[FFmpeg-user] udp streaming transrate

celon ulzii.ict at gmail.com
Thu Mar 20 09:47:35 CET 2014

hi all,

I'm using ffmpeg for transrate (down rate) UDP stream CLI is below:

ffmpeg -f mpegts -i
'udp://' -acodec aac
-strict experimental -ar 44100 -ac 2 -b:a 48k -vcodec h264 -pix_fmt yuv420p
-profile:v main -s 640x480 -b:v 500k -f mpegts 'udp://'

    Last message repeated 1 times
[h264 @ 0x2346060] decode_slice_header error
[h264 @ 0x2346060] no frame!
[h264 @ 0x2346060] Missing reference picture, default is 6
[h264 @ 0x2346060] decode_slice_header error
[h264 @ 0x2346060] number of reference frames (0+5) exceeds max (4; probably
corrupt input), discarding one
Input #0, mpegts, from
  Duration: N/A, start: 28093.147811, bitrate: 48 kb/s
  Program 1 
    Stream #0:0[0x121]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuvj420p(pc, bt470bg), 528x576 [SAR 16:11 DAR 4:3], 25 fps, 50 tbr, 90k tbn,
50 tbc
    Stream #0:1[0x122]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, mono,
s16p, 48 kb/s
[swscaler @ 0x231b0c0] deprecated pixel format used, make sure you did set
range correctly
[libx264 @ 0x23509a0] using SAR=1/1
[libx264 @ 0x23509a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1
[libx264 @ 0x23509a0] profile Main, level 3.0
Output #0, mpegts, to 'udp://':
    encoder         : Lavf55.34.101
    Stream #0:0: Video: h264 (libx264), yuv420p, 640x480 [SAR 1:1 DAR 4:3],
q=-1--1, 500 kb/s, 90k tbn, 25 tbc
    Stream #0:1: Audio: aac, 44100 Hz, stereo, fltp, 48 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (mp2 -> aac)
Press [q] to stop, [?] for help
[mp2 @ 0x2346b20] Header missing
Error while decoding stream #0:1: Invalid data found when processing input
[adts @ 0x2b9b3e0] Encoder did not produce proper pts, making some up.
frame=  375 fps= 28 q=32.0 size=    1156kB time=00:00:14.32 bitrate=
661.1kbits/s dup=46 drop=0 

I occurs above errors and it's streaming but seems can't join my multicast
group properly. please give your kind suggestion 

thank very much

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