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• screen mess when change video on rtmp

  16 mars 2014, par dingyaguang117

  1. when I use "ffmpeg -i" to probe video info， the infos below will be shown (take 2 examples)

     Stream #0:0 : Video : h264 (High), yuv420p, 600x352, 281 kb/s, 29.97 tbr, 1k tbn, 59.94 tbc
     Stream #0:0(und) : Video : h264 (Main) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 532 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
     

     What does the "avc1" mean？why the first doesn't shown ?

     Will it be "screen mess","no sound" or "no image" when switch the video that is publishing to rtmp server if the contiguous video encode by different codec ?

  2. How to switch video publishing to rtmp smoothly ？
     I use nginx-rtmp-module，set "live on"，and use "ffmpeg -re" to publish video.
     My method to switch video is to "pkill ffmpeg", and start another "ffmpeg -re" process.
     If the contiguous videos encode by different codec，it maybe "screen mess","no sound" or "no image". What can I do to solve it ?

  3. Are there any experiences(about tools,switch videos,how to choose encoding) when doing live video ?

• Using VLC for MPEG2 video encoding with I-frames only

  4 mars 2014, par user3319428

  Is there a VLC option to be able to do MPEG2 video encoding with I-frames only (not P and B) ? I would like to be able to transcode from one file format (such as AVI) to another with MPEG2 transcoding done so that only I-frames are encoded. Later this file will be streamed to an MPEG2 decoder, and I would like to have this feature to simplify the decoder (due to hardware/software restrictions).

  It looks like the ffmpeg module in VLC may be able to do this, but I am not sure of the options for it. I tried to use the keyint=0 option (where the key frames are considered to be I-frames), but it did not seem to work, as the same output file size resulted with or without this option.

  What I really want is for the output file to be in transport stream format too.

  I am using VLC ver. 2.1.3 under Windows 7.

  Thanks in advance for any help you can offer.

• how to use ffmpeg -cookies to download aes encrypted hls stream

  3 mars 2014, par Shuman

  i need this cookies, so i can download stream from a m3u8 file,(it has this line

  #EXT-X-KEY:METHOD=AES-128,URI="https://xxx/myStream.php?wowzasessionid=861683502"

  so i can get the key right ? ( i have the login credential cookies to that site )

  according to this discussion, it was there, and i checked the code on github, it has the option.

  but when i compile it with the default options, there is no cookies option. how do i turn it on ?

  > ./ffmpeg -buildconf
  
  ffmpeg version N-61050-g2dcaa1b Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Mar  3 2014 14:31:05 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  
    configuration:
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 18.100 /  0. 18.100
  
  
  
    configuration:
  
  
  
  
  
  > ffmpeg -cookies
  
  /sww/gfx/lib64/python2.6/pytz/__init__.py:32: UserWarning: Module argparse was already imported from /sww/tools/lib64/python2.6/argparse.py, but /usr/lib/python2.6/site-packages is being added to sys.path
  
    from pkg_resources import resource_stream
  
  ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Mar 22 2013 09:58:42 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-44)
  
    configuration: --prefix=/dept/srd/vendor/ffmpeg/bundle.rhel5/ffmpeg1.2.0 --enable-static --enable-pthreads --enable-gpl --disable-ffserver --disable-ffplay --disable-ffprobe --extra-cflags=-I/dept/srd/vendor/ffmpeg/extern/rhel5/include --extra-ldflags=-L/dept/srd/vendor/ffmpeg/extern/rhel5/lib --enable-x11grab --enable-libx264 --enable-nonfree --enable-fontconfig --enable-libfreetype --enable-swscale --enable-libmp3lame --enable-libfaac
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Unrecognized option 'cookies'.
  
  Error splitting the argument list: Option not found