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• How to set custom handler_name metadata for subtitle stream using FFMPEG

  9 mars 2021, par AWainb

  I'm currently using FFMPEG to embed subtitles into my MP4 files and I am stumped trying to figure out how to custom set the "handler_name" metadata tag on my subtitle stream so I can control the name that is displayed when selecting the subtitle within a player like MPC-HC (Media Player Classic) ?

  



  My current command to embed the subtitle is :

  



  ffmpeg -i "video.mp4" -sub_charenc UTF-8 -i "video.srt" -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=eng -metadata:s:s:0 handler_name="English" -id3v2_version 3 -write_id3v1 1 "subbed_video.mp4"


  



  Output :

  



  C:\path\to>ffmpeg -y -i "video.mp4" -sub_charenc UTF-8 -i "video.srt" -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language="eng" -metadata:s:s:0 handler_name="English" -id3v2_version 3 -write_id3v1 1 "subbed_video.mp4"
ffmpeg version N-68482-g92a596f Copyright (c) 2000-2014 the FFmpeg developers
  built on Dec 16 2014 02:53:08 with gcc 4.9.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable
  libavutil      54. 15.100 / 54. 15.100
  libavcodec     56. 15.100 / 56. 15.100
  libavformat    56. 15.105 / 56. 15.105
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  3.101 /  5.  3.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.34.101
  Duration: 01:27:44.17, start: 0.000000, bitrate: 878 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x536 [SAR 1:1 DAR 160:67], 842 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:2(eng): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s (default)
    Metadata:
      handler_name    : SubtitleHandler
Input #1, srt, from 'video.srt':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Subtitle: subrip
Output #0, mp4, to 'subbed_video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.15.105
    Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x536 [SAR 1:1 DAR 160:67], q=2-31, 842 kb/s, 24 fps, 24 tbr, 12288 tbn, 12288 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:2(eng): Subtitle: mov_text ([8][0][0][0] / 0x0008) (default)
    Metadata:
      handler_name    : English
      encoder         : Lavc56.15.100 mov_text
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
  Stream #0:2 -> #0:2 (mov_text (native) -> mov_text (native))
Press [q] to stop, [?] for help
frame=126337 fps=13751 q=-1.0 Lsize=  564499kB time=01:27:44.17 bitrate= 878.5kbits/s
video:541239kB audio:20564kB subtitle:39kB other streams:0kB global headers:0kB muxing overhead: 0.472881%


  



  The command completes sucessfully, but when I run :

  



  ffmpeg -i "C:\path\to\subbed_video.mp4"


  



  it shows :

  



  Stream #0:2(eng): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s (default)
Metadata:
  handler_name    : SubtitleHandler


  



  Even though the output from the command shows :

  



  Stream #0:2(eng): Subtitle: mov_text ([8][0][0][0] / 0x0008) (default)
Metadata:
  handler_name    : English
  encoder         : Lavc56.15.100 mov_text


  



  No matter what options I have tried or what order I place the -metadata tags in, this tag simply will not set with FFMPEG ? I find it really ugly to see SubtitleHandler [eng] (tx3g) (English) within my player's menu instead of simply saying English.

  



  Now, I can work around this issue by using MP4BOX to embed the subtitles into my mp4's using :

  



  MP4BOX -lang eng -add "video.srt:name=English" "video.mp4" -out "subbed_video.mp4"


  



  Adding "name=English" allows me to set the subtitle stream's "handler_name" to "English" ; which displays perfectly in FFMPEG and MPC-HC, but the problem is that I do not want my app to be dependent on an additional external tool like MP4BOX if it can be avoided ?

  



  I would greatly appreciate any advice regarding how to properly set the "handler_name" tag on my subtitle stream using FFMPEG, or maybe a confirmation as to whether FFMPEG can even handle this tag seeing as it is not technically listed in FFMPEG's valid metadata tag list ?

  



  P.S. As an alternative to FFMPEG, I would be willing to use AtomicParsley to set the "handler_name" as I will already be using it to set advanced metadata on the "subbed_video.mp4" after I embed the subtitles. It does seem like it would be possible to do with AtomicParsley, but I have not been able to understand half the help information with regards to setting custom ATOM's.

  



  TIA !!

  


• Ffmpeg : Output a video made of several video chunks of the input video

  20 mai 2013, par mad

  I was wondering if it was possible to output a video made of several extracts of the input video.
  For example outputting a video made of the first 10s of each minute of the input.

  I know you can do it programmatically, calling several time ffmpeg with -ss and -t to make the chunks and then merge them, but is it possible to do it in one command using video filters ?

  Thanks !

• FFMEPG：Why does the video sound become smaller when I use pictures and wavs to compose a video, and there is less audio at the beginning of the video ?

  13 novembre 2022, par Naldo hwang

  ffmpeg.exe -r 10 -loop 1 -i 5197.jpg -i audio5197.wav -c:v libx264 -x264-params keyint=1:scenecut=0 -c:a aac -b:a 32k -pix_fmt yuvj420p -shortest out.mp4

  


  I'm trying to make a video with a picture and 7 hours of wav,There is always a few seconds less audio at the beginning of the video, and the sound becomes smaller.

  


  Thanks for reading and help.