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• Can't get ffmpeg to stream webcam [on hold]

  29 novembre 2017, par joey

  I have a rapsberry with ffmpeg installed and a microsoft hd3000 cam installed
  I run the following command :
  ffserver -f /etc/ffserver.conf & ffmpeg -framerate 21 -re -f video4linux2 -i /dev/video0 -f alsa -i sysdefault:CARD=HD3000 http://localhost:8090/feed1.ffm

  and i get the following :

  /etc/ffserver.conf:164: Setting default value for video bit rate tolerance = 16000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:164: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:164: Setting default value for video max rate = 6229744. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:219: Setting default value for audio sample rate = 22050. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:219: Setting default value for audio channel count = 1. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:219: Setting default value for video bit rate tolerance = 64000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:219: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:219: Setting default value for video max rate = 6369328. Use NoDefaults to disable it.
  
  bind(port 8090): Address already in use
  
  Wed Nov 29 13:17:49 2017 Could not start server
  
  [video4linux2,v4l2 @ 0x1a35630] The driver changed the time per frame from 1/21 to 1/10
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, start: 12116.079136, bitrate: 147456 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 147456 kb/s, 10 fps, 10 tbr, 1000k tbn, 1000k tbc
  
  Guessed Channel Layout for Input Stream #1.0 : stereo
  
  Input #1, alsa, from 'sysdefault:CARD=HD3000':
  
    Duration: N/A, start: 1511961469.424072, bitrate: 1536 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  [tcp @ 0x1a44160] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
  
  Wed Nov 29 13:17:49 2017 127.0.0.1 - - [GET] "/feed1.ffm HTTP/1.1" 200 4175
  
  [tcp @ 0x1a63ca0] Connection to tcp://localhost:8090 failed (Connection refused), trying next address
  
  [mpeg1video @ 0x1a6ecb0] bitrate tolerance 21333 too small for bitrate 64000, overriding
  
  [mpeg1video @ 0x1a6ecb0] MPEG-1/2 does not support 3/1 fps
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (pcm_s16le (native) -> mp2 (native))
  
    Stream #0:0 -> #0:1 (rawvideo (native) -> mpeg1video (native))
  
    Stream #1:0 -> #0:2 (pcm_s16le (native) -> wmav2 (native))
  
    Stream #0:0 -> #0:3 (rawvideo (native) -> msmpeg4v3 (msmpeg4))
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Wed Nov 29 13:17:49 2017 127.0.0.1 - - [POST] "/feed1.ffm HTTP/1.1" 200 0
  
  [2]+  Exit 1                  ffserver -f /etc/ffserver.conf

  I use the default /etc/ffserver.conf.
  I can’t seem to figur out what is the problem.

• gstreamer h264 multicast missing SPS/PPS information

  6 mars 2015, par RBI

  I have two video streaming units capable of streaming live video inputs :

  • AXIS Q7424-R Video Encoder
  • EPIPHAN VGADVI Broadcaster 99460 -

  I am using gstreamer to view these streams on client terminals running linux. I am interested in the h264, rtp multicast streams (which both units support).

  I can stream the Epiphan video using the following gstreamer pipeline :

  gst-launch-0.10 udpsrc multicast-group=ADDRESS port=PORT caps='application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264' ! rtph264depay ! ffdec_h254 ! autovideosink

  However, this pipeline does not work for the Axis unit as I get the following error repeatedly :

  ffmpeg:0:: non-existing PPS referenced
  
  ffmpeg:0:: non-existing PPS 0 referenced
  
  ffmpeg:0:: decode_slice_header error
  
  ffmpeg:0:: no frame!
  
  ffdec_h264: decoding error (len:-1, have_data: 0)

  I have read that this error means that the ffmpeg decoder is missing the SPS/PPS information provided by a keyframe. The axis unit has a GOV parameter which is the interval at which i-frames are sent ; it is set to 32.

  Note that I can view both units’ rtp streams in unicast with the following :

  gst-launch-0.10 rtspsrc location=rtsp://ADDRESS:PORT/... latency=100 ! rtph264depay ! ffdec_h264 ! autovideosink

  Since unicast works and the unicast and multicast pipelines are the same (except for the source), my guess is either :

  • My udpsrc caps are simply incorrect for the axis stream (and I don’t really know where/how to verify it)

  • or, the axis multicast format/encoding is different and requires a modification to the pipeline (I find this unlikely since unicast is working and I don’t understand why the encoding would change between unicast/multicast).

  Any suggestions are appreciated as I am limited by my knowledge of gstreamer and media formats in terms of what to try next.

• How to create batch file for FFMpeg to download stream videos

  7 juin 2017, par bashir saboori

  Hi I’m using this cmd code to download stream video using ffmpeg :

  ffmpeg -i "http://wpc.866f.edgecastcdn.net/03866F/greyback/yourtrinity/130929-webword_,2500,1500,580,265,.mp4.m3u8" -c copy 130929-webword.mkv

  now I want a batch file that in running time ask me the video address and the file name by pressing Enter.