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• How can twisted spawnProcess send ffmpeg filter_complex parameters with embedded quotes ?

  19 août 2024, par Stephen

  I am attempting to send these (simplified) parameters to ffmpeg via reactor.spawnProcess.

  


  ['-filter_complex', '"[0:v]setpts=PTS-STARTPTS,scale=-1:720 [a0];[a0]pad=w=1280:h=720:x=-1:y=-1:color=black[out]"'


  


  but presumedly code is doing some form of prefixing which ffmpeg can't understand because my filter graph always errors although I can send my exact same text to ffmpeg on command line and it's fine.

  


  I've attempted to repr and escape ('"') and I can't figure out how to get these strings through to ffmpeg.

  


  Edit : Don't know why I didn't try before but I wrote a little script to receive the input parameters and they're fine. Still at a loss to understand why " ".join(params) will run from terminal but it fails in spawnProcess.

  


  Edit : ffmpeg output

  


  Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-v' ... matched as option 'v' (set logging level) with argument 'verbose'.
Reading option '-threads' ... matched as AVOption 'threads' with argument 'auto'.
Reading option '-flags' ... matched as AVOption 'flags' with argument '-global_header'.
Reading option '-i' ... matched as input url with argument 'config/colorbars.jpg'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option '-tag:v' ... matched as option 'tag' (force codec tag/fourcc) with argument 'hvc1'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '"[0:v]setpts=(RTCTIME-RTCSTART)/(TB*1000000),scale=-1:720[outpad];[outpad]pad=w=1280:h=720:x=-1:y=-1:color=black[out]"'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '"[out]"'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'hevc_videotoolbox'.
Reading option '-b:v' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '3000K'.
Reading option '-preset' ... matched as AVOption 'preset' with argument 'medium'.
Reading option '-profile:v' ... matched as option 'profile' (set profile) with argument 'main'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv420p'.
Reading option '-t' ... matched as option 't' (record or transcode "duration" seconds of audio/video) with argument '5'.
Reading option 'temp/apptest_1.mp4' ... matched as output url.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option v (set logging level) with argument verbose.
Input #0, image2, from 'config/colorbars.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 4712 kb/s
  Stream #0:0: Video: mjpeg (Baseline), 1 reference frame, yuvj420p(pc, bt470bg/unknown/unknown, center), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn
[AVFilterGraph @ 0x600001fbc600] No such filter: '"'
Error initializing complex filters.
Invalid argument


  


  Solution : The problem always solves when requesting assistance. Every example at ffmpeg wiki shows double quotes around the filter graph. When sending with spawnProcess this is unnecessary.

  


• RTSP Server send and receive rtsp stream

  12 octobre 2016, par Aleksandr Yarushevsky

  I have RTMP stream source that I need to send to my server (Janus WebRTC Gateway).

  Receive RTMP and produce RTSP I am doing with Nginx-rtmp using FFmpeg.

  Then I need to receive RTSP stream and give the possibility to get that stream by URL.

  General schema like this :
  [Teradek]---(rtmp)--->[RTMP Server (nginx-trmp) - convert rtmp to rtsp] ---(rtsp)--->[RTSP Server]<---(rtsp)---[Janus]

  Help me with RTSP Server, what server I can choose for simply receive RTSP stream and produce URL to access that stream.

• Use ffmpeg to send custom header for RTSP session

  29 janvier 2020, par senojsitruc

  I am trying to use the ffmpeg library (not the command line) to open an RTSP stream and push that stream to a server. In ONVIF parlance, this is a backchannel (for sending audio to a camera).

  Where I am stuck is in sending a custom header (Require: ...) with the DESCRIBE command, and being able to handle the reply.

  Is there a way to do this with ffmpeg ?

  DESCRIBE rtsp://192.168.0.1 RTSP/1.0 CSeq: 1
  
  User-Agent: ONVIF Rtsp client Accept: application/sdp
  
  Require: www.onvif.org/ver20/backchannel

  I noticed in rtsp.c that there are various *_rtsp_send_cmd_*() functions that look interesting, but they all appear to be private to the library.