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• Losing Audio When Converting VOB to MPEG-2 using FFMPEG [closed]

  29 avril 2015, par Nathan

  I’m using FFMPEG to convert VOB files to MPEG2 using

  ffmpeg -i file.vob -c copy
out.mpg

  .

  It’s converting the video fine, but the audio doesn’t play on the resulting
  files. I get the

  [mpeg @ 0x118afc0] max_analyze_duration 5000000 reached at 5005000

  error, but setting -analyzeduration to 9999999 or higher doesn’t get
  rid of the error.

  I think it’s reading the stream correctly :

  Metadata :
    encoder : Lavf53.32.100
    Stream #0:0 : Video : mpeg2video, yuv420p, 720x480 [SAR 8:9 DAR 4:3], q=2-31,
                        6124 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
    Stream #0:1 : Audio : ac3, 48000 Hz, stereo, 256 kb/s`
  

  Here’s info on my install

  ffmpeg version 0.10.6 Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec 11 2012 23:58:43 with gcc 4.4.6 20110731 (Red Hat 4.4.6-3)
  configuration : —prefix=/usr —bindir=/usr/bin —datadir=/usr/share/ffmpeg
  
  — incdir=/usr/include/ffmpeg —libdir=/usr/lib64 —mandir=/usr/share/man
  
  — arch=x86_64 —extra-cflags=’-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
  
   fexceptions -fstack-protector —param=ssp-buffer-size=4 -m64 -mtune=generic’
  
  — enable-bzlib —disable-crystalhd —enable-gnutls —enable-libass
  
  — enable-libcdio —enable-libcelt —enable-libdc1394 —disable-indev=jack
  
  — enable-libfreetype —enable-libgsm —enable-libmp3lame —enable-openal
  
  — enable-libopenjpeg —enable-libpulse —enable-librtmp —enable-libschroedinger
  
  — enable-libspeex —enable-libtheora —enable-libvorbis —enable-libv4l2
  
  — enable-libx264 —enable-libxvid —enable-x11grab —enable-avfilter
  
  — enable-postproc —enable-pthreads —disable-static —enable-shared
  
  — enable-gpl —disable-debug —disable-stripping —shlibdir=/usr/lib64
  
  — enable-runtime-cpudetect
  libavutil      51. 35.100 / 51. 35.100
  libavcodec     53. 61.100 / 53. 61.100
  libavformat    53. 32.100 / 53. 32.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 61.100 /  2. 61.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
  

• how to call a c function in the C++ function with the same name ?

  25 juillet 2013, par wolfz

  how to call a c function in the C++ function with the same name ?
  calling 'extern "c"' to use c header and ": :"operation to use the c function,
  but the link error occur.

  my code :

  extern "C" {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  }
  
  ...
  
  class DllAvCodec 
  
  {
  
    public:
  
    ...
  
    virtual void av_free_packet(AVPacket *pkt) { ::av_free_packet(pkt); }
  
    ...
  
  }

  the error :

  D:/player/jni/lib/DllAvCodec.h:143: error: undefined reference to 'av_free_packet(AVPacket*)'

  why the code "::av_free_packet(pkt)" invoke undefined ?

  my Android.mk is :

  LOCAL_PATH := $(call my-dir)
  
  DEFINES += \
  
             -DTARGET_POSIX \
  
             -DTARGET_LINUX \
  
             -D_LINUX \
  
             -DTARGET_ANDROID \
  
             -D__STDC_CONSTANT_MACROS 
  
  
  
  ######################################
  
  #build ffmpeg prebuilt lib
  
  ######################################
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavcodec
  
  LOCAL_SRC_FILES := lib/lib/libavcodec.a 
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavfilter  
  
  LOCAL_SRC_FILES := lib/lib/libavfilter.a
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavformat  
  
  LOCAL_SRC_FILES := lib/lib/libavformat.a  
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavutil  
  
  LOCAL_SRC_FILES := lib/lib/libavutil.a  
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libpostproc  
  
  LOCAL_SRC_FILES := lib/lib/libpostproc.a   
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libswresample  
  
  LOCAL_SRC_FILES := lib/lib/libswresample.a   
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libswscale  
  
  LOCAL_SRC_FILES := lib/lib/libswscale.a
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  
  
  ######################################
  
  #build lib
  
  ######################################
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= player
  
  base := $(LOCAL_PATH)
  
  
  
  LOCAL_SRC_FILES += ......
  
  
  
  LOCAL_CPPFLAGS += -Wall -fexceptions $(DEFINES)  
  
  LOCAL_LDLIBS += -llog -lz
  
  LOCAL_LDFLAGS += -L../jni/lib/lib  -lavcodec -lavformat  -lavutil -lavfilter -lpostproc  -lswscale -lswresample
  
  
  
  LOCAL_STATIC_LIBRARIES := libavcodec \
  
                            libavformat \
  
                            libavutil \
  
                            libavfilter \
  
                            libpostproc \
  
                            libswscale \
  
                            libswresample 
  
  
  
  include $(BUILD_SHARED_LIBRARY)

• How can combine two separate scripts being piped together to make one script instead of two ?

  27 mars 2016, par user556068

  For the past couple hours I’ve been banging my head against the wall trying to figure out something I thought would be simple. Maybe it is but it’s beyond me at the moment. So I have now two scripts. Originallly they were part of the same but I could never make it work how it should. So the first part uses curl to download a file from a site. Then using grep and sedto filter out the text I need which is then put into a plain text file as a long list of website urls ; one per line. The last part of the 1st script calls on youtube -dl to read the batch file in order to obtain the web addresses where the actual content is located. I hope that makes sense.

  youtube-dl reads the batch file and outputs a new list urls into the terminal. This second list is not saved to file because it doesn’t need to be. These urls change from day to day or hour to hour. Using the read command, these urls are then passed to ffmpeg using a predetermined set of arguments for the input and output. Ffmpeg is executed on every url it receives and runs quietly in the background.

  The first paragraph describes script1.sh and paragraph 2 obviously describes script2.sh. When I pipe them together like script1.sh | script2.sh it works better than I ever thought possible. Maybe i’m nitpicking at this point but the idea is to have 1 unified script. For the moment I have simplified it by adding an alias to my .bash_profile.

  Here are the last two commands of script1.

  sed 's/\"\,/\//g' > "$HOME/file2.txt";
  
  cat $HOME/file2.txt | youtube-dl --ignore-config -iga -

  The trailing - allows youtube-dl to read from stdin.

  The second part of the script ; what I’m calling script2 at this point begins with

  while read -r input
  
  do
  
  ffmpeg [arg] [input] [arg2] [output]

  What am i not seeing that is causing the script to hang when the two halves are combined yet work perfectly if one is piped into the other ?