diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 8fec18deee..a71f98145c 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -122,6 +122,7 @@ typedef struct AVFormatParameters {
 #define AVFMT_RAWPICTURE    0x0020 /* format wants AVPicture structure for
                                       raw picture data */
 #define AVFMT_GLOBALHEADER  0x0040 /* format wants global header */
+#define AVFMT_NOTIMESTAMPS  0x0080 /* format doesnt need / has any timestamps */
 
 typedef struct AVOutputFormat {
     const char *name;
diff --git a/libavformat/raw.c b/libavformat/raw.c
index 752dbf0931..2edf1cd2d7 100644
--- a/libavformat/raw.c
+++ b/libavformat/raw.c
@@ -423,6 +423,7 @@ AVOutputFormat flac_muxer = {
     flac_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -449,6 +450,7 @@ AVOutputFormat ac3_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -498,6 +500,7 @@ AVOutputFormat h261_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -525,6 +528,7 @@ AVOutputFormat h263_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -552,6 +556,7 @@ AVOutputFormat m4v_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -579,6 +584,7 @@ AVOutputFormat h264_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -605,6 +611,7 @@ AVOutputFormat mpeg1video_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -620,6 +627,7 @@ AVOutputFormat mpeg2video_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -659,6 +667,7 @@ AVOutputFormat mjpeg_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -690,6 +699,7 @@ AVOutputFormat pcm_ ## name ## _muxer = {\
     raw_write_header,\
     raw_write_packet,\
     raw_write_trailer,\
+    .flags= AVFMT_NOTIMESTAMPS,\
 };
 
 
@@ -786,6 +796,7 @@ AVOutputFormat rawvideo_muxer = {
     raw_write_header,
     raw_write_packet,
     raw_write_trailer,
+    .flags= AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
 
@@ -810,6 +821,6 @@ AVOutputFormat null_muxer = {
     raw_write_header,
     null_write_packet,
     raw_write_trailer,
-    .flags = AVFMT_NOFILE | AVFMT_RAWPICTURE,
+    .flags = AVFMT_NOFILE | AVFMT_RAWPICTURE | AVFMT_NOTIMESTAMPS,
 };
 #endif //CONFIG_MUXERS
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 451706dcc6..5e00bb33dd 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2402,7 +2402,7 @@ int av_write_frame(AVFormatContext *s, AVPacket *pkt)
     int ret;
 
     ret=compute_pkt_fields2(s->streams[pkt->stream_index], pkt);
-    if(ret<0)
+    if(ret<0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
         return ret;
 
     truncate_ts(s->streams[pkt->stream_index], pkt);
@@ -2509,7 +2509,7 @@ int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
         return 0;
 
 //av_log(NULL, AV_LOG_DEBUG, "av_interleaved_write_frame %d %Ld %Ld\n", pkt->size, pkt->dts, pkt->pts);
-    if(compute_pkt_fields2(st, pkt) < 0)
+    if(compute_pkt_fields2(st, pkt) < 0 && !(s->oformat->flags & AVFMT_NOTIMESTAMPS))
         return -1;
 
     if(pkt->dts == AV_NOPTS_VALUE)