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• How to save frame numbers with ffmpeg ?

  28 décembre 2018, par JulianJ

  I am using ffmpeg to scan video files for scene changes and save the results to a text file. The code I am using below works but I want to simplify the results and just output the frames number where the scene changes occur and the not all the data that this code produces. Any suggestions ?

  ffprobe -show_frames -of compact=p=0 -f lavfi "movie=input.mov,select=gt(scene\,.02)" > results.txt

  Outputs all this :

  media_type=video    stream_index=0  key_frame=1 pkt_pts=31031   pkt_pts_time=1.292958   pkt_dts=31031   pkt_dts_time=1.292958   best_effort_timestamp=31031 best_effort_timestamp_time=1.292958 pkt_duration=N/A    pkt_duration_time=N/A   pkt_pos=82320   pkt_size=629760 width=640   height=328  pix_fmt=rgb24   sample_aspect_ratio=1:1 pict_type=I coded_picture_number=0  display_picture_number=0    interlaced_frame=0  top_field_first=0   repeat_pict=0   tag:lavfi.scene_score=0.025551  

• How can I save an animation from matplotlib as a mp4 video file ? [duplicate]

  19 décembre 2018, par Manza

  This question already has an answer here :

  • How can I overcome this key word error ?
    
    4 answers
    

  I’m trying to render a animation.ArtistAnimation object into a 24 fps video file in format mp4.

  I have search about and I reached this. However, even after compiling ffmpeg I get this error message :

  C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\Scripts\python.exe 
  
  "C:/Users/trite/OneDrive/Documentos/MusiTex/Python/venv/Saving Animation.py"
  
  Traceback (most recent call last):
  
    File "C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\lib\site- 
  
  packages\matplotlib\animation.py", line 161, in __getitem__
  
      return self.avail[name]
  
  KeyError: 'ffmpeg'
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "C:/Users/trite/OneDrive/Documentos/MusiTex/Python/venv/Saving 
  
  Animation.py", line 20, in <module>
  
      FFMpegWriter = manimation.writers['ffmpeg']
  
    File "C:\Users\trite\OneDrive\Documentos\MusiTex\Python\venv\lib\site- 
  
  packages\matplotlib\animation.py", line 164, in __getitem__
  
      'Requested MovieWriter ({}) not available'.format(name))
  
  RuntimeError: Requested MovieWriter (ffmpeg) not available
  
  
  
  Process finished with exit code 1
  
  </module>

  What is the problem with ?

  I would really appreciate if you can help me. Actually, if there is other ways to saving/render this kind of object into a video file (preferably mp4) I will be delighted to hear them.

  Thank you very much

• Apply filters to video while preview and save it with applied filter and original audio in android

  27 novembre 2019, par FreakInDroid

  I am new to video processing. I want to apply a filter to a video at runtime, and I want to save that video after filter applied.

  Regarding this I’m doing a research. I has gone through many libraries but I’m struggling to achieve my aim.

  Developement environment

  Migw-64 with windows 7 64 bit
  
  Android Studio 2.1 preview 5
  
  heap space 4GB 
  
  com.android.tools.build:gradle:2.1.0
  
  android-ndk-r12-win-x86_64
  
  com.android.tools.build:gradle-experimental:0.7.0  --> to build NDK

  I have tried

  1. AndroidFastImageprocessingLibrary

     Chrisbatt -> AndroidFastImageProcessing in github

     This library use GLSurfaceview to display filters but we could not save it to mp4 file.

     So I found another implementation of it icmobilelab -> AndroidFastImageProcessing in github

     This library use JavaCV with ffmpeg compiled. But it failed.

  2. JavaCV

     JavaCV use outdated ffmpeg and it is abandoned.

  3. Grafika -> on github

     I tried Android Fast Image Processing with RecordFBOActivity in grafika. But i have failed. This library use MediaRecorder to record the contents of GLSurfaceView. But it records video without audio (I have tested the RecordFBOActivity and analyze the code).

  4. filter packs in platform_frameworks

     github.com/android/platform_frameworks_base/blob/master/media/mca/filterpacks/java/android/filterpacks/videosink/MediaEncoderFilter.java
     its android 4.2 edited core. I can’t run this code because too many jni dependencies.

  5. ffmpeg

     github.com/guardianproject/android-ffmpeg
     I tried ffmpeg3.1 compilation procedure implemented by guardianproject. it successfullay built a static library but i cannot build dynamic library (so files). I’m stuck with a linker error. I think the linking order matters. I tried the linking order specified in below link
     https://fritzone.wordpress.com/2010/05/11/link-with-static-ffmpeg/
     but it won’t help. the following error occurs

     [armeabi-v7a] SharedLibrary  : libffmpeg.so
     
     jni/ffmpeg.c:200: error: undefined reference to 'av_frame_alloc'
     
     jni/ffmpeg.c:201: error: undefined reference to 'av_frame_alloc'
     
     jni/ffmpeg.c:209: error: undefined reference to 'av_register_all'
     
     jni/ffmpeg.c:210: error: undefined reference to 'avfilter_register_all'
     
     jni/ffmpeg.c:45: error: undefined reference to 'avformat_open_input'
     
     jni/ffmpeg.c:50: error: undefined reference to 'avformat_find_stream_info'
     
     jni/ffmpeg.c:56: error: undefined reference to 'av_find_best_stream'
     
     jni/ffmpeg.c:63: error: undefined reference to 'av_opt_set_int'
     
     jni/ffmpeg.c:66: error: undefined reference to 'avcodec_open2'
     
     jni/ffmpeg.c:67: error: undefined reference to 'av_log'
     
     jni/ffmpeg.c:78: error: undefined reference to 'avfilter_get_by_name'
     
     jni/ffmpeg.c:79: error: undefined reference to 'avfilter_get_by_name'
     
     jni/ffmpeg.c:80: error: undefined reference to 'avfilter_inout_alloc'
     
     jni/ffmpeg.c:81: error: undefined reference to 'avfilter_inout_alloc'
     
     jni/ffmpeg.c:85: error: undefined reference to 'avfilter_graph_alloc'
     
     jni/ffmpeg.c:98: error: undefined reference to 'avfilter_graph_create_filter'
     
     jni/ffmpeg.c:106: error: undefined reference to 'avfilter_graph_create_filter'
     
     jni/ffmpeg.c:113: error: undefined reference to 'av_int_list_length_for_size'
     
     jni/ffmpeg.c:113: error: undefined reference to 'av_opt_set_bin'
     
     jni/ffmpeg.c:116: error: undefined reference to 'av_log'
     
     jni/ffmpeg.c:131: error: undefined reference to 'av_strdup'
     
     jni/ffmpeg.c:142: error: undefined reference to 'av_strdup'
     
     jni/ffmpeg.c:147: error: undefined reference to 'avfilter_graph_parse_ptr'
     
     jni/ffmpeg.c:151: error: undefined reference to 'avfilter_graph_config'
     
     jni/ffmpeg.c:155: error: undefined reference to 'avfilter_inout_free'
     
     jni/ffmpeg.c:156: error: undefined reference to 'avfilter_inout_free'
     
     jni/ffmpeg.c:218: error: undefined reference to 'av_read_frame'
     
     jni/ffmpeg.c:223: error: undefined reference to 'avcodec_decode_video2'
     
     jni/ffmpeg.c:230: error: undefined reference to 'av_frame_get_best_effort_timestamp'
     
     jni/ffmpeg.c:233: error: undefined reference to 'av_buffersrc_add_frame_flags'
     
     jni/ffmpeg.c:234: error: undefined reference to 'av_log'
     
     jni/ffmpeg.c:240: error: undefined reference to 'av_buffersink_get_frame'
     
     jni/ffmpeg.c:171: error: undefined reference to 'av_rescale_q'
     
     jni/ffmpeg.c:246: error: undefined reference to 'av_frame_unref'
     
     jni/ffmpeg.c:248: error: undefined reference to 'av_frame_unref'
     
     jni/ffmpeg.c:251: error: undefined reference to 'av_packet_unref'
     
     jni/ffmpeg.c:254: error: undefined reference to 'avfilter_graph_free'
     
     jni/ffmpeg.c:255: error: undefined reference to 'avcodec_close'
     
     jni/ffmpeg.c:256: error: undefined reference to 'avformat_close_input'
     
     jni/ffmpeg.c:257: error: undefined reference to 'av_frame_free'
     
     jni/ffmpeg.c:258: error: undefined reference to 'av_frame_free'
     
     jni/include/libavutil/error.h:111: error: undefined reference to 'av_strerror'
     
     collect2.exe: error: ld returned 1 exit status
     
     make: *** [obj/local/armeabi/libffmpeg.so] Error 1

  6. MediaCodec, MediaExtractor,MediaRecord,MediaMuxer

     Finally I planned to combine AndroidFastImageProcessing with MediaCodec, MediaExtractor,MediaRecord,MediaMuxer.

     So I try to Extract audio from video using mediamuxer
     https://gist.github.com/sayan801/9a39ccad0818d2b3499a.
     I use mp4 video (MIME Type video/avc that have 2 tracks audio and video) to extract audio but the resultant file is corrupted (just 4 kb)

  I think this question is another view of the existing problem if anybody experienced this problem please guide me.