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• 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.

• 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 ?

• Android NDK : Aborting stop ?

  30 juillet 2014, par Sandeep Tiwari

  I am working on ffmpeg for android. I have successfully compile ffmpeg-2.0.1
  after that I make Android.mk file in my NDK’s sources/ffmpeg-2.0.1/android/arm as

        LOCAL_PATH:= $(call my-dir)
  
  
  
        include $(CLEAR_VARS)
  
  
  
        LOCAL_MODULE:= libavcodec
  
  
  
        LOCAL_SRC_FILES:= lib/libavcodec-55.so
  
  
  
         LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  
  
        include $(PREBUILT_SHARED_LIBRARY)

  After that make android project and in android project Android.mk file is as

    LOCAL_PATH := $(call my-dir)
  
  
  
      include $(CLEAR_VARS)
  
  
  
     LOCAL_MODULE    := tutorial01
  
     LOCAL_SRC_FILES := tutorial01.c
  
     LOCAL_LDLIBS := -llog -ljnigraphics -lz 
  
     LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil
  
  
  
     include $(BUILD_SHARED_LIBRARY)
  
      $(call import-module,ffmpeg-2.0.1/android/arm)

  but showing a problem

   *** Android NDK: Aborting    .  Stop.
  
     android-ffmpeg-tutorial01line 45, external location: 
  
     /home/tech/Documents/roman10/ndk/android-ndk-r9c/build/core/prebuilt-library.mk
  
     C/C++ Problem

  My NDK is android-ndk-r9c,system is ubuntu-13.04,please anyone guide me.

  thanks in advance.