make ("capsfilter", "mufilter");

	filter_caps1 = gst_caps_new_simple ("video/x-raw", "format", G_TYPE_STRING,"I420", "width",G_TYPE_INT,FRAMEWIDTH,"height",G_TYPE_INT,FRAMEHEIGHT,NULL);	
	filter_caps2 = gst_caps_new_simple ("video/x-h264", "stream-format", G_TYPE_STRING,"byte-stream", NULL);

	if(!pipeline || !source || !enconder || !filter1 || !filter2 ||!parser || !muxer ||!muxer || !filter_caps2 || !filter_caps1)
	{
		fprintf(stderr, "Could not gst_element_factory_make, terminating\n");
		exit(0);		
	}

		
	g_object_set (G_OBJECT (filter1), "caps", filter_caps1, NULL);
	g_object_set (G_OBJECT (filter2), "caps", filter_caps2, NULL);
	gst_caps_unref(filter_caps1);
	gst_caps_unref(filter_caps2);

	g_object_set(G_OBJECT (enconder), "insert-sps-pps", true , NULL);
	g_object_set(G_OBJECT (enconder), "profile", "high" , NULL);
	g_object_set(G_OBJECT(enconder) , "iframeinterval" , 15 , NULL);	
	
	char szTemp[64];
	sprintf(szTemp, "%d" , FRAMELENYUV);
	g_object_set(G_OBJECT (source), "blocksize", szTemp,NULL);
	g_object_set(G_OBJECT(videoparse) , "width" , FRAMEWIDTH , "height" , FRAMEHEIGHT , NULL);

	return 0;
}

int pipelinemake()
{	
	gst_bin_add_many(GST_BIN(pipeline), source, filter_caps1,enconder,filter2,parser,muxer,sink, NULL);		
	gst_element_link_many(source,filter1 ,enconder, filter2,parser,muxer,sink);
	
	return 0;	
}

int watcher_make()
{
	bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
	bus_watch_id = gst_bus_add_watch(bus, bus_call, loop);
	gst_object_unref(bus);

	return 0;	
}

void *GstreamerThdFun(void *)
{
	
	gst_init(NULL, NULL);	
	
	loop = g_main_loop_new(NULL, FALSE);

	factory_make();
	watcher_make();
	pipelinemake();					
	gst_element_set_state(pipeline, GST_STATE_PLAYING);				
	g_main_loop_run(loop);											

	//release all															
	gst_element_set_state(pipeline, GST_STATE_NULL);				
	gst_object_unref(GST_OBJECT(pipeline));
	g_source_remove (bus_watch_id);
	g_main_loop_unref (loop);										
}

void *sendThdFun(void*)
{
       
    unsigned long int max_file = 1024*1024*512;
    int countnum = 0;

    while(1)
    {

	usleep(1000*5);

        GstSample* sample = gst_app_sink_pull_sample(GST_APP_SINK(sink));
        if(sample != NULL)
        {
            GstBuffer* buffer = gst_sample_get_buffer (sample);
            GstMapInfo map;
            gst_buffer_map (buffer, &map, GST_MAP_READ);
			
		
			if(storage_num>1024*1024*10)
			{
	    		        fwrite(storage, sizeof(unsigned char), storage_num , fd);
				storage_num = 0;
	    	}
			else
			{
				memcpy(storage + storage_num,map.data,map.size);
				storage_num += map.size;
			}
			countnum += map.size;
			if(countnum >= max_file)
			{
				fclose(fd);				
				countnum = 0;
			}
			
	       gst_buffer_unmap (buffer, &map);
           gst_sample_unref (sample);
       }
       else
       {
		printf(" ****************************** \n");
       }
    }
}

void ReadFile(char* name)
{
	FILE* pFile = fopen(name, "rb");
	if(pFile == NULL)
	{
		fprintf(stderr, "Could not open input file. Exiting.\n");
		exit(-1);
	}

	if(fread(rawdata, 1, FRAMELENYUV, pFile) != FRAMELENYUV)
	{
		fclose(pFile);
		fprintf(stderr, "Could not read input file. Exiting.\n");
		exit(-1);
	}
	fclose(pFile);
}

int main()
{
   sprintf(filename,"test.mp4");
   fd = fopen(filename,"wb");
   
   pthread_t GstreamerThd;
   pthread_t sendFrameThd; 	

   
   int ret ;
   
    ret = pthread_create(&GstreamerThd, NULL,GstreamerThdFun, NULL);
    if (ret != 0)
	{
		fprintf(stderr, "GstreamerThd returned error %d\n", ret);
		exit(0);
	}
	ret = pthread_create(&sendFrameThd, NULL,sendThdFun, NULL);	
	if (ret != 0)
	{
		fprintf(stderr, "sendFrameThd returned error %d\n", ret);
		exit(0);
	}
   
   ReadFile("a.yuv");

   while(1)
    {    
		usleep(1000*5);			
		
		PushBuffer();				

    }
	

    gst_app_src_end_of_stream(GST_APP_SRC(source));
   
    return(0);	
	
}

```

Build and run it with the following message:  
GLib-GObject-WARNING \*\*: invalid unclassed pointer in cast to ‘GstAppSink’  
\*\* (videosave:1756): CRITICAL \*\*: gst\_app\_sink\_pull\_sample: assertion ‘GST\_IS\_APP\_SINK (appsink)’ failed  
CRITICAL \*\*: gst\_app\_src\_push\_buffer\_full: assertion ‘GST\_IS\_APP\_SRC (appsrc)’ failed

---

<div class="post-metadata">

**Author:** ![Jimmy\_Pettersson](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Jimmy\_Pettersson](https://forums.developer.nvidia.com/u/Jimmy_Pettersson)\
**Post date:** [August 9, 2018, 5:32pm UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/6 "2018-08-09T17:32:03Z")

</div>

You are the one sourcing the raw image, why then use an appsink?

---

<div class="post-metadata">

**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 12, 2018, 6:42am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/7 "2018-08-12T06:42:38Z")

</div>

Sorry，I really have no idea about what do you mean？Could you give me some more detail information.

---

<div class="post-metadata">

**Author:** ![Jimmy\_Pettersson](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Jimmy\_Pettersson](https://forums.developer.nvidia.com/u/Jimmy_Pettersson)\
**Post date:** [August 12, 2018, 7:31pm UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/8 "2018-08-12T19:31:55Z")

</div>

My interpretation was that your application has YUV (raw image data) and you want to encode it to MP4, correct?

If so you may use the appsrc [1] element to insert your own data into a gstreamer encoding pipeline.

[APP code + appsrc] → [parser] → [encodebin] → \*\*\*

If you need the h264 data back you may similarly use an appsink element [2]:

[APP code + appsrc] → [parser] → [encodebin] → [something] → [appsink]

[1] [appsrc](https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-plugins/html/gst-plugins-base-plugins-appsrc.html)

[2] [app](https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-appsink.html)

---

<div class="post-metadata">

**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 13, 2018, 1:36pm UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/9 "2018-08-13T13:36:51Z")

</div>

You Are right,I want to save my raw data as Mp4,and the raw data is get by reading a local picture Repeatedly!

I successfully save a .h264 file by the following pipeline:  
[appsrc]-\>[videoparse]-\>[omxh264enc]-\>[capsfilter]-\>[appsink]

However, when I change the pipeline like this:  
[appsrc]-\>[videoparse]-\>[omxh264enc]-\>[capsfilter]-\>[h264parse]-\>[qtmux]-\>[appsink]  
I set capsfilter with (“video/x-h264”, “stream-format”, G\_TYPE\_STRING,“byte-stream”, NULL)

It doesn’t work,is there something wrong?

---

<div class="post-metadata">

**Author:** ![DaneLLL](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/danelll/32/14043_2.png) [@DaneLLL](https://forums.developer.nvidia.com/u/DaneLLL)\
**Post date:** [August 14, 2018, 7:23am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/10 "2018-08-14T07:23:02Z")

</div>

Looks like ‘qtmux ! appsink’ is not supported in gstreamer:  
[url][http://gstreamer-devel.966125.n4.nabble.com/appsink-can-t-get-qtmux-streamheader-td4119740.html[/url]](http://gstreamer-devel.966125.n4.nabble.com/appsink-can-t-get-qtmux-streamheader-td4119740.html%5B/url%5D)  
[url][http://gstreamer-devel.966125.n4.nabble.com/mp4mux-amp-appsink-td4676469.html#a4676475[/url]](http://gstreamer-devel.966125.n4.nabble.com/mp4mux-amp-appsink-td4676469.html#a4676475%5B/url%5D)

We always run ‘qtmux ! fliesink’. Not sure but seems like you have to implement seeking in appsink for ‘qtmux ! appsink’

---

<div class="post-metadata">

**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 14, 2018, 7:37am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/11 "2018-08-14T07:37:51Z")

</div>

Thus,you meand I need to change my pipeline to:  
[appsrc]-\>[videoparse]-\>[omxh264enc]-\>[capsfilter]-\>[h264parse]-\>[qtmux]-\>[filesink]

Can I change to save .avi from YUV?

---

<div class="post-metadata">

**Author:** ![Jimmy\_Pettersson](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Jimmy\_Pettersson](https://forums.developer.nvidia.com/u/Jimmy_Pettersson)\
**Post date:** [August 14, 2018, 9:06am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/12 "2018-08-14T09:06:44Z")

</div>

‘qtmux’ merges streams (audio and video) into QuickTime(.mov) files.

Are you sure you need the ‘qtmux’ element for your specific application?

> [@](#):
>
> Can I change to save .avi from YUV?

Yes, If you use the above pipeline with a filesink above you should be able to save it as .mov or .avi and any reasonable videoplayer should be able to playback the H264 encoded content.

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<div class="post-metadata">

**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 17, 2018, 9:40am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/13 "2018-08-17T09:40:24Z")

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I want to realize a screen record module and there is no audio.  
Could you show me some code example or give me some instrcuctions on that.

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**Author:** ![chay1991](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chay1991](https://forums.developer.nvidia.com/u/chay1991)\
**Post date:** [August 17, 2018, 10:18am UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/14 "2018-08-17T10:18:14Z")

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I am puzzled that can I use a pipeline like :  
[appsrc]-\>[videoparse]-\>[omxh264enc]-\>[filesink]

appsrc get data by pushbufffer.

Shold appsrc used with sppsink and filesrc with filesink?

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**Author:** ![DaneLLL](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/danelll/32/14043_2.png) [@DaneLLL](https://forums.developer.nvidia.com/u/DaneLLL)\
**Post date:** [August 17, 2018, 12:30pm UTC](https://forums.developer.nvidia.com/t/gstreamer-unable-to-encode-from-yuv-images-to-mp4/63937/15 "2018-08-17T12:30:34Z")

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For screen record, you can refer to  
[https://devtalk.nvidia.com/default/topic/1001636/](https://devtalk.nvidia.com/default/topic/1001636/)

filesrc/filesink/appsrc/appsink are all independent and not required to be used together.

Your questions are purely about gstreamer and we suggest you go to  
[http://gstreamer-devel.966125.n4.nabble.com](http://gstreamer-devel.966125.n4.nabble.com)