[FFmpeg-user] Problems dumping H264 stream from Axis camera

[paulj at fastmail.es]

Hi all:

	I'm trying to dump the H264 stream from an Axis M-1011 camera to disk. I used to 
have a ffmpeg binary compiled from around a year ago, and this command line used to work:


	ffmpeg -t 00:00:30 -f rtsp -i rtsp://root:root@192.168.1.129:554/axis-
media/media.amp?streamprofile=Quality?tcp -vcodec copy -acodec copy axis.mp4


	However, yesterday I downloaded the newest git source and compiled it, and with the 
new binary I get this error:


[paulo at webserver ~]$ ffmpeg -t 00:00:30 -rtsp_transport tcp -i 
rtsp://root:root@192.168.1.129:554/axis-media/media.amp?streamprofile=Quality?tcp -
vcodec copy -acodec copy axis.mp4
ffmpeg version N-43821-gf92f493 Copyright (c) 2000-2012 the FFmpeg developers
  built on Aug 23 2012 12:47:11 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-50)
  configuration: --enable-encoder=libx264 --enable-libx264 --enable-runtime-cpudetect --
enable-libmp3lame --enable-gpl
  libavutil      51. 70.100 / 51. 70.100
  libavcodec     54. 54.100 / 54. 54.100
  libavformat    54. 25.104 / 54. 25.104
  libavdevice    54.  2.100 / 54.  2.100
  libavfilter     3. 13.100 /  3. 13.100
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[rtsp @ 0xa9445c0] Estimating duration from bitrate, this may be inaccurate
Input #0, rtsp, from 'rtsp://root:root@192.168.1.129:554/axis-
media/media.amp?streamprofile=Quality?tcp':
  Metadata:
    title           : Media Presentation
  Duration: N/A, start: 0.099878, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuvj420p, 640x480 [SAR 1:1 DAR 4:3], 30 tbr, 90k 
tbn, 180k tbc
-t is not an input option, keeping it for the next output; consider fixing your command line.
Output #0, mp4, to 'axis.mp4':
  Metadata:
    title           : Media Presentation
    encoder         : Lavf54.25.104
    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuvj420p, 640x480 [SAR 1:1 DAR 4:3], 
q=2-31, 90k tbn, 90k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[mp4 @ 0xaa897a0] pts (0) < dts (1) in stream 0
av_interleaved_write_frame(): Invalid argument


	After searching for a bit, I get that the "pts < dts" error happens with B-frames being 
sent out of order (so to speak) in the H264 stream. What I don't understand is why it used to 
work before, and it doesn't now.
	I also found someone on the net who suggested using "-vcodec libx264" instead. This 
way it works, but if I'm not mistaken, using this ffmpeg would be reencoding the video stream 
coming from the camera, instead of just dumping it unmodified, and I'd rather not do that.

	Thanks for any suggestions,


                                  Paulo.

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"Oh, don't worry kids. Most of you will
never fall in love. You'll just marry
for fear of dying alone."

                             The Simpsons.
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