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

  28 September 2023, by 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.

  


• MP4 file starts from a non-key frame [closed]

  1 October 2023, by userDtrm

  I have used the following ffprobe command to analyse a .mp4 file.

  


  


  ffprobe -i <input /> -show_frames - select_streams v:0 -print_format flat &amp;> save_to_file.text

  


  


  It produces the following output.

  


  

    ffprobe version 5.1.3 Copyright (c) 2007-2022 the FFmpeg developers
      built with gcc 13 (GCC)
      configuration: —prefix=/home/thanuja/ffmpeg_build —pkg-config-flags=—static —extra-cflags=-I/home/thanuja/ffmpeg_build/include —extra-ldflags=-L/home/thanuja/ffmpeg_build/lib —extra-libs=-lpthread —extra-libs=-lm —bindir=/home/thanuja/bin —enable-gpl —enable-libfdk_aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libvpx —enable-libx264 —enable-libx265 —enable-nonfree —enable-openssl —enable-demuxer=spdif —enable-decoder=dolby_e —enable-decoder=ac3 —enable-decoder=eac3 —enable-indev=alsa —enable-outdev=alsa —enable-shared
      libavutil      57. 28.100 / 57. 28.100
      libavcodec     59. 37.100 / 59. 37.100
      libavformat    59. 27.100 / 59. 27.100
      libavdevice    59.  7.100 / 59.  7.100
      libavfilter     8. 44.100 /  8. 44.100
      libswscale      6.  7.100 /  6.  7.100
      libswresample   4.  7.100 /  4.  7.100
      libpostproc    56.  6.100 / 56.  6.100
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'FTV267StoS.mp4':
      Metadata:
        major_brand     : mp42
        minor_version   : 1
        compatible_brands: isommp41mp42
        creation_time   : 2023-04-02T23:52:12.000000Z
      Duration: 00:04:47.84, start: 0.000000, bitrate: 7374 kb/s
      Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/unknown/bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 7198 kb/s, 59.94 fps, 59.94 tbr, 90k tbn (default)
        Metadata:
          creation_time   : 2023-04-02T23:52:12.000000Z
          handler_name    : Core Media Video
          vendor_id       : [0][0][0][0]
      Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
        Metadata:
          creation_time   : 2023-04-02T23:52:12.000000Z
          handler_name    : Core Media Audio
          vendor_id       : [0][0][0][0]
    frames.frame.0.media_type="video"
    frames.frame.0.stream_index=0
    frames.frame.0.key_frame=0
    frames.frame.0.pts=34536
    frames.frame.0.pts_time="0.383733"
    frames.frame.0.pkt_dts=34536
    frames.frame.0.pkt_dts_time="0.383733"
    frames.frame.0.best_effort_timestamp=34536
    frames.frame.0.best_effort_timestamp_time="0.383733"
    frames.frame.0.pkt_duration=1501
    frames.frame.0.pkt_duration_time="0.016678"
    frames.frame.0.pkt_pos="1834827"
    frames.frame.0.pkt_size="14917"
    frames.frame.0.width=1920
    frames.frame.0.height=1080
    frames.frame.0.pix_fmt="yuv420p"
    frames.frame.0.sample_aspect_ratio="1:1"
    frames.frame.0.pict_type="P"
    frames.frame.0.coded_picture_number=120
    frames.frame.0.display_picture_number=0
    frames.frame.0.interlaced_frame=0
    frames.frame.0.top_field_first=0
    frames.frame.0.repeat_pict=0
    frames.frame.0.color_range="tv"
    frames.frame.0.color_space="bt709"
    frames.frame.0.color_primaries="unknown"
    frames.frame.0.color_transfer="bt709"
    frames.frame.0.chroma_location="left"
    frames.frame.0.tags.timecode="20:18:26:50"
    frames.frame.0.side_data_list.side_data.0.side_data_type="H.26[45] User Data Unregistered SEI message"
    frames.frame.0.side_data_list.side_data.1.side_data_type="H.26[45] User Data Unregistered SEI message"
    frames.frame.0.side_data_list.side_data.2.side_data_type="SMPTE 12-1 timecode"
    frames.frame.0.side_data_list.side_data.2.timecodes.timecode.0.value="20:18:26:50"
    frames.frame.1.media_type="video"
    frames.frame.1.stream_index=0
    frames.frame.1.key_frame=0
    frames.frame.1.pts=36036
    frames.frame.1.pts_time="0.400400"
    frames.frame.1.pkt_dts=36036
    frames.frame.1.pkt_dts_time="0.400400"
    frames.frame.1.best_effort_timestamp=36036
    frames.frame.1.best_effort_timestamp_time="0.400400"
    frames.frame.1.pkt_duration=1501
    frames.frame.1.pkt_duration_time="0.016678"
    frames.frame.1.pkt_pos="1857434"
    frames.frame.1.pkt_size="14472"
    frames.frame.1.width=1920
    frames.frame.1.height=1080
    frames.frame.1.pix_fmt="yuv420p"
    frames.frame.1.sample_aspect_ratio="1:1"
    frames.frame.1.pict_type="P"



  


  As seen in this output, the 1st frame appears to be a P frame. I'm curious as to how will the decoder decode this frame without a preceding I frame (key frame)? The P frame will not have enough information to reconstruct the image from its residual data without the key frame.

  


• ffmpeg - converting one audio track of a multi-track mp4

  30 December 2023, by Shaun.M

  I'm having a few mp4 with two audio tracks,
an english one in aac and a french one in dts.

  


  Now I want to convert only the french dts to eac3 with a single ffmpeg command.

  


  I use

  


  ffmpeg -hide_banner -i input.mp4 ^
             -map_metadata -1 ^
             -map 0:0 -c:v copy ^
             -map 0:1 -c:a copy ^
             -map 0:2 -c:a eac3 -b:a 1536k ^
             -metadata:s:a:0 language=eng ^
             -metadata:s:a:0 title="Stereo" ^
             -metadata:s:a:1 language=fra ^
             -metadata:s:a:1 title="Stereo" ^
output.mp4


  


  This works quite nice, but it converts both audio tracks to eac3, instead of leaving the first one untouched ...
What's wrong in the command?

  


  (ffmpeg version 2023-12-23-git-f5f414d9c4-full_build-www.gyan.dev under Windows 10)