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I have a security camera streaming RTSP, and I wish to re-stream this to an RTMP ingest server. For now I’m using my laptop as an ffmpeg proxy, but eventually I’ll use a raspberry pi or something similar (cheap/small)

Here’s the command I’m using (pretty simple) :

ffmpeg -i rtsp://@10.0.0.16:554/1/h264major -c:v libx264 -c:a none -f flv rtmp://output/camera_stream

This works but after a minute or two the stream dies. Here’s the output :

ffmpeg version N-90057-g7c82e0f Copyright (c) 2000-2018 the FFmpeg developers

  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.6) 20160609

  configuration: --prefix=/home/sbarnett/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/sbarnett/ffmpeg_build/include --extra-ldflags=-L/home/sbarnett/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/sbarnett/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libspeex --enable-nonfree

  libavutil      56.  7.101 / 56.  7.101

  libavcodec     58. 11.101 / 58. 11.101

  libavformat    58.  9.100 / 58.  9.100

  libavdevice    58.  1.100 / 58.  1.100

  libavfilter     7. 12.100 /  7. 12.100

  libswscale      5.  0.101 /  5.  0.101

  libswresample   3.  0.101 /  3.  0.101

  libpostproc    55.  0.100 / 55.  0.100

Input #0, rtsp, from 'rtsp://@10.0.0.16:554/1/h264major':

  Metadata:

    title           : h264major

    comment         : h264major

  Duration: N/A, start: 0.360000, bitrate: N/A

    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 720x480, 25 fps, 25 tbr, 90k tbn, 50 tbc

Stream mapping:

  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))

Press [q] to stop, [?] for help

[libx264 @ 0x38843c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2

[libx264 @ 0x38843c0] profile High, level 3.0

[libx264 @ 0x38843c0] 264 - core 155 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00

Output #0, flv, to 'rtmp://output/camera_stream':

  Metadata:

    title           : h264major

    comment         : h264major

    encoder         : Lavf58.9.100

    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuvj420p(pc), 720x480, q=-1--1, 25 fps, 1k tbn, 25 tbc

    Metadata:

      encoder         : Lavc58.11.101 libx264

    Side data:

      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1

Past duration 0.999992 too large

    Last message repeated 29 times

[rtsp @ 0x3847600] max delay reached. need to consume packet

[rtsp @ 0x3847600] RTP: missed 48 packets

Past duration 0.999992 too large

    Last message repeated 4 times

frame=   44 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=5 speed=   0x    

frame=   57 fps= 54 q=28.0 size=      43kB time=00:00:00.16 bitrate=2186.4kbits/s dup=0 drop=5 speed=0.153x    

... (lots of similar messages) ...   

frame= 1163 fps= 26 q=28.0 size=    1341kB time=00:00:44.84 bitrate= 245.0kbits/s dup=0 drop=5 speed=0.99x    

frame= 1177 fps= 26 q=28.0 size=    1353kB time=00:00:45.40 bitrate= 244.2kbits/s dup=0 drop=5 speed=0.99x    

[rtsp @ 0x3847600] max delay reached. need to consume packet

[rtsp @ 0x3847600] RTP: missed 2 packets

frame= 1190 fps= 26 q=28.0 size=    1370kB time=00:00:45.92 bitrate= 244.4kbits/s dup=0 drop=5 speed=0.99x    

[h264 @ 0x38c08c0] Increasing reorder buffer to 1

frame= 1201 fps= 26 q=28.0 size=    1381kB time=00:00:46.36 bitrate= 244.0kbits/s dup=0 drop=5 speed=0.989x    

frame= 1214 fps= 26 q=28.0 size=    1393kB time=00:00:46.88 bitrate= 243.4kbits/s dup=0 drop=5 speed=0.989x    

... (lots of similar messages) ...    

frame= 1761 fps= 25 q=28.0 size=    2030kB time=00:01:08.80 bitrate= 241.7kbits/s dup=0 drop=5 speed=0.993x    

frame= 1774 fps= 25 q=28.0 size=    2041kB time=00:01:09.32 bitrate= 241.2kbits/s dup=0 drop=5 speed=0.993x    

[flv @ 0x3884900] Failed to update header with correct duration.

[flv @ 0x3884900] Failed to update header with correct filesize.

frame= 1782 fps= 25 q=-1.0 Lsize=    2127kB time=00:01:11.64 bitrate= 243.2kbits/s dup=0 drop=5 speed=1.02x    

video:2092kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.679417%

[libx264 @ 0x38843c0] frame I:8     Avg QP:16.89  size: 42446

[libx264 @ 0x38843c0] frame P:1672  Avg QP:19.54  size:  1065

[libx264 @ 0x38843c0] frame B:102   Avg QP:23.00  size:   205

[libx264 @ 0x38843c0] consecutive B-frames: 92.4%  0.0%  0.0%  7.6%

[libx264 @ 0x38843c0] mb I  I16..4: 12.9% 36.2% 50.9%

[libx264 @ 0x38843c0] mb P  I16..4:  0.2%  0.2%  0.0%  P16..4: 16.7%  0.7%  1.0%  0.0%  0.0%    skip:81.1%

[libx264 @ 0x38843c0] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8: 11.7%  0.1%  0.0%  direct: 1.5%  skip:86.5%  L0:62.2% L1:35.3% BI: 2.5%

[libx264 @ 0x38843c0] 8x8 transform intra:40.8% inter:47.4%

[libx264 @ 0x38843c0] coded y,uvDC,uvAC intra: 46.5% 53.0% 17.2% inter: 3.9% 8.7% 0.0%

[libx264 @ 0x38843c0] i16 v,h,dc,p: 21% 56%  8% 15%

[libx264 @ 0x38843c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 33% 31%  1%  2%  3%  2%  2%  3%

[libx264 @ 0x38843c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 39%  9%  3%  3%  4%  5%  3%  8%

[libx264 @ 0x38843c0] i8c dc,h,v,p: 43% 33% 21%  3%

[libx264 @ 0x38843c0] Weighted P-Frames: Y:0.0% UV:0.0%

[libx264 @ 0x38843c0] ref P L0: 88.0%  1.4%  6.6%  4.0%

[libx264 @ 0x38843c0] ref B L0: 99.4%  0.5%  0.1%

[libx264 @ 0x38843c0] ref B L1: 99.4%  0.6%

[libx264 @ 0x38843c0] kb/s:238.73

The camera is pretty cheap (from China) so it’s likely I’m getting bad data from it or it’s cutting out for a few seconds at a time. Ideally I would need ffmpeg to handle this well (ignore bad data, wait as long as necessary for good data to resume encoding)

Using ffplay to check out the RTSP stream, I get output like the following :

$> ffplay -i rtsp://@10.0.0.16:554/1/h264major

ffplay version N-90057-g7c82e0f Copyright (c) 2003-2018 the FFmpeg developers

  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.6) 20160609

  configuration: --prefix=/home/sbarnett/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/sbarnett/ffmpeg_build/include --extra-ldflags=-L/home/sbarnett/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/sbarnett/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libspeex --enable-nonfree

  libavutil      56.  7.101 / 56.  7.101

  libavcodec     58. 11.101 / 58. 11.101

  libavformat    58.  9.100 / 58.  9.100

  libavdevice    58.  1.100 / 58.  1.100

  libavfilter     7. 12.100 /  7. 12.100

  libswscale      5.  0.101 /  5.  0.101

  libswresample   3.  0.101 /  3.  0.101

  libpostproc    55.  0.100 / 55.  0.100

Input #0, rtsp, from 'rtsp://@10.0.0.16:554/1/h264major':0B f=0/0

  Metadata:

    title           : h264major

    comment         : h264major

  Duration: N/A, start: 0.320000, bitrate: N/A

    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 720x480, 25 fps, 25 tbr, 90k tbn, 50 tbc

[swscaler @ 0x7f6bbc093180] deprecated pixel format used, make sure you did set range correctly

[rtsp @ 0x7f6bc0000940] max delay reached. need to consume packet

[rtsp @ 0x7f6bc0000940] RTP: missed 2 packets

[h264 @ 0x7f6bc0041080] error while decoding MB 44 28, bytestream -37

[h264 @ 0x7f6bc0041080] concealing 95 DC, 95 AC, 95 MV errors in I frame

[rtsp @ 0x7f6bc0000940] max delay reached. need to consume packet

[rtsp @ 0x7f6bc0000940] RTP: missed 1 packets

[h264 @ 0x7f6bc0041080] error while decoding MB 43 29, bytestream -49

[h264 @ 0x7f6bc0041080] concealing 51 DC, 51 AC, 51 MV errors in I frame

[rtsp @ 0x7f6bc0000940] max delay reached. need to consume packet

[rtsp @ 0x7f6bc0000940] RTP: missed 2 packets

[h264 @ 0x7f6bc0041080] Increasing reorder buffer to 1

[rtsp @ 0x7f6bc0000940] max delay reached. need to consume packet

[rtsp @ 0x7f6bc0000940] RTP: missed 3 packets

[h264 @ 0x7f6bc02c3600] error while decoding MB 27 29, bytestream -24

[h264 @ 0x7f6bc02c3600] concealing 67 DC, 67 AC, 67 MV errors in I frame

[rtsp @ 0x7f6bc0000940] max delay reached. need to consume packet

[rtsp @ 0x7f6bc0000940] RTP: missed 2 packets

[rtsp @ 0x7f6bc0000940] max delay reached. need to consume packet

[rtsp @ 0x7f6bc0000940] RTP: missed 42 packets

[rtsp @ 0x7f6bc0000940] max delay reached. need to consume packet

[rtsp @ 0x7f6bc0000940] RTP: missed 2 packets

Then eventually the video just freezes. The first time it froze after around 5 minutes, but I wasn’t able to say definitively if it froze the instant 44 packets were dropped or if it froze randomly later. So the second time I stared intently.... for 21 minutes. Then I got bored of it not freezing, turned to pet my cat, and when I looked back 15 seconds later it was frozen. I think it only breaks when no one is watching it.

What I can say definitively is :

• While running normally, M-V hovers around 0 (anywhere between -0.01 and +0.01)
• Once frozen, M-V begins to count down into negative numbers without stopping - although at a rate slower than -1 per second
• While running normally, aq is 0KB and vq is a positive number (I think it was 30KB or so ?)
• Once frozen, vq is also 0KB

It’s a really cheap camera with a crummy power supply that goes out if you breathe on it, so it’s likely the camera is going temporarily offline during this time — but I’d like ffmpeg to wait out a timeout and resume streaming when it sees the camera again.