I have several IPCams from different manufacturers. All of them transmit
audio/video stream through a well-known RTSP URL.
They can use different video codecs, mainly H.264 or H.265 (in some
cases, MJPEG for low resolution streams).
Also audio codecs are different: G.711a, G.711u, AAC, G.726, MP3, PCM,
MP2L2 and so on.
I'm trying to use ffmpeg to receive streams from those IPCams. I'm using
segment muxer to keep always a certain number of segments in memory,
that is what I need. I finally reached the following command line:
ffmpeg -hide_banner -rtsp_transport tcp -stimeout 10000000 -i <rtsp
addr> -f segment -segment_time 2 -reset_timestamps 1 -segment_wrap 11 -c
copy %d.<output format>
ffmpeg runs on a small embedded Linux box based on iMX6ULL CPU. It isn't
a powerful CPU, so I'd like to use "-c copy" to avoid overloading the
CPU when transcoding 10 streams at the same time.
Now the problem is the output format to use (the muxer?).
I started with mp4, but it doesn't support G.711 and similar audio codecs.
I tried with mkv, but ffmpeg exits with error for some IPCams, because
it couldn't find timestamps. The error is:
[matroska @ 000001e89e880e00] Can't write packet with unknown timestamp
av_interleaved_write_frame(): Invalid argument
frame= 3 fps=0.0 q=-1.0 Lsize=N/A time=00:00:00.12 bitrate=N/A
speed=48.2x
video:56kB audio:1kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: unknown
Conversion failed!
I tried to fix this error with '-fflags +genpts' and other solutions I
found on the web, without success.
So I tried mov and it appears to work for all my IPCams, but I'm
wondering if it will work for other IPCams I will use.
First question: could ffmpeg save the stream in a "raw" format as it is
received from RTSP, without too much problems? I don't need to play the
video continuously, only when I want. Only at that moment, I could use
ffmpeg to join segments and transcode to mp4. In this case the
transcoding is limited in time and only for short videos.
Second question: is there another media container format that could be
better to use in my situation?
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