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• Encoding videos for use with Adobe Live Streaming

  10 mai 2016, par FiddleMeRagged

  I have an original video coded at 20Mbps, 1920x1080, 30fps and want to convert it down to be 640x480 30fps at a range of (3 different) bitrates for use by Adobe Live Streaming.

  Should I use ffmpeg to resize and encode at the 3 bitrates then use f4fpackager to create the f4m f4f and f4x files or just use ffmpeg to reduce the resolution and then f4fpackager to encode the relevant bitrates ?

  I’ve had several tries so far, but when encoded the videos seem to play at a much larger bitrate than they’ve been encoded at. For example, if I set up the OSMF to play from my webserver, I’d be expecting my best encoded video to play at 1,500kbps but it’s way above that.

  Has anyone had any experience of encoding for use like this ?

  I’m using the following options to f4fpackager

  --bitrate=1428 --segment-duration 30 --fragment-duration 2

• FFMPEG wmv conversion to flv

  25 novembre 2012, par Brandon Grossutti

  anyone using ffmpeg

  I have a fairly simple wmv exported by a user from movie maker with standard output and want to convert to .flv using

  C :>ffmpeg -i "E :\Jab Core 4 Recounters.wmv" -vcodec flv "C :\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\MediaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv" -ar 44100

  the output / error i receive is

  FFmpeg version 0.5, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilt
  
  er --enable-avfilter-lavf --enable-pthreads --enable-avisynth --enable-libfaac -
  
  -enable-libfaad --enable-libmp3lame --enable-libspeex --enable-libtheora --enabl
  
  e-libvorbis --enable-libxvid --enable-libx264 --enable-memalign-hack
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 0 / 52.20. 0
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 16 2009 16:09:18, gcc: 4.2.4 [Sherpya]
  
  [wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
  
  /1) -> 30.00 (30/1)
  
  Input #0, asf, from 'E:\Jab Core 4 Recounters.wmv':
  
    Duration: 00:01:55.99, start: 5.000000, bitrate: 813 kb/s
  
      Stream #0.0: Audio: wmav2, 48000 Hz, stereo, s16, 192 kb/s
  
      Stream #0.1: Video: wmv3, yuv420p, 640x480, 586 kb/s, 30 tbr, 1k tbn, 1k tbc
  
  
  
  Output #0, flv, to 'C:\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\Me
  
  diaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv':
  
      Stream #0.0: Video: flv, yuv420p, 640x480, q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
  
  
      Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  [wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
  
  [libmp3lame @ 0x1c0d8d0]flv does not support that sample rate, choose from (4410
  
  0, 22050, 11025).
  
  Could not write header for output file #0 (incorrect codec parameters ?)

  i added th -ar switch when i got the error the first time

  the codec info i have on the file is as follows

  General
  
  Complete name                    : E:\Jab Core 4 Recounters.wmv
  
  Format                           : Windows Media
  
  File size                        : 11.3 MiB
  
  Duration                         : 2mn 0s
  
  Overall bit rate mode            : Variable
  
  Overall bit rate                 : 780 Kbps
  
  Maximum Overall bit rate         : 949 Kbps
  
  Encoded date                     : UTC 2009-03-07 07:02:41.121
  
  Writing application              :  6.0.6000.16386 / Windows Movie Maker
  
  Application                      : Windows Movie Maker 6.0.6000.16386
  
  
  
  Video
  
  ID                               : 2
  
  Format                           : VC-1
  
  Format profile                   : MP@ML
  
  Codec ID                         : WMV3
  
  Codec ID/Info                    : Windows Media Video 9
  
  Codec ID/Hint                    : WMV3
  
  Duration                         : 2mn 0s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 587 Kbps
  
  Width                            : 640 pixels
  
  Height                           : 480 pixels
  
  Display aspect ratio             : 4/3
  
  Frame rate                       : 30.000 fps
  
  Resolution                       : 24 bits
  
  Scan type                        : Progressive
  
  Bits/(Pixel*Frame)               : 0.064
  
  Stream size                      : 8.46 MiB (75%)
  
  Language                         : en-us
  
  
  
  Audio
  
  ID                               : 1
  
  Format                           : WMA2
  
  Format profile                   : L3
  
  Codec ID                         : 161
  
  Codec ID/Info                    : Windows Media Audio 2
  
  Description of the codec         : Windows Media Audio 9.2 - VBR Quality 90, 48 kHz, stereo 1-pass VBR
  
  Duration                         : 2mn 0s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 186 Kbps
  
  Channel(s)                       : 2 channels
  
  Sampling rate                    : 48.0 KHz
  
  Resolution                       : 16 bits
  
  Stream size                      : 2.68 MiB (24%)
  
  Language                         : en-us

  i see alot of people with this issue with so solution or cause

  any ideas would be helpful
  thanks in advance

• Merge remote-tracking branch ’cehoyos/master’

  4 septembre 2013, par Michael Niedermayer

  Merge remote-tracking branch ’cehoyos/master’
  * cehoyos/master :
  
    Show subtitle resolution in avcodec_string().
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/utils.c