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• Can you split a file using ffmpeg directly from a db ?

  31 mars 2014, par Jeff

  I am splitting a file using ffmpeg and python. I am able split a file if I input a file path, but if I send in the file itself from my mongodb, it errors out. Is there a way to get ffmpeg to run using the file instead of the path to the file ?

  python code :

  args = [ffmpeg_binary,
  
                           "-v", "quiet",
  
                           "-y", "-i", video_file, "-vcodec", "copy", "-acodec", "copy",
  
                   "-ss", "00:00:00", "-t", "00:00:10", "-sn",
  
                   output_file_name ]
  
  
  
  pipe = sp.Popen(args)

  if video_file is a gridfs.grid_file.GridOut object or a (gridfs.grid_file.GridOut object).read(), I get :

  Traceback (most recent call last):
  
    File "C:/dev/youniversity/test.py", line 21, in <module>
  
      split_vid_from_file(vid_file)
  
    File "C:\dev\youniversity\src\lib\ffmpeg_lib.py", line 107, in split_vid_from_file
  
      pipe = sp.Popen(args)
  
    File "C:\Python27\lib\subprocess.py", line 709, in __init__
  
      errread, errwrite)
  
    File "C:\Python27\lib\subprocess.py", line 957, in _execute_child
  
      startupinfo)
  
  TypeError: must be string without null bytes or None, not str
  
  </module>

  How do I split the video directly from the DB ?

  EDIT : I found that you can do this :

  ... "-y", "-", ... 
  
  
  
  pipe = sp.Popen(args, stdin=sp.PIPE)

  but I don't want the user to type input, I want to pipe in the variable.

• complex ffmpeg command line to Node fluent ffmpeg

  13 février 2017, par Faellor

  I have read the other question on command line input to Node Fluent ffmpeg but the command I am trying to execute is more complex and any ideas are appreciated.

  ffmpeg -i cut2.mp4 -c copy -an nosound2.mp4 && ffmpeg -i nosound2.mp4 -vf reverse reversednosound2.mp4 && ffmpeg -f concat -i inputs.txt -vcodec copy -acodec copy 2sec.mp4

  It is far from optimal because I am saving every video created with middle steps. I need to pipe the output of one command to the other command but I have no idea on how to do that with Node fluent-ffmpeg module.

  Any attempts to write this command with Node fluent-ffmpeg is greatly appreciated

• 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.