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• Converting dolby vision + lossless audio mkv to higher compatibility mp4 using ffmpeg

  28 septembre 2023, par Infinity

  I want to convert mkv to mp4 for the following reasons.

  


  Mkv files do not trigger dolby vision on an LG OLED A1 but mp4 files do.

  


  Lossless TrueHD with Atmos audio and DTS-HD MA audio are not supported by LG A1 OLED.

  


  I would like guidance on what commands need to be used to to perform a conversion that keeps all original audio and subtitle tracks of different languages and file formats.

  


  I have had some success with a reddit post converting mkv files that have dolby vision and eac3 with atmos tracks to mp4 maintaining dolby vision and atmos data but I lose all subtitle tracks and only one audio track is converted other languages and tracks lost.

  


  I have not been able to find information online regarding going from DTS-HD MA or TrueHD with atmos to eac3 with atmos or any other supported format by LG A1 OLED.

  


• How to keep the last 1 min video streaming using ffmpeg ?

  4 août 2020, par Lawrence song

  I have a UVC camera /dev/video1. The Camera will be always on. but I only care about the last 1 min data stream.

  


  after searching online I got a ffmpeg cmd :

  


  ./ffmpeg -f v4l2 -input_format mjpeg -video_size 320x240 -i /dev/video1 -c copy -f segment -segment_time 60 -segment_wrap 2 output.mkv


  


  However I got a error and here is the result

  


    libavutil      56. 56.100 / 56. 56.100
  libavcodec     58. 97.100 / 58. 97.100
  libavformat    58. 49.100 / 58. 49.100
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, matroska,webm, from '/sdcard/Movies/output.mkv':
  Metadata:
    ENCODER         : Lavf58.49.100
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 320x240, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
[matroska @ 0x3899e10] Invalid segment filename template 'output.mkv'
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument


  


• Debayer video with ffmpeg

  23 février 2023, par Andrew Spence

  Looking to debayer video with ffmpeg. I can't find a way to do it without piping raw video between two instances of ffmpeg, because I can't change the pixel format of my input video "in place" from gray to bayer_gbrg8. So, this command works :

  


  ffmpeg -i fr_losslessmovie_png_codec.avi -f image2pipe -pix_fmt gray \
-vcodec rawvideo - | ffmpeg -r 25 -f rawvideo -s 2048x700 \
-pix_fmt bayer_gbrg8 -i pipe:0 -y -pix_fmt yuv420p -b:v 25000k \
fr_debayer_compressed.mp4


  


  I would have given the source movie this pixel format, but didn't realize ffmpeg suported bayered pixel formatting.

  


  Didn't see this exact question online, and have not found a way to change the pixel format with video filters etc. without ffmpeg thinking i'm trying to convert the data. I just want to change the pixel format that the already existing gray data has been assigned.

  


  Thanks in advance !