Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly I am using below command to push the video to Wowza server, since we are pushing raw H.264 video, the RTP packet does not have the timestamp,  and we could observe audio video sync issue while playing video using VLC Media Player. While executing the FFmpeg command, there is a warning showing as 


  [rtsp @ 0xb754bda0] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly


IS there any option available in FFmpeg to add timestamp in RTP packet and push the video and audio?

$ffmpeg -f h264 -i /tmp/enc_sd_stream.h264 -f aac -i /tmp/aud_rec_stream  -acodec copy -vcodec copy -r 23 -f rtsp 
 rtsp://shafi:shafi@192.168.1.135:1935/live/myStream

Input #0, h264, from '/tmp/enc_sd_stream.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuv420p, 720x576, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Input #1, aac, from '/tmp/aud_rec_stream':
  Duration: N/A, bitrate: 57 kb/s
    Stream #1:0: Audio: aac (LC), 32000 Hz, mono, fltp, 57 kb/s
[udp @ 0xb7553290] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0xb7553320] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0xb754c520] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0xb758d670] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
Output #0, rtsp, to 'rtsp://shafi:shafi@192.168.1.135:1935/live/myStream':
  Metadata:
    encoder         : Lavf57.25.100
    Stream #0:0: Video: h264, yuv420p, 720x576, q=2-31, 25 fps, 25 tbr, 90k tbn, 15 tbc
    Stream #0:1: Audio: aac (LC), 32000 Hz, mono, 57 kb/s
Stream mapping:
  Stream #0:0 -&gt; #0:0 (copy)
  Stream #1:0 -&gt; #0:1 (copy)
Press [q] to stop, [?] for help
[h264 @ 0xb752e2b0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)

    [rtsp @ 0xb754bda0] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly

[aac @ 0xb75f7880] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
frame=10213 fps= 14 q=-1.0 Lsize=N/A time=00:06:48.80 bitrate=N/A speed=0.574x
The usual solution for this situation: -fflags +genpts

It should eliminate the warning, but there's no guarantee your sync issues will be solved.