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• Python program which reads and extracts specific information from JSON file generated by FFPROBE

  3 février 2017, par Georgе Stoyanov

  I want to create a simple Python script, which runs a custom ffprobe script and then extracts some specific information from the generated JSON file. So the ffprobe command is :

  ffprobe -v quiet -print_format json -show_format -show_streams example.mp4 > output.json

  This command is extracting the video specific information into output.json file. Then I want to read the file and extract some specific information out of it. For example the JSON file has the following format :

  {
  
      "streams": [
  
          {
  
              "index": 0,
  
              "codec_name": "h264",
  
              "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
  
              "profile": "High 4:2:2 Intra",
  
              "codec_type": "video",
  
              "codec_time_base": "1/100",
  
              "codec_tag_string": "[0][0][0][0]",
  
              "codec_tag": "0x0000",
  
              "width": 3840,
  
              "height": 2160,
  
              "coded_width": 3840,
  
              "coded_height": 2160,
  
              "has_b_frames": 0,
  
              "sample_aspect_ratio": "1:1",
  
              "display_aspect_ratio": "16:9",
  
              "pix_fmt": "yuv422p10le",
  
              "level": 52,
  
              "color_range": "tv",
  
              "color_space": "bt709",
  
              "color_transfer": "bt709",
  
              "color_primaries": "bt709",
  
              "chroma_location": "left",
  
              "field_order": "progressive",
  
              "refs": 1,
  
              "is_avc": "false",
  
              "nal_length_size": "0",
  
              "r_frame_rate": "50/1",
  
              "avg_frame_rate": "50/1",
  
              "time_base": "1/50",
  
              "start_pts": 0,
  
              "start_time": "0.000000",
  
              "duration_ts": 15000,
  
              "duration": "300.000000",
  
              "bits_per_raw_sample": "10",
  
              "disposition": {
  
                  "default": 0,
  
                  "dub": 0,
  
                  "original": 0,
  
                  "comment": 0,
  
                  "lyrics": 0,
  
                  "karaoke": 0,
  
                  "forced": 0,
  
                  "hearing_impaired": 0,
  
                  "visual_impaired": 0,
  
                  "clean_effects": 0,
  
                  "attached_pic": 0,
  
                  "timed_thumbnails": 0
  
              },
  
              "tags": {
  
                  "file_package_umid": "0x060A2B340101010501010D0013EC94F152947134B6EC94F10052947134B6EC01",
  
                  "file_package_name": "Source Package"
  
              }
  
          }
  
      ],
  
      "format": {
  
          "filename": "300sec.mxf",
  
          "nb_streams": 1,
  
          "nb_programs": 0,
  
          "format_name": "mxf",
  
          "format_long_name": "MXF (Material eXchange Format)",
  
          "start_time": "0.000000",
  
          "duration": "300.000000",
  
          "size": "16772788991",
  
          "bit_rate": "447274373",
  
          "probe_score": 100,
  
          "tags": {
  
              "uid": "adab4424-2f25-4dc7-92ff-29bd000c0000",
  
              "generation_uid": "adab4424-2f25-4dc7-92ff-29bd000c0001",
  
              "company_name": "FFmpeg",
  
              "product_name": "OP1a Muxer",
  
              "product_version": "57.66.101",
  
              "product_uid": "adab4424-2f25-4dc7-92ff-29bd000c0002",
  
              "modification_date": "0-01-02T00:00:00.000000Z",
  
              "material_package_umid": "0x060A2B340101010501010D0013EC94F152947134B6EC94F10052947134B6EC00",
  
              "timecode": "00:00:00:00"
  
          }
  
      }
  
  }

  Perfect will be if the Python script runs and then asks you for the path to the input file.

  Unfortunately I have very little experience with Python, but it comes pre-installed on my system and I want to use it. The other option is to write a bash script doing the same. Any suggestions will be greatly appreciated.

  So far I have figured out how I can open the JSON file and to extract data from it using :

  import json
  
  
  
  with open('output.json') as json_data:
  
      data = json.load(json_data)
  
      json_data.close()
  
      print(data["streams"][0]["codec_name"])
  
      print(data["streams"][0]["profile"])

• The C compiler "clang.exe" is not able to compile a simple test program

  8 octobre 2020, par M. Bilal Asif

  I am trying to compile shell script that compiles the C project library, but i am stuck at this when it comes to compile the nmake part.

  


  I am using NDK 21 and cmake version is 3.10

  


  I am using shell script using bash same as defined here, i want to compress this library as they showing in the docs running ./android.sh

  


  Please check the link : https://github.com/tanersener/mobile-ffmpeg#52-build-scripts

  


  here is the attached log :

  


  DEBUG: Downloading library source: cpu-features

DEBUG: Checking if cpu-features is already downloaded at /d/Bilals/Projects/GithubProjects/mobile-ffmpeg/src/cpu-features

INFO: cpu-features library already downloaded

INFO: cpu-features already downloaded. Source folder found at /d/Bilals/Projects/GithubProjects/mobile-ffmpeg/src/cpu-features

-- Building for: NMake Makefiles
-- Check for working C compiler: D:/Bilals/PcBackupData/sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe
CMake Error: Generator: execution of make failed. Make command was: "nmake" "/NOLOGO" "cmTC_adf3f\fast"
-- Check for working C compiler: D:/Bilals/PcBackupData/sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe -- broken
CMake Error at D:/Bilals/PcBackupData/sdk/cmake/3.10.2.4988404/share/cmake-3.10/Modules/CMakeTestCCompiler.cmake:52 (message):
  The C compiler

    "D:/Bilals/PcBackupData/sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: D:/Bilals/Projects/GithubProjects/mobile-ffmpeg/android/build/cpu-features/arm/CMakeFiles/CMakeTmp
    
    Run Build Command:"nmake" "/NOLOGO" "cmTC_adf3f\fast"
    The system cannot find the file specified
    Generator: execution of make failed. Make command was: "nmake" "/NOLOGO" "cmTC_adf3f\fast"
    

  

  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:9 (project)


-- Configuring incomplete, errors occurred!
See also "D:/Bilals/Projects/GithubProjects/mobile-ffmpeg/android/build/cpu-features/arm/CMakeFiles/CMakeOutput.log".
See also "D:/Bilals/Projects/GithubProjects/mobile-ffmpeg/android/build/cpu-features/arm/CMakeFiles/CMakeError.log".


  


  and here is my environmental variables

  


  

  


• build : Conditionally build and run DCT test program

  21 juillet 2014, par Diego Biurrun

  build : Conditionally build and run DCT test program
  

  • [DBH] libavcodec/Makefile
  • [DBH] libavcodec/dct-test.c
  • [DBH] tests/fate/libavcodec.mak