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• How do I save `RTSP` streams as `*.mp4` files in Golang ? [closed]

  14 septembre 2021, par Clancy Zeng

  I need to use Golang to save the data from the RTSP stream to a *.mp4 video file for a specified length of time.

  


  I wanted to install an FFmpeg application and then call a command like this from Golang to solve my needs.

  


  


  ffmpeg -i rtsp ://192.168.108.132:8554/profile0 -r 16 -tt 60 /tmp/test.mp4

  


  


  But installing FFMPEG takes up hundreds of megabytes of space.So this idea was rejected by the leadership.

  


  Is there a pure Golang implementation library that can address my needs ?Or is there a golang-only library that parses RTSP streams and saves them as *.MP4 video files ?

  


• How to save a vvideo from a RTSP server using Ffmpeg in C++ ?

  20 septembre 2021, par Tolga

  I am using Ffmpeg remuxing example code to save a mp4 file into another file. However my actual goal is saving the video from a RTSP server. The example works fine with the normal .mp4 files but when I try to save the video from RTSP Server I get following error on command prompt.

  


  [mp4 @ 02F9A8C0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 18000 >= 3000


  


  The RTSP server is created on my computer for testing using python gstream. I used the script here.

  


  Ffmpeg code in C++ is below where error occurs.

  


          iCamera->stream = iCamera->fmt->streams[iCamera->pkt->stream_index];
        iCamera->pkt->stream_index = map->stream_map[iCamera->pkt->stream_index];
        oCamera->stream = oCamera->fmt->streams[iCamera->pkt->stream_index];

        iCamera->pkt->pts = av_rescale_q_rnd(iCamera->pkt->pts, iCamera->stream->time_base, oCamera->stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
        iCamera->pkt->dts = av_rescale_q_rnd(iCamera->pkt->dts, iCamera->stream->time_base, oCamera->stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
        iCamera->pkt->duration = av_rescale_q(iCamera->pkt->duration, iCamera->stream->time_base, oCamera->stream->time_base);
        iCamera->pkt->pos = -1;
        
        if (av_interleaved_write_frame(oCamera->fmt, iCamera->pkt)) {
            printf("Error occured while muxing packet.\n"); exit(1);
        }


  


• How to save synthesized audio during streaming distribution

  7 avril 2022, par its-ogawa

  I would like to stream a composite of microphone audio and digital sound sources by ffmpeg and save the delivery to an m3u8 file.

  


  Below are the commands I have actually tried.

  


  ffmpeg -rtbufsize 100M -f dshow -i video=<my webcam="webcam">:audio=<my microphone="microphone"> -re -stream_loop -1 -i <my sound="sound" source="source"> -filter_complex "[0]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=2100|2100,volume@voice=volume=10dB[voice],[1]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,azmq,volume@bgm=volume=0.2[bgm],[voice][bgm]amerge=inputs=2[out]" -map 0:v -map [out]:a -f mpegts -flush_packets 0 udp://XXX.XXX.XXX.XXX:XXX?pkt_size=1316 -f hls -hls_time 5 hls.m3u8&#xA;</my></my></my>

  


  I have played an m3u8 created this way, but I cannot hear the digital sound source that I am supposed to have synthesized.
Even though the synthesized audio was audible when streamed.

  


  Perhaps you need to set up something like -map 0:v -map [out]:a when saving to the m3u8 file, in which case the Output with label 'out' does not exist in any defined filter graph, or was already used elsewhere. message appears and does not work.