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• How to deal ffplay bein too slow playing iPhone's videos ?

  21 janvier 2019, par Mikhail T.

  Trying to play a 3840x2160 video recorded by an iPhone 7 (@30fps), I get frequent pauses — in the video, music keeps playing.

  This happens both in firefox and when ffplay is invoked to play the file directly — from command-line. The CPU is a dual E6700 @3.20GHz — not super fast, but it should be able to play smoothly, shouldn’t it ? Video is Intel’s "series 4" integrated chipset — again, not a speed-daemon, but it should be adequate... Support for Intel’s VA API is included.

  I build ffmpeg-4.1 from source using FreeBSD port. As you can see, the port has a maddening amount of options — including several different ones for the 264-codec.

  Any suggestions for improving the decoding speed to the point, where it is watchable by a human ? Thank you !

• Stream audio from STDIN through VLC for SDR

  13 décembre 2018, par doghousedean

  I’m trying to get an audio stream from a Raspberry pi 2 to my windows desktop.

  The RTL SDR on my pi is great when using spyserver but there are some certain applications that cannot connect to it, echoes the meteor detector for example

  Streaming the audio from the pi to my desktop could work with the stereo mixer input device

  My idea is to use VLC but cannot figure it out

  $ rtl_fm -f 143.050 -M wbfm -s 180k -E deemp | cvlc - -v --sout '#standard{access=http,mux=ogg,dst=localhost:8080}'
  
  VLC media player 3.0.3 Vetinari (revision 3.0.3-1-0-gc2bb759264)
  
  Found 1 device(s):
  
    0:  Realtek, RTL2838UHIDIR, SN: 00000001
  
  
  
  Using device 0: Generic RTL2832U OEM
  
  [01d919d8] dbus interface error: Failed to connect to the D-Bus session daemon: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
  
  [01d919d8] main interface error: no suitable interface module
  
  [01d14938] main libvlc error: interface "dbus,none" initialization failed
  
  [01d92be8] main interface error: no suitable interface module
  
  [01d14938] main libvlc error: interface "globalhotkeys,none" initialization failed
  
  [01d92c50] dummy interface: using the dummy interface module...
  
  [73a01670] http access out warning: "localhost" HTTP host might be ignored in multiple-host configurations, use at your own risks.
  
  [73a01670] http access out: Consider passing --http-host=IP on the command line instead.
  
  [73a02dd0] mux_ogg mux: Open
  
  Found Rafael Micro R820T tuner
  
  Tuner gain set to automatic.
  
  [R82XX] PLL not locked!
  
  Tuned to 286143 Hz.
  
  Oversampling input by: 6x.
  
  Oversampling output by: 1x.
  
  Buffer size: 7.59ms
  
  Exact sample rate is: 1080000.025749 Hz
  
  [R82XX] PLL not locked!
  
  Sampling at 1080000 S/s.
  
  Output at 180000 Hz.
  
  [73a070b8] ps demux warning: this does not look like an MPEG PS stream, continuing anyway
  
  [73a070b8] ps demux warning: garbage at input from 509, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 89140, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 195382, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 279916, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 326867, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 434452, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 438851, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 454391, trying to resync...
  
  [73a070b8] ps demux warning: found sync code
  
  [73a070b8] ps demux warning: garbage at input from 547348, trying to resync...

  I figured I could send the rtl_fm output to ffmpeg and then to vlc but I just can’t figure out the options I need.

  $ rtl_fm -f 143.050 -M wbfm -s 180k -E deemp | ffmpeg -acodec pcm_u8 -f oga - | vlc - -I dummy --sout '#standard{access=http,mux=ogg,dst=localhost:8080}'

  This gives similar output to above with the differences below

  Output #0, oga, to 'pipe:':
  
  Output file #0 does not contain any stream
  
  Signal caught, exiting!
  
  
  
  User cancel, exiting...
  
  [739070b8] mjpeg demux error: cannot peek
  
  [73c00520] main input error: Your input can't be opened
  
  [73c00520] main input error: VLC is unable to open the MRL 'fd://0'. Check the log for details.
  
  [73902dd0] mux_ogg mux: Close

• How to deal ffplay bein too slow playing iPhone's videos ?

  21 janvier 2019, par Mikhail T.

  Trying to play a 3840x2160 video recorded by an iPhone 7 (@30fps), I get frequent pauses — in the video, music keeps playing.

  This happens both in firefox and when ffplay is invoked to play the file directly — from command-line. The CPU is a dual E6700 @3.20GHz — not super fast, but it should be able to play smoothly, shouldn’t it ? Video is Intel’s "series 4" integrated chipset — again, not a speed-daemon, but it should be adequate... Support for Intel’s VA API is included.

  I build ffmpeg-4.1 from source using FreeBSD port. As you can see, the port has a maddening amount of options — including several different ones for the 264-codec.

  Any suggestions for improving the decoding speed to the point, where it is watchable by a human ? Thank you !