Nginx MP4 streaming

Have problem with mp4 streaming, flv working fine and can seek in player, but when i try seek mp4 in firebug have internal 500 error...

here is my nginx.conf

location ~* \.(png|jpg|jpeg|gif)(\?ver=[0-9.]+)?$ {
root /home/xxx/public_html/media;
access_log off;
log_not_found off;
expires 30d;
}
location ~\.mp4$ {
secure_link $arg_st,$arg_e;
secure_link_md5 segredo$uri$arg_e;
if ($secure_link = "") {
return 403;
}
if ($secure_link = "0") {
return 403;
}
gzip off;
root /home/xxx/public_html/media;
limit_rate_after 10m;
limit_rate 400k;
#internal;
mp4;
mp4_buffer_size 1m;
mp4_max_buffer_size 5m;
}

location ~ \.flv$ {
secure_link $arg_st,$arg_e;
secure_link_md5 segredo$uri$arg_e;
if ($secure_link = "") {
return 403;
}
if ($secure_link = "0") {
return 403;
}
gzip off;
root /home/xxx/public_html/media;
limit_rate_after 10m;
limit_rate 400k;
#internal;
flv;
}


In log im found only this 2013/07/05 01:16:50 [error] 2224#0: *481 start time is out mp4 stts samples in "/home/xxx/public_html/media/videos/0613/2808363858/06132808363858.mp4",

Any help where can be problem? im aslo try same video to stream via apache, video is working fine, so its not corrupted!