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• ffmpeg : adding a stream non-muxed stream with correct codec type tagging

  13 janvier 2021, par Hamish

  In common use, I believe ffmpeg requires inputs to be in a specified muxer format which contains one or more data streams which can be decoded with a codec supported by the demuxer associated with the format. I have a data stream (not audio or video) which is already encoded with a codec but is not muxed. How can I get this stream into the ffmpeg pipeline with the correct codec type assigned so that the muxer knows what to do with it ?

  


  I have tried streaming the data over UDP and specifying the data demuxer. With some combinations I get get it to say it's streaming, I can never get a player to connect, presumable because the output of mpegts is either null or invalid. Command line :

  


  ffmpeg -v verbose ^
-f flv -listen 1 -i rtmp://127.0.0.1:1101 ^
-f data -i udp://127.0.0.1:1300 ^
    -map 0:v -vcodec mpeg2video -map 1:d -f mpegts -mpegts_m2ts_mode 1  udp://localhost:1200


  


  Result (partial) :

  


  Input #0, flv, from 'rtmp://127.0.0.1:1101':
  Metadata:
    encoder         : Lavf58.29.100
  Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Constrained Baseline), 1 reference frame, yuv420p(progressive, left), 5760x1080 (5760x1088), 30 fps, 30 tbr, 1k tbn, 60 tbc
    Stream #0:1: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Input #1, data, from 'udp://127.0.0.1:1300':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #1:0: Data: none
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mpeg2video (native))
  Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[h264 @ 00000180d48ae700] Reinit context to 5760x1088, pix_fmt: yuv420p
[graph 0 input from stream 0:0 @ 00000180d489dcc0] w:5760 h:1080 pixfmt:yuv420p tb:1/1000 fr:30/1 sar:0/1
[mpegts @ 00000180d5f64040] Cannot automatically assign PID for stream 1
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 --
[AVIOContext @ 00000180d48b83c0] Statistics: 0 seeks, 0 writeouts
[AVIOContext @ 00000180d4882080] Statistics: 185593 bytes read, 0 seeks
[AVIOContext @ 00000180d5f469c0] Statistics: 204 bytes read, 0 seeks
Conversion failed!


  


  The codec type name is klv, which has the tag KLVA. It is only supported by the mpegts and mxf (de)muxers. I presume there must be a way of getting into the pipeline without having a valid mpegts or mxf stream in the first place otherwise we have a kind of paradox.

  


  I've tried specifying the codec on the input, but it fails validation, I guess because the data demuxer does not support it.

  


  Somehow mp4 files can be muxed from elemental streams (h264 and aac files), but I guess there must be some special case in the code to force the codec type based on the file extension.

  


  I would really love to do this from the command line with a public build but if this is absolutely not possible, I would also welcome some advice about it could be achieved from C++ code.

  


• Connecting to RTSP stream via FFMpeg - 'could not find codec parameters for stream 0'

  14 novembre 2013, par user2992545

  I'm a beginner in the FFMpeg world, so please excuse me my overall level of knowledge and any mistakes.

  What I have here is a DVR, made by ITX Security. I have an SDK for it and currently I'm trying to connect to its RTSP using FFMPEG. I've been partially succesfull (i think), the best what I got was :

  `(...)bin>ffplay -user-agent "ITX Security" rtsp://ADMIN:1234@192.168.2.130:5554/live/
  
  
  
  [rtsp @ 02a242e0] UDP timeout, retrying with TCPB sq=0B f=0/0
  
  [rtsp @ 02a242e0] method PAUSE failed: 501 Not Implemented
  
  [rtsp @ 02a242e0] Could not find codec parameters for stream 0 (Video: h264):unspecified size Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  rtsp://ADMIN:1234@192.168.2.130:5554/live/: could not find codec parameters
  
  
  
  nan:  0.000 fd=0 aq=    0KB vq=    0KB sq=    0B f=0/0`

  Is it really indicating that it has trouble in playing the stream (because it lacks a proper codec ?) - or am I just not getting the point ?

  I've captured traffic between my computer and the DVR in question, and something is happening (at least that's what Wireshark says).

  https://www.dropbox.com/s/j65lige244kg8jt/rtsp_ffmpeg.pcap

  What am I doing wrong ?

  Regards.

• ffserver + ffmpeg, out rtsp stream : why ffplay cannot play the stream, but movie player can

  18 juillet 2014, par user1914692

  Ubuntu 12.04
  I use ffserver + ffmpeg.

  There are a little revision of the original /etc/ffserver.conf :

  RTSPPort 5454
  
  RTSPBindAddress 0.0.0.0
  
  
  
  # ...
  
  
  
  <stream>
  
  Format rtp
  
  # coming from live feed 'feed1'
  
  Feed feed1.ffm
  
  </stream>

  The command of ffmpeg (Option 1) is :

  ffmpeg -re -i '/usr/share/red5/webapps/oflaDemo/streams/hobbit_vp6.flv'  http://localhost:8090/feed1.ffm

  BTW, if I use Option 2 as below, it does not work :

  ffmpeg -re -i '/usr/share/red5/webapps/oflaDemo/streams/hobbit_vp6.flv'  http://192.168.1.105:8090/feed1.ffm
  
  ## not work:
  
  [http @ 0x21a9c80] HTTP error 404 Not Found
  
  http://192.168.1.105:8090/feed1.ffm: Input/output error

  So now I need to display the stream.
  On the other computer :

  (Option 1) ffplay rtsp://192.168.1.105:5454/test2-rtsp.mpg

  Not work. [Output] rtsp UDP timeout, retrying with TCP.
  Why ?

  (Option 2) movie player : Open location : rtsp ://192.168.1.105:5454/test2-rtsp.mpg
  it works !