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• How can I automate the subtitle adding process in FFMPEG ?

  23 septembre 2022, par Phoeniqz

  The situation is, that I have 10 MP4 videos and a folder for each of them that has the same name as its video. In each of folders there are around 30 SRT files I need to add. I would like to automate this. I mean a script that would add each SRT file to the video and add the correct handler for the subtitles, so that the subtitle would appear as "English" instead of "Subtitle #12" in a movie player. I made a python script ; it's far from perfect and it does not add the handlers correctly.

  


  The name of each SRT file is something like "20_Hebrew.srt"

  


  

import os
file_dir = r"Path/to/my/files"
sub_dir = file_dir + "/Subs"


def add_sub(file, file_name):
    cmd = f"ffmpeg -i '{file}' "
    sub_list = []

    no_extension = file_name.replace(".mp4", "")

    for sub_name in os.listdir(sub_dir + f"/{no_extension}"):
        s = os.path.join(sub_dir + f"/{no_extension}", sub_name)

        if os.path.isfile(s):
            cmd += f"-i '{s}' "
            sub_list.append(s)
    
    cmd += "-map 0:v -map 0:a "

    for i, v in enumerate(sub_list):
        cmd += f"-map {i+1} "
    
    cmd += "-c:v copy -c:a copy "

    for i, v in enumerate(sub_list):
        sub_lang = v.replace(".srt", "")
        index = sub_lang.index(f"/Subs/")
        sub_lang = sub_lang[index:]
        index = sub_lang.index("_")
        sub_lang = sub_lang[index+1:]

        cmd += f"-c:s:{i} mov_text -metadata:s:s:{i} language='{sub_lang}' -metadata:s:s:{i} handler='{sub_lang}' "

    cmd += f"'{file}_OUTP.mp4'"

    os.system(cmd)

for file_name in os.listdir(file_dir):
    f = os.path.join(file_dir, file_name)

    if os.path.isfile(f):
        add_sub(f, file_name) 

  


• Stream mp4 videos in different languages (ExpressJs)

  23 mars 2021, par Bennet

  I use the following code to stream videos (just in my local network). In my mp4 files are several audio tracks with different languages. Is it possible to select a specific audio track to stream ? For example, that you specify a language as query parameter in the URL, and the streamed video has the selected audio track.

  


  Example 1 :
  
URL : "localhost/video ?lang=en"
  
Video : English audio track

  


  Example 2 :
  
URL : "localhost/video ?lang=de"
  
Video : German audio track

  


  Maybe you can remove all unneeded audio tracks in the stream with ffmpeg (https://www.npmjs.com/package/ffmpeg) ?

  


  Working expressjs code/example :
https://betterprogramming.pub/video-stream-with-node-js-and-html5-320b3191a6b6
(https://gist.github.com/BetterProgramming/3bf5d66b0285a2690de684d46c4cabb4#file-app-get-js)

  


• How can I call m3u8 with multiple audio

  26 février 2020, par desmeit

  I have the following playlist.m3u8 with multiple audio :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  
  
  #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",LANGUAGE="fr",NAME="France",AUTOSELECT=NO,URI="fr/test.m3u8"
  
   #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="audio",LANGUAGE="en",NAME="English",AUTOSELECT=NO,URI="en/test.m3u8"
  
  
  
  #EXT-X-STREAM-INF:BANDWIDTH=800000,RESOLUTION=360x640,AUDIO="audio"
  
  640p.m3u8
  
  #EXT-X-STREAM-INF:BANDWIDTH=1400000,RESOLUTION=480x842,AUDIO="audio"
  
  842p.m3u8
  
  #EXT-X-STREAM-INF:BANDWIDTH=2800000,RESOLUTION=720x1280,AUDIO="audio"
  
  1280p.m3u8
  
  #EXT-X-STREAM-INF:BANDWIDTH=5000000,RESOLUTION=1080x1920,AUDIO="audio"
  
  1920p.m3u8

  if I only call the URL http://XXX.playlist.m3u8, the french audio file is played automatically. I know that the selection of the language in the native player at Apple is displayed like this :

  

  Is there an additional possibility to select the language for example by parameters ?

  http://XXX.playlist.m3u8?LANGUAGE=DE for example

  And is it possible to run two audio files in parallel ?