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• avformat/ty : Remove write-only array and variable

  11 août 2020, par Andreas Rheinhardt

  avformat/ty : Remove write-only array and variable
  Up until now, the TiVo demuxer parse an array of SEQ entries, yet it has
  
  never ever made any use of them. In fact, parse_master, the function
  
  parsing said table, only influenced the outside world in three ways : Via
  
  an excessive amount of error message in case a certain parameter is not
  
  what it expected ; via an allocation (the aforementioned write-only
  
  array) ; and by setting a certain parameter (ty->cur_chunk_pos), but that
  
  parameter is always overwritten before it is used (it is overwritten
  
  in get_chunk() on success and if get_chunk() fails, the error is
  
  returned to the caller anyway). So remove the array and the function
  
  used to parse it.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/ty.c

• 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.

• FFmpeg send video to Virtual Cam in Windows [closed]

  30 août 2021, par Felipe Nunes

  I'm bulding a system that needs to generate a HLS and reproduces the video in browser, locally. Initially, to use HLS in browser directly causes a long delay (because of the size of slice of TS). To solve this, I thought to create a virtual cam to duplicate video signal and the browser uses this virtual cam.

  


  In Linux based systems, we can create a virtual cam using V4L2 Loopback and to define this virtual cam as output. By example :

  


  ffmpeg -f v4l2 -i /dev/video0 -vf "drawtext=text='Hello World':fontsize=12:fontcolor=white:font=Arial:x=w-tw-10:y=h-th-10,format=yuv420p" -f v4l2 /dev/video1


  


  In Windows, I could create a virtual cam using OBS Virtual Cam, but I couldn't send video to this device.

  


  ffmpeg -i teste.mp4 -f dshow video="OBS Virtual Cam"


  


  When I try to run this command, I receive this error :

  


  [NULL @ 000002a1e089d880] Requested output format 'dshow' is not a suitable output format
video=OBS Virtual Cam: Invalid argument


  


  How to send a video to a device using ffmpeg ?