[Libav-user] get mpeg4 streams with rtsp protocol

[Vicente Fernandes]

2011/6/15 luke <lclemens at gmail.com>

> I'm having this same problem with two axis ip cameras and two panasonic ip
> cameras!! The video gets messed up with ghosting and other artifacts,
> especially in the lower half. The console spits out hundreds of errors each
> minute.
>
> To reproduce the error, go to: http://ffmpeg.zeranoe.com/builds/ and get
> the
> latest 32 bit static build for, (the one I have is 1929807). Then open a IP
> camera rtsp stream via ffplay. If you don't have one, I found one that's
> accessible online that you can access using:
>
> ffplay rtsp://195.200.199.8/mpeg4/media.amp
>
> There will be a lot of errors in the output console for ffplay.
>
> A few years ago we used some older versions that didn't have any mpeg4
> errors, but they had another problem that caused the video to timeout after
> 1 minute. So it seems like the timeout problem was fixed, but replaced by
> this mpeg4 issue. There is a post in the ffmpeg group that describes the
> same issue. And another one here:
> http://web.archiveorange.com/archive/v/yR2T4qtfjQ1es89IeoVN .
>
> It's not just ffplay either. I tried it with several example apps like the
> ffmpeg sdl tutorial here: http://dranger.com/ffmpeg/ and my own code -
> they
> all get the same mpeg4 errors. The common code for these apps is based on
> av_open_input_file(), av_find_stream_info(), and av_read_frame().
>
> I've tried it on several different windows computers. I'm going to try it
> on
> Ubuntu tonight.
>
> Is there a chance that perhaps we just need a certain flag or option
> enabled?
>
> I will look into the source code and see if I can find the bug, but I'm
> pretty new with mpeg4 codec specifics so it would help a lot if someone can
> give me a better idea of where to look. I don't even know where to begin -
> the rtp parsing or the mpeg4 decompression?
>
> BTW, the errors I'm getting look like:
>
> C:\ffmpeg\bin>ffplay rtsp://195.200.199.8/mpeg4/media.amp
> ffplay version git-N-30344-g5501afa, Copyright (c) 2003-2011 the FFmpeg
> develope
> rs
>  built on May 27 2011 22:37:57 with gcc 4.5.3
>  configuration: --enable-gpl --enable-version3 --enable-memalign-hack
> --enable-
> runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r
> --enable-libo
> pencore-amrnb --enable-libopencore-amrwb --enable-libfreetype
> --enable-libgsm --
> enable-libmp3lame --enable-libopenjpeg --enable-librtmp
> --enable-libschroedinger
>  --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx
> --enabl
> e-libx264 --enable-libxavs --enable-libxvid --enable-zlib
> --pkg-config=pkg-confi
> g
>  libavutil    51.  2. 2 / 51.  2. 2
>  libavcodec   53.  6. 0 / 53.  6. 0
>  libavformat  53.  2. 0 / 53.  2. 0
>  libavdevice  53.  0. 0 / 53.  0. 0
>  libavfilter   2. 11. 0 /  2. 11. 0
>  libswscale    0. 14. 0 /  0. 14. 0
>  libpostproc  51.  2. 0 / 51.  2. 0
> [rtsp @ 01E57B60] Estimating duration from bitrate, this may be inaccurate
> Input #0, rtsp, from 'rtsp://195.200.199.8/mpeg4/media.amp':
>  Metadata:
>    title           : Media Presentation
>  Duration: N/A, start: 0.030000, bitrate: N/A
>    Stream #0.0: Video: mpeg4, yuv420p, 352x288 [PAR 12:11 DAR 4:3], 100
> tbr, 90
> k tbn, 100 tbc
> [mpeg4 @ 01E5BA40] ac-tex damaged at 16 4B vq=   17KB sq=    0B f=0/0
> [mpeg4 @ 01E5BA40] Error at MB: 108
> [mpeg4 @ 01E5BA40] concealing 44 DC, 44 AC, 44 MV errors
> [mpeg4 @ 01E5BA40] 1. marker bit missing in 3. esc=    0B f=0/0
> [mpeg4 @ 01E5BA40] Error at MB: 61
> [mpeg4 @ 01E5BA40] concealing 110 DC, 110 AC, 110 MV errors
> [mpeg4 @ 01E5BA40] concealing 49 DC, 49 AC, 49 MV errorsB f=0/0
> [mpeg4 @ 01E5BA40] ac-tex damaged at 12 9   0KB sq=    0B f=0/0
> [mpeg4 @ 01E5BA40] Error at MB: 219
> [mpeg4 @ 01E5BA40] concealing 44 DC, 44 AC, 44 MV errors
> [mpeg4 @ 01E5BA40] ac-tex damaged at 4 7    0KB sq=    0B f=0/0
> [mpeg4 @ 01E5BA40] Error at MB: 165
> [mpeg4 @ 01E5BA40] concealing 66 DC, 66 AC, 66 MV errors
> [mpeg4 @ 01E5BA40] concealing 30 DC, 30 AC, 30 MV errorsB f=0/0
> [mpeg4 @ 01E5BA40] ac-tex damaged at 5 5    0KB sq=    0B f=0/0
> [mpeg4 @ 01E5BA40] Error at MB: 120
> [mpeg4 @ 01E5BA40] concealing 287 DC, 287 AC, 287 MV errors
> ...........
> ...........
> and billions more errors like that :-)
>
> --
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> http://libav-users.943685.n4.nabble.com/get-mpeg4-streams-with-rtsp-protocol-tp2256170p3600630.html
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Hi,

if you add ?tcp in the end of URL I think that many of your problems are
solved..

ffplay rtsp://195.200.199.8/mpeg4/media.amp?tcp
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