[FFmpeg-user] timeout error when reading RTSP/RTP incoming audio stream

[Yannick Barbeaux]

On Tue, Jun 16, 2020 at 9:45 AM Yannick Barbeaux <ybarbeaux at gmail.com>
wrote:

> On Mon, 15 Jun 2020 at 09:37, Yannick Barbeaux
> <yannick.barbeaux at keemotion.com> wrote:
> >
> > Hello
> > I am struggling to read a multicast audio RTP stream controlled by RTSP.
> As
> > soon as I launch the ffplay or ffmpeg command, the RTP traffic starts
> > (tcpdump) on port 5004/UDP (as advertised in the SDP file), so it should
> > read the stream correctly but I finally get a time-out instead (and empty
> > out file). The very same RTSP URL can be read without any issue with VLC
> or
> > with rtpdump+sox.
> >
> > $ ffmpeg -y -rtsp_transport udp_multicast -i "rtsp://
> > 192.168.2.148:554/by-name/AES67-stream (on hasseb-AoE-F8-82)" -vn -f
> s24le
> > -ar 48000 -c:a pcm_s24be out.raw
> > ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
> >   built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
> >   configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --disable-debug
> > --enable-nonfree --enable-gpl --enable-version3
> --enable-libopencore-amrnb
> > --enable-libopencore-amrwb --disable-decoder=amrnb
> --disable-decoder=amrwb
> > --enable-libpulse --enable-libfreetype --enable-gnutl
> > s --enable-libdav1d --enable-libx264 --enable-libx265 --enable-libfdk-aac
> > --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx
> > --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
> > --enable-libxvid --enable-libvidstab --enable-libtheora --en
> > able-libwavpack --enable-libopenjpeg --enable-libgsm --enable-nvenc
> > --enable-libzimg --enable-libaom
> >   libavutil      56. 31.100 / 56. 31.100
> >   libavcodec     58. 54.100 / 58. 54.100
> >   libavformat    58. 29.100 / 58. 29.100
> >   libavdevice    58.  8.100 / 58.  8.100
> >   libavfilter     7. 57.100 /  7. 57.100
> >   libswscale      5.  5.100 /  5.  5.100
> >   libswresample   3.  5.100 /  3.  5.100
> >   libpostproc    55.  5.100 / 55.  5.100
> > Guessed Channel Layout for Input Stream #0.0 : stereo
> > Input #0, rtsp, from 'rtsp://192.168.2.148:554/by-name/AES67-stream (on
> > hasseb-AoE-F8-82)':
> > Metadata:
> >     title           : AES67-stream (on hasseb-AoE-F8-82) streamed by
> > "hasseb"
> >   Duration: N/A, bitrate: 2304 kb/s
> >     Stream #0:0: Audio: pcm_s24be, 48000 Hz, stereo, s32 (24 bit), 2304
> kb/s
> > Stream mapping:
> >   Stream #0:0 -> #0:0 (pcm_s24be (native) -> pcm_s24be (native))
> > Press [q] to stop, [?] for help
> > rtsp://192.168.2.148:554/by-name/AES67-stream (on hasseb-AoE-F8-82):
> > Connection timed out
> > Output #0, s24le, to 'out.raw':
> >   Metadata:
> >     title           : AES67-stream (on hasseb-AoE-F8-82) streamed by
> > "hasseb"
> >     encoder         : Lavf58.29.100
> >     Stream #0:0: Audio: pcm_s24be, 48000 Hz, stereo, s32 (24 bit), 2304
> kb/s
> >     Metadata:
> >       encoder         : Lavc58.54.100 pcm_s24be
> > size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
> > video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> > muxing overhead: unknown
> > Output file is empty, nothing was encoded (check -ss / -t / -frames
> > parameters if used)
> >
> > The SDP file is :
> >
> > v=0
> > o=- 254522267104 0 IN IP4 192.168.2.148
> > s=AES67-stream (on hasseb-AoE-F8-82) streamed by "hasseb"
> > t=0 0
> > a=clock-domain:PTPv2 0
> > a=recvonly
> > m=audio 5004 RTP/AVP 98
> > c=IN IP4 239.123.123.123/255
> > a=rtpmap:98 L24/48000/2
> > a=sync-time:0
> > a=framecount:48
> > a=source-filter: incl IN IP4 239.123.123.123 192.168.2.148
> > a=ts-refclk:ptp=IEEE1588-2008:00-10-4b-ff-fe-2e-f8-82:domain-nmbr=0
> > a=mediaclk:direct=0
> > a=ptime:1
> >
> > Comparing those files, we see that ffmpeg detects the correct
> > audio settings (pcm_s24be, 48000 Hz, stereo, s32 (24 bit)) so I cannot
> > figure out why it can't read the data stream? I have tried to increase
> the
> > timeout but that did not help.
> >
> > Any help would be appreciated. Thank you.
> >
> > Yannick
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>
> My apologies to everyone for multi-posting this question. My question
> did not appear in the list after two days so I tried multiple times,
> thinking it had been considered as spam or something. Then I noticed
> the question appeared three times in the ffmpeg-user archives, sorry.
> (Strange thing though : "Receive your own posts to the list?" is set
> to "Yes" in my subscription settings and I do not receive them).
> Cheers
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".


I will rephrase my question in a short way : does ffmpeg support AES67 as
an input ?