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• How to concat videos that have different colour spaces ?

  17 avril 2023, par Ham789

  I writing a Python program that uses subprocess to automate ffmpeg. The program concatenates many videos together with the concat filter. The problem I have is that the colour of some of the videos is very washed out in the final output. I believe this is because the videos have different colour spaces. Some are B.709 and some are B.2020. The B.2020 videos are washed out.

  


  I have tried converting the B.2020 videos to B.709 before concatenating by using the following command on each video but the outputs are still washed out :

  


  ffmpeg -i input.mov -vf colorspace=all=bt709:iall=bt2020:fast=1 output.mov


  


  It wasn't clear to me which way round the arguments should go so I also tried switching the bt2020 and bt709 terms but they still look washed out but with more saturation.

  


  Is this the right approach ? Am I missing some other arguments in order to convert the B.2020 videos to B.709 while preserving their colour ?

  


  I have attached a side by side of the original and converted video.

  


  The metadata of the videos I am trying to concat are :

  


  Video 1

  


  

  • color_range=tv

  


  • color_space=bt709

  


  • color_transfer=bt709

  


  • color_primaries=bt709

  


  


  Video 2

  


  

  • color_range=tv

  


  • color_space=bt2020nc

  


  • color_transfer=arib-std-b67

  


  • color_primaries=bt2020

  


  


• Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  28 août 2020, par bbdangar

  I am using this library : com.arthenica:mobile-ffmpeg-full:4.4

  


  Getting this error message while running the command :

  


  final String command = "-y -i "+ inputPath +" -ar 22050 -hls_list_size 1000000 -hls_time 2 -s 640x360 " + outputPath;


  


  here is the complete code :

  


  private void convertVideo() {
        String inputPath = "/storage/emulated/0/Download/video.mp4";
        String outputPath = "/storage/emulated/0/Download/output.m3u8";
        final String command = "-y -i "+ inputPath +" -ar 22050 -hls_list_size 1000000 -hls_time 2 -s 640x360 " + outputPath;
        FFmpeg.executeAsync(command, new ExecuteCallback() {
            @Override
            public void apply(long executionId, int returnCode) {

                if (returnCode == RETURN_CODE_SUCCESS) {
                    Log.i(TAG, "Command execution completed successfully.");
                } else if (returnCode == RETURN_CODE_CANCEL) {
                    Log.i(TAG, "Command execution cancelled by user.");
                } else {
                    Log.i(TAG, String.format("Command execution failed with rc=%d and the output below.", returnCode));
                    Config.printLastCommandOutput(Log.INFO);
                }
            }
        });

    }


  


  here is output log :

  


  2020-08-28 07:05:59.355 10725-10820 W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0xe2306c80] sws_param option is deprecated and ignored
2020-08-28 07:05:59.448 10725-10820 E/mobile-ffmpeg: [h264_v4l2m2m @ 0xcb442c00] can't configure encoder
2020-08-28 07:05:59.448 10725-10820 E/mobile-ffmpeg: Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
2020-08-28 07:05:59.463 10725-10820 I/mobile-ffmpeg: Conversion failed!
2020-08-28 07:05:59.465 10725-10725 I/mobile-ffmpeg: ffmpeg version v4.4-dev-416 Copyright (c) 2000-2020 the FFmpeg developers


  


• doc/muxers.texi : fix build issue for unknown command

  18 avril 2021, par Guo, Yejun

  doc/muxers.texi : fix build issue for unknown command
  The build log :
  
  ** Unknown command `@code' (left as is) (in src/doc/muxers.texi l. 2020)
  
  *** '' without macro. Before : -map option with the ffmpeg CLI tool. (in src/doc/muxers.texi l. 2020)
  
  *** '' without opening '' before :  option with the ffmpeg CLI tool. (in src/doc/muxers.texi l. 2020)
  
  

  • [DH] doc/muxers.texi