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• Reading subtitle metadata from mpeg files using ffprobe

  26 septembre 2022, par Kaydee Dunlop

  I'm using ffmpeg or to be more specific ffprobe which is part of the ffmpeg toolstack to read subtitle information from a mpeg file. Anyway, I'm facing an issue I currently don't fully understand. If I use the following command :

  


  ffprobe -of json -show_streams -show_format


  


  I get back something like this :

  


      {
        "index": 6,
        "codec_name": "mov_text",
        "codec_long_name": "MOV text",
        "codec_type": "subtitle",
        "codec_tag_string": "tx3g",
        "codec_tag": "0x67337874",
        "width": 3840,
        "height": 240,
        "id": "0x6",
        "r_frame_rate": "0/0",
        "avg_frame_rate": "0/0",
        "time_base": "1/1000",
        "start_pts": 0,
        "start_time": "0.000000",
        "duration_ts": 6706616,
        "duration": "6706.616000",
        "bit_rate": "95",
        "nb_frames": "4028",
        "extradata_size": 48,
        "disposition": {
            "default": 0,
            "dub": 0,
            "original": 0,
            "comment": 0,
            "lyrics": 0,
            "karaoke": 0,
            "forced": 0,
            "hearing_impaired": 0,
            "visual_impaired": 0,
            "clean_effects": 0,
            "attached_pic": 0,
            "timed_thumbnails": 0,
            "captions": 0,
            "descriptions": 0,
            "metadata": 0,
            "dependent": 0,
            "still_image": 0
        },
        "tags": {
            "creation_time": "2022-09-11T01:02:33.000000Z",
            "language": "eng"
        }
    },


  


  you can see, I have several options that can be set for the disposition section, I'm especially interested in "forced" and "hearing_impaired". To set the value for these options I'm trying to use a tool called "Subler" which is a tool to metarise mpeg files and their containing tracks. But for some reason, ffprobe does not seem to match with the fields Subler sets... So I'm kind stuck as I'm never really able to find out if a subtitle track is forced, hearing_impaired (SDH) etc. Is there any kind of workaround for this problem, maybe an extra option I have to set with ffprobe or so ? Is there maybe an alternative tool that can ?

  


  If you are more interested into this issue I also uploaded a test scenario which has forced subtitles, normal subtitles and SDH subtitles properly set, it also contains screenshots and the raw SRT files, which are basically not needed as the subs are already embedded into the mp4 file, but just in case I also attached them.

  


  https://drive.google.com/file/d/1ZZ32i17A33Lhpn4a5BDg033yV9PbZhtS/view?usp=sharing

  


• Output a new mp3 file from a lengthy mp3 mix which previews the audio at 5 different points of the mix

  17 novembre 2020, par Paul Hinett

  I basically have a large collection of audio mix files in mp3 format, say approx 2 hours worth of music per mp3.

  


  I am trying to work out the best way using the command line to output a preview MP3 file, this mp3 should have 5-10 second previews of the full mix at 6 or so points during the mix.

  


  Example
00:00:10 - 00:00:20
00:30:00 - 00:30:10
00:50:00 - 00:50:10
...

  


  So with the small mp3 file, you can kind of get an idea of the whole mix in a very short preview.

  


  I have seen ffmpeg etc that can preview say 5 seconds up to 15 seconds of an audio, but not sure if this is capable of doing multiple points of the audio.

  


  Any ideas or help is appreciated.

  


• Can I extract .wav mono file from .mp4 using python without ffmpeg ? [closed]

  7 août 2022, par 1412 kaito

  I have been trying to find a way to extract .wav (mono) from a .mp4 file, I tried using pydub and wave like python modules, but they all require download/installation of ffmpeg.
Till now, I kind of learned that pydub, wave, ffmpeg-python like modules are using sys module to execute ffmpeg commands.