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• Converting MKV to MP4

  31 août 2020, par BrxDgr8t

  So I am trying to convert a really long video from MKV to MP4.
I tried this command first which is supposed to be the fastest way to convert mkv to mp4

  


  ffmpeg -i "vid.mkv" -codec copy -map 0 "MP4/vid.mp4"

  


  however I am getting this error everytime I run it

  


  [mp4 @ 0x7fffe98ae500] track 1: codec frame size is not set
[mp4 @ 0x7fffe98ae500] opus in MP4 support is experimental, add '-strict -2' if you want to use it.
Could not write header for output file #0 (incorrect codec parameters ?): Experimental feature
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
    Last message repeated 1 times


  


  What am I doing wrong ?

  


• ffprobe : add missing separator when printing side data in compact output

  20 décembre 2021, par James Almer

  ffprobe : add missing separator when printing side data in compact output
  Should fix ticket #7153
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] fftools/ffprobe.c
  • [DH] tests/ref/fate/concat-demuxer-simple1-lavf-mxf
  • [DH] tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10
  • [DH] tests/ref/fate/concat-demuxer-simple2-lavf-ts
  • [DH] tests/ref/fate/flv-demux
  • [DH] tests/ref/fate/gapless-mp3-side-data
  • [DH] tests/ref/fate/gaplessenc-itunes-to-ipod-aac
  • [DH] tests/ref/fate/gaplessenc-pcm-to-mov-aac
  • [DH] tests/ref/fate/gaplessinfo-itunes1
  • [DH] tests/ref/fate/gaplessinfo-itunes2
  • [DH] tests/ref/fate/mov-aac-2048-priming
  • [DH] tests/ref/fate/mov-zombie
  • [DH] tests/ref/fate/oggopus-demux
  • [DH] tests/ref/fate/ts-demux
  • [DH] tests/ref/fate/ts-opus-demux
  • [DH] tests/ref/fate/ts-small-demux

• FFMpeg : Adding subtitles to Dash MPD

  19 juillet 2022, par Solaris

  TL ;DR How to include subs while generating mpd with ffmpeg dash

  


  I am trying to convert mkv multi audio/subs files to dash mpd. Referring to the ffmpeg docs for dash Current progress is I have working mpd with multiple audio. But no clue on how to include subs/captions.

  


  ffmpeg -re -y -i input.mkv -map 0:0 -map 0:1 -map 0:2 -c:a aac -c:v libx264 \ -b:v:0 800k -b:v:1 300k -s:v:1 1280x720 \ -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \ -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \ -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=1 id=1,streams=2" \ -f dash out4/out.mpd


  


  What have I tried ?

  


  ffmpeg -re -y -i input-kaisen.mkv -map 0:0 -map 0:1 -map 0:2 \
-map 0:3 -c:s webvtt \
-c:a aac -c:v libx264 \
-b:v:0 800k -s:v:0 1280x720 \
-bf 1 -keyint_min 120 -g 120 -sc_threshold 0 \
-b_strategy 0 -ar:a:1 22050 -use_timeline 1 -use_template 1 \
-window_size 5 -adaptation_sets "id=0,streams=0 id=1,streams=1 id=2,streams=2 id=3,streams=3" \
-f dash outNull/out.mpd


  


  Throws error Could not find tag for codec webvtt in stream #0, codec not currently supported in container

  


  Reference for Stream mapping :

  


    Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  Stream #0:2 -> #0:2 (opus (native) -> aac (native))
  Stream #0:3 -> #0:3 (ass (ssa) -> webvtt (native))


  


  Edit1 : Made some progress , ffmpeg is not recognizing webvtt cause its using mp4 container , thus changed the container to webm with -dash_segment_type webm and switched vcodec to vp9 , acodec to opus
But that aint a solution as I need to support x264 vcodec.
Multiple -dash_segment_type didnt help