how to remove audio from live stream
Marianna Smidth Buschle
msb at qtec.com
Wed Sep 15 09:35:21 UTC 2021
So if I understand correctly:
[1] gst-launch-1.0 srtsrc uri=srt://:55556?mode=listener ! filesink
location=out.raw -e
[2] gst-launch-1.0 srtsrc uri=srt://:55556?mode=listener ! srtsink
uri=srt://:33334
[3] gst-launch-1.0 srtsrc uri=srt://:55556?mode=listener ! tsdemux !
queue ! video/x-h264 ! h264parse ! mpegtsmux name=mux ! filesink
location=out.raw -e
[4] gst-launch-1.0 srtsrc uri=srt://:55556?mode=listener ! tsdemux !
queue ! video/x-h264 ! h264parse ! mpegtsmux name=mux ! srtsink
uri=srt://:33334
Running: "vlc out.raw" with the files saved by either [1] or [3] works fine?
That is what I expect, since there is no "magic" it is just MPEG-TS
files and VLC should indeed handle them with no problem.
However running: "vlc srt://<IP>:33334" while having [2] or [4] doesn't
work?
Here I don't really know how good is VLC support for SRT.
I personally can't get it to work with SRT streams on my Debian...
Does VLC work with the input stream (srt://<IP>:55556)?
Can you play your stream with gstreamer?
gst-launch-1.0 srtsrc uri=srt://<IP>:33334 ! decodebin ! autovideosink
As a test you can also try changing to RTP, since that should work with VLC:
- Send with
gst-launch-1.0 srtsrc uri=srt://:55556?mode=listener ! rtpmp2tpay !
rtpbin ! udpsink port=7000 host=127.0.0.1 sync=0
- Receive it:
vlc rtp://@:7000
udpsrc address=127.0.0.1 port=7000 !
application/x-rtp,media=video,payload=33,clock-rate=90000,encoding-name=MP2T
! rtpbin ! rtpmp2tdepay ! decodebin ! autovideosink
Best Regards
Marianna
On 15.09.2021 11.05, Marc wrote:
>> Well, it takes a bit of time to learn the tricks ;)
> Yes, I was watching these quite helpfull videos yesterday
> https://www.youtube.com/watch?v=OkOsm9FyzdM
> https://youtu.be/ZphadMGufY8?t=2293
> https://youtu.be/ZphadMGufY8?t=3530
>
>
>> I would recommend looking into gst-shark, it is also a very useful debug
>> tool.
> Yes, I saw it indeed. I already asked them if it would be possible to use something like influx/prometheus to report to so it is easier and quicker to create graphs.
>
>
>> From the CAPS you can see it is a mpegts stream and that tsdemux is
>> used.
>>
>> So you just need to do what you tried with qtdemux, but use tsdemux
>> instead.
>>
>> And if you have issues you can try adding a h264parse between tsdemux
>> and the new muxer.
>>
> I have written the output of this working pipeline to a file[1]
>
> gst-launch-1.0 srtsrc uri=srt://:55556?mode=listener ! filesink location=out.raw -e
>
> If I compare it with the output[2] of this pipeline that is not playing in vlc (only changing srtsink to filesink). It looks like it has been working all along. One can notice the audio track is gone. Strange thing is, if I download this file, I can play it vlc. So I do not really get why it is not streaming in vlc.
> I thought maybe it is related to not having an audio stream, so I added a 'fake' silent stream with gstreamer, but that one also does not stream in vlc.
>
> gst-launch-1.0 srtsrc uri=srt://:55556?mode=listener ! tsdemux ! queue ! video/x-h264 ! h264parse ! mpegtsmux name=mux ! srtsink uri=srt://:33334
>
>
>
> [2]
> [@test2 /]# mediainfo out.raw
> General
> ID : 1 (0x1)
> Complete name : out.raw
> Format : MPEG-TS
> File size : 8.29 MiB
> Duration : 32 s 65 ms
> Overall bit rate mode : Variable
> Overall bit rate : 2 167 kb/s
> FileExtension_Invalid : ts m2t m2s m4t m4s tmf ts tp trp ty
>
> Video
> ID : 65 (0x41)
> Menu ID : 1 (0x1)
> Format : AVC
> Format/Info : Advanced Video Codec
> Format profile : High 4:4:4 Predictive at L3
> Format settings : CABAC / 4 Ref Frames
> Format settings, CABAC : Yes
> Format settings, Reference frames : 4 frames
> Codec ID : 27
> Duration : 32 s 98 ms
> Bit rate : 2 048 kb/s
> Width : 640 pixels
> Height : 480 pixels
> Display aspect ratio : 4:3
> Frame rate : 30.000 FPS
> Color space : YUV
> Chroma subsampling : 4:4:4
> Bit depth : 10 bits
> Scan type : Progressive
> Bits/(Pixel*Frame) : 0.222
> Stream size : 7.88 MiB (95%)
> Writing library : x264 core 157 r2980 34c06d1
> Encoding settings : 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=4 / threads=3 / 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=300 / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=cbr / mbtree=1 / bitrate=2048 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=81 / qpstep=4 / vbv_maxrate=2048 / vbv_bufsize=1228 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00
> Color range : Limited
> Color primaries : BT.601 NTSC
> Transfer characteristics : BT.601
> Matrix coefficients : BT.601
>
>
> [1]
> General
> ID : 1 (0x1)
> Complete name : out.raw
> Format : MPEG-TS
> File size : 1.96 MiB
> Duration : 7 s 133 ms
> Overall bit rate mode : Variable
> Overall bit rate : 2 281 kb/s
> FileExtension_Invalid : ts m2t m2s m4t m4s tmf ts tp trp ty
>
> Video
> ID : 65 (0x41)
> Menu ID : 1 (0x1)
> Format : AVC
> Format/Info : Advanced Video Codec
> Format profile : High 4:4:4 Predictive at L3
> Format settings : CABAC / 4 Ref Frames
> Format settings, CABAC : Yes
> Format settings, Reference frames : 4 frames
> Codec ID : 27
> Duration : 4 s 100 ms
> Bit rate : 2 072 kb/s
> Width : 640 pixels
> Height : 480 pixels
> Display aspect ratio : 4:3
> Frame rate : 30.000 FPS
> Color space : YUV
> Chroma subsampling : 4:4:4
> Bit depth : 10 bits
> Scan type : Progressive
> Bits/(Pixel*Frame) : 0.225
> Stream size : 1.01 MiB (52%)
> Color range : Limited
> Color primaries : BT.601 NTSC
> Transfer characteristics : BT.601
> Matrix coefficients : BT.601
>
> Audio
> ID : 66 (0x42)
> Menu ID : 1 (0x1)
> Format : AC-3
> Format/Info : Audio Coding 3
> Commercial name : Dolby Digital
> Codec ID : 129
> Duration : 7 s 140 ms
> Bit rate mode : Constant
> Bit rate : 96.0 kb/s
> Channel(s) : 1 channel
> Channel layout : C
> Sampling rate : 44.1 kHz
> Frame rate : 28.711 FPS (1536 SPF)
> Compression mode : Lossy
> Delay relative to video : -62 ms
> Stream size : 83.7 KiB (4%)
> Service kind : Complete Main
--
Best regards / Med venlig hilsen
“Marianna Smidth Buschle”
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