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• Ffmpeg hangs while transcoding HDHomerun Prime on channel change

  23 octobre 2017, par devo1929

  I’m using ffmpeg to transcode a live stream from a HDHomerun Prime. Everything is working beautifully. However, one ability that I would like, if possible, is the ability to change the channel on the HDHomerun without having to stop and restart the ffmpeg transcoding process.

  I start the ffmpeg process to begin reading the UDP feed from the HDHomerun. It writes the stream to a series of *.ts files with a m3u8 playlist.

  The second I use hdhomerun_config to change the channel on the device, ffmpeg immediately reports the following and hangs :

  [mpegts @ 0000018b4e05be60] New video stream 0:3 at pos:295211888 and DTS:40884.7s=108 drop=0 speed=1.02x
[mpegts @ 0000018b4e05be60] New audio stream 0:5 at pos:295279568 and DTS:40884.4s
frame= 4488 fps= 29 q=23.0 q=27.0 q=23.0 size=N/A time=00:02:28.94 bitrate=N/A dup=108 drop=0 speed=0.959x

  The command I am using to launch ffmpeg is :

  ffmpeg.exe -t 03:00:00 -i "udp://192.168.1.150:5000?fifo_size=1000000&overrun_nonfatal=1" -vf yadif=0:-1:1 -y -threads 4 -c:v libx264 -s 1280x720 -r 30 -b:v 4500k -force_key_frames expr:gte(t,n_forced*2) -profile:v high -preset fast -x264opts level=41 -c:a libfdk_aac -b:a 96k -ac 2 -hls_time 10 -hls_list_size 6 -hls_wrap 6 -hls_base_url /stream/ -hls_flags temp_file -hls_playlist_type event "C:\temp\streams\4500-stream.m3u8"

  Is there a specific command that I can pass to allow ffmpeg to "recover" from this ? Or, is there an arg that prevents this hang in the first place ? I’m using the latest version v3.4 of ffmpeg cross-compiled for Windows from Ubuntu. The issue also occurred using the stable version v3.4 of ffmpeg for Windows from ffmpeg.org.

  Edit :

  A new discovery to the issue, but still not yet resolved :
  If I change to the channel BACK to the original channel, Ffmpeg is able to continue writing the stream.

  Example : I start on channel X. Ffmpeg is recording to a file. I change to channel Y. Ffmpeg outputs a message similar to the one posted above and "hangs." I change back to channel X and ffmpeg picks up where it left off, no problem.

• GStreamer x264 on Linux (ARM)

  8 septembre 2017, par Tõnu Samuel

  Trying to get streaming work with x264 encoding.

  I am doing some black magic with stitching two images which is known to work :

  gst-launch-1.0 -e \
  
      v4l2src device=/dev/video0 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_0 \
  
      v4l2src device=/dev/video1 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_1 \
  
      videomixer name=m sink_1::xpos=640 ! \
  
      video/x-raw,framerate=90/1,width=1280,height=480 ! \
  
      xvimagesink

  Now I am trying to get same thing over x264 stream with help of internet :

  gst-launch-1.0 -e \
  
      v4l2src device=/dev/video0 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_0 \
  
      v4l2src device=/dev/video1 ! \
  
          video/x-raw,framerate=90/1,width=640,height=480 ! m.sink_1 \
  
      videomixer name=m sink_1::xpos=640 ! \
  
      video/x-raw,framerate=90/1,width=1280,height=480 ! \
  
      x264enc tune=zerolatency byte-stream=true bitrate=3000 threads=2 ! \
  
      h264parse config-interval=1 ! \
  
      rtph264pay ! \
  
      udpsink host=127.0.0.1 port=5000 

  And seems to work because no errors appear. But I see no way to receive image.

  I have tried

  gst-launch-1.0 udpsrc port=5000 ! application/x-rtp ! rtph264depay ! h264parse ! avdec_h264 ! xvimagesink

  which does not provide anything useful. Also attempted to use VLC with SDP file :

  c=IN IP4 127.0.0.1
  
  m=video 5000 RTP/AVP 96
  
  a=rtpmap:96 H264/3000

  I must be doing something wrong but unsure what.

  EDIT : Question about version of GStreamer. Probably this is information needed :

  ubuntu@tegra-ubuntu:~$  gst-launch-1.0 --version
  
  gst-launch-1.0 version 1.2.4
  
  GStreamer 1.2.4
  
  https://launchpad.net/distros/ubuntu/+source/gstreamer1.0
  
  ubuntu@tegra-ubuntu:~$
  
  
  
  
  
  
  
  $ dpkg -l | grep gstreamer
  
  ii  gir1.2-gstreamer-1.0                                  1.2.4-0ubuntu1.1                                    armhf        Description: GObject introspection data for the GStreamer library
  
  ii  gstreamer-tools                                       0.10.36-1.2ubuntu3                                  armhf        Tools for use with GStreamer
  
  ii  gstreamer0.10-alsa:armhf                              0.10.36-1.1ubuntu2                                  armhf        GStreamer plugin for ALSA
  
  ii  gstreamer0.10-fluendo-mp3:armhf                       0.10.23.debian-3                                    armhf        Fluendo mp3 decoder GStreamer 0.10 plugin
  
  ii  gstreamer0.10-nice:armhf                              0.1.4-1                                             armhf        ICE library (GStreamer 0.10 plugin)
  
  ii  gstreamer0.10-plugins-bad:armhf                       0.10.23-7.2ubuntu1.3                                armhf        GStreamer plugins from the "bad" set
  
  ii  gstreamer0.10-plugins-bad-multiverse                  0.10.21-1ubuntu3                                    armhf        GStreamer plugins from the "bad" set (Multiverse Variant)
  
  ii  gstreamer0.10-plugins-base:armhf                      0.10.36-1.1ubuntu2                                  armhf        GStreamer plugins from the "base" set
  
  ii  gstreamer0.10-plugins-base-apps                       0.10.36-1.1ubuntu2                                  armhf        GStreamer helper programs from the "base" set
  
  ii  gstreamer0.10-plugins-good:armhf                      0.10.31-3+nmu1ubuntu5.2                             armhf        GStreamer plugins from the "good" set
  
  ii  gstreamer0.10-plugins-ugly:armhf                      0.10.19-2ubuntu5                                    armhf        GStreamer plugins from the "ugly" set
  
  ii  gstreamer0.10-pulseaudio:armhf                        0.10.31-3+nmu1ubuntu5.2                             armhf        GStreamer plugin for PulseAudio
  
  ii  gstreamer0.10-tools                                   0.10.36-1.2ubuntu3                                  armhf        Tools for use with GStreamer
  
  ii  gstreamer0.10-x:armhf                                 0.10.36-1.1ubuntu2                                  armhf        GStreamer plugins for X11 and Pango
  
  ii  gstreamer1.0-alsa:armhf                               1.2.4-1~ubuntu2                                     armhf        GStreamer plugin for ALSA
  
  ii  gstreamer1.0-clutter                                  2.0.8-1build1                                       armhf        Clutter PLugin for GStreamer 1.0
  
  ii  gstreamer1.0-fluendo-mp3:armhf                        0.10.23.debian-3                                    armhf        Fluendo mp3 decoder GStreamer 1.0 plugin
  
  ii  gstreamer1.0-libav:armhf                              1.2.4-1~ubuntu1                                     armhf        libav plugin for GStreamer
  
  ii  gstreamer1.0-nice:armhf                               0.1.4-1                                             armhf        ICE library (GStreamer plugin)
  
  ii  gstreamer1.0-plugins-bad:armhf                        1.2.4-1~ubuntu1.1                                   armhf        GStreamer plugins from the "bad" set
  
  ii  gstreamer1.0-plugins-bad-faad:armhf                   1.2.4-1~ubuntu1.1                                   armhf        GStreamer faad plugin from the "bad" set
  
  ii  gstreamer1.0-plugins-bad-videoparsers:armhf           1.2.4-1~ubuntu1.1                                   armhf        GStreamer videoparsers plugin from the "bad" set
  
  ii  gstreamer1.0-plugins-base:armhf                       1.2.4-1~ubuntu2                                     armhf        GStreamer plugins from the "base" set
  
  ii  gstreamer1.0-plugins-base-apps                        1.2.4-1~ubuntu2                                     armhf        GStreamer helper programs from the "base" set
  
  ii  gstreamer1.0-plugins-good:armhf                       1.2.4-1~ubuntu1.3                                   armhf        GStreamer plugins from the "good" set
  
  ii  gstreamer1.0-plugins-ugly:armhf                       1.2.3-2build1                                       armhf        GStreamer plugins from the "ugly" set
  
  ii  gstreamer1.0-pulseaudio:armhf                         1.2.4-1~ubuntu1.3                                   armhf        GStreamer plugin for PulseAudio
  
  ii  gstreamer1.0-tools                                    1.2.4-0ubuntu1.1                                    armhf        Tools for use with GStreamer
  
  ii  gstreamer1.0-x:armhf                                  1.2.4-1~ubuntu2                                     armhf        GStreamer plugins for X11 and Pango
  
  ii  libgstreamer-plugins-bad0.10-0:armhf                  0.10.23-7.2ubuntu1.3                                armhf        GStreamer shared libraries from the "bad" set
  
  ii  libgstreamer-plugins-bad1.0-0:armhf                   1.2.4-1~ubuntu1.1                                   armhf        GStreamer development files for libraries from the "bad" set
  
  ii  libgstreamer-plugins-base0.10-0:armhf                 0.10.36-1.1ubuntu2                                  armhf        GStreamer libraries from the "base" set
  
  ii  libgstreamer-plugins-base1.0-0:armhf                  1.2.4-1~ubuntu2                                     armhf        GStreamer libraries from the "base" set
  
  ii  libgstreamer-plugins-good1.0-0:armhf                  1.2.4-1~ubuntu1.3                                   armhf        GStreamer development files for libraries from the "good" set
  
  ii  libgstreamer0.10-0:armhf                              0.10.36-1.2ubuntu3                                  armhf        Core GStreamer libraries and elements
  
  ii  libgstreamer1.0-0:armhf                               1.2.4-0ubuntu1.1                                    armhf        Core GStreamer libraries and elements
  
  $ 

• FFplay : WASAPI can't initialize audio client (FFmpeg 3.4 binaries)

  9 juillet 2022, par fve

  I am trying to playback a stream that is multicasted over RTP using ffplay on Windows 7 64 bits.
The computer that serves the audio over RTP runs :

  



  ffmpeg -re -f dshow -audio_buffer_size 15 -ac 1 -i audio="Mic in at front Mic-in (Realtek" -ar 8k -acodec pcm_alaw -vn -f rtp rtp://127.0.0.1:5000


  



  The client runs :

  



  ffplay rtp://127.0.0.1:5000


  



  While this was working correctly in release 3.3, release 3.4 fails with this error :

  



  SDL_OpenAudio (1 channels, 8000 Hz): WASAPI can't initialize audio client: CoInitialize has not been called.

No more combinations to try, audio open failed
Failed to open file 'rtp://127.0.0.1:5000' or configure filtergraph


  



  Anyone has an idea of whats going on ?

  



  Thanks

  



  UPDATE #1 :

  



  A workaround is to specify an alternate output driver.
Set SDL_AUDIODRIVER environment variable value to the driver you want to use.
Under windows 7, directsound and winmm both solved my issue.