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• VLC syntax to transcode and stream to stdout ?

  19 novembre 2016, par Will Tower

  Goal : I am trying to use VLC as a local server to expand the video capabilities of an app created with Adobe AIR, Flex and Actionscript. I am using VLC to stream to stdoutand reading that output from within my app.

  VLC Streaming capabilities
  VLC Flash Video
  Stream VLC to Website with asf and Flash

  Status : I am able to launch VLC as a background process and control it through its remote control interface (more detail). I can load, transcode and stream a local video file. The example app below is a barebones testbed demonstrating this.

  Issue : I am getting data in to my app but it is not rendering as video. I don’t know if it is a problem with my VLC commands or with writing to/reading from stdout. This technique of reading from stdout in AIR works (with ffmpeg for example).

  One of the various transcoding commands I have tried :

  -I rc  // remote control interface  
  
  -vvv   // verbose debuging  
  
  --sout  // transcode, stream to stdout 
  
  "#transcode{vcodec=FLV1}:std{access=file,mux=ffmpeg{mux=flv},dst=-}"

  This results in data coming into to my app but for some reason it is not rendering as video when using appendBytes with the NetStream instance.

  If instead I write the data to an .flv file, a valid file is created – so the broken part seems to be writing it to stdout. One thing I have noticed : I am not getting metadata through the stdout`method. If I play the file created with the command below, I do see metadata.

  // writing to a file
  
  var output:File = File.desktopDirectory.resolvePath("stream.flv");
  
  var outputPath:String = output.nativePath;
  
  "#transcode{vcodec=FLV1}:std{access=file,mux=ffmpeg{mux=flv},dst=" + outputPath + "}");

  ---

  Hoping someone sees where I am going wrong here.

  ---

  Update 1 : Just to add some more detail (!) – I took a look at the .flv file that is generated to examine the metadata. It appears at the head of the file as shown below. I have the correct onMetaData handler set up and see a trace of this data if I play the file from disk. I do not see this trace when reading from stdout and NetStream is in Data Generation mode. Is it possible that it isn’t getting sent to stdout for some reason ? I’ve tried generating my own header and appending that before the stream starts – I may not have the header format correct.

  

  ---

  Update 2 : So in my AIR app I was able to crudely parse the incoming stdout stream coming from VLC. I wanted to see if the FLV header data was being sent – and it appears that it is. I don’t know if it is in the correct format, etc. but as I mention above, if I write to an .flv file instead of stdout, a valid .flv file is created.

  Completely at a loss now – have tried everything I could think of and followed up every web link I could find on the issues involved. Alas – so close and it would have been so cool to leverage VLC from within AIR.

• Setting a framerate of a video created from images with ffmpeg (slowing down)

  9 octobre 2016, par jeet

  I’m making a video using ffmpeg & multiple images with this command :

  ffmpeg -f image2 -i img%d.png v.mpg

  The video is made, but plays very fast. Can I slow it down a bit ? (double duration nearly)
  If possible set the speed while creation itself please.

  I also need to add an audio "a.wav" to the video being made, possibly in the same command. Is that possible ?

  Please give me the commands
  Thanks

  When I use this command, below is the error I get :

  ffmpeg -r 12 -i pic\s%d.png -i rmt.wav -shortest -r 25 v.mpg
  
  
  
  
  
  
  
  FFmpeg version SVN-r16573, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
  configuration: --extra-cflags=-fno-common --enable-memalign-hack --enable-pthreads --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libfaac --enable-libgsm --enable-libx264 --enable-libschroedinger --enable-avisynth --enable-swscale --enable-gpl
  
  libavutil     49.12. 0 / 49.12. 0
  
  libavcodec    52.10. 0 / 52.10. 0
  
  libavformat   52.23. 1 / 52.23. 1
  
  libavdevice   52. 1. 0 / 52. 1. 0
  
  libswscale     0. 6. 1 /  0. 6. 1
  
  built on Jan 13 2009 02:57:09, gcc: 4.2.4
  
  Input #0, image2, from 'pic\s%d.png':
  
  Duration: 00:03:53.00, start: 0.000000, bitrate: N/A
  
  Stream #0.0: Video: png, rgb24, 1366x768, 12.00 tb(r)
  
  Input #1, wav, from 'rmt.wav':
  
  Duration: 00:12:16.19, bitrate: 64 kb/s
  
  Stream #1.0: Audio: pcm_u8, 8000 Hz, mono, s16, 64 kb/s
  
  Stream #0.0: Video: mpeg1video, yuv420p, 1366x768, q=2-31, 200 kb/s, 25.00 tb(c)
  
  Stream #0.1: Audio: mp2, 8000 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
  Stream #0.0 -> #0.0
  
  Stream #1.0 -> #0.1
  
  [mp2 @ 0x1738390]Sampling rate 8000 is not allowed in mp2
  
  Error while opening codec for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

• How to install libx265 for ffmpeg on Mac OSX

  20 mars 2016, par Spencer

  I have tried multiple guides here (search for "Building libx265") and here with no success. Both times I made sure I uninstalled ffmpeg first, went through the guides, then ran

  brew install ffmpeg --with-fdk-aac --with-freetype --with-libass --with-libvpx --enable-libx265

  No matter what when I go to run a command like

  ffmpeg -i source.mkv -c:v libx265 test1.mkv

  I get the error :

  Unknown encoder 'libx265'

  Has anyone had success building libx265 for use with ffmpeg on OSX and can you please share how you did it ?

  P.S. I am running OSX 10.11.3