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• How to embed subtitles in multiple movies in an automated way using python ?

  8 juin 2023, par Ricardo Madela

  This python script identifies all movies with mp4 extension and, if they have subtitles in srt format, converts the subtitle encoding to utf-8 (without this conversion you will get error message) and starts building the movie with the subtitle embedded.

  


  for filename in glob.glob("*.mp4"):
    print(str(filename))
    if 'wsubs' not in filename:
        for legenda in glob.glob(filename.replace(".mp4",".srt")):
            try:
                with open(legenda, 'r') as arquivo_orig:
                    conteudo = arquivo_orig.read()
                with open(legenda, 'w', encoding='utf-8') as novo_arquivo:
                    novo_arquivo.write(conteudo)
            except Exception as e:
                print("Já codificado")
            print(str(legenda))
            os.system('ffmpeg -i "' + str(filename) + '" -vf subtitles="' + str(legenda) + '" -maxrate 2000000 -crf 20 "' + str(filename.replace('.mp4','-wsubs.mp4')) + '"')


  


  The end result will be a subtitled movie with the expression "wsubs" at the end of the name. The original files will be preserved.

  


• PHP-FFMpeg video output is truncated

  25 juin 2019, par showdev

  I’m using the PHP-FFMpeg library found here and code from the "Basic Usage" section.

  The outputted video seems to be truncated. I’m using a source video that’s 28 seconds long, but the output is only 9 seconds. What’s going wrong ?

  Here, I’m checking the duration of the source video :

  $ffprobe = FFMpeg\FFProbe::create();
  
  $duration = $ffprobe
  
    ->format('test/source.mp4')
  
    ->get('duration');

  28.700000

  Then generating an output video :

  $ffmpeg = FFMpeg\FFMpeg::create();
  
  $video = $ffmpeg->open('test/source.mp4');
  
  $video->save(new FFMpeg\Format\Video\X264(), 'test/export.mp4');

  Then checking the duration of the output video :

  $ffprobe = FFMpeg\FFProbe::create();
  
  $duration = $ffprobe
  
    ->format('test/export.mp4')
  
    ->get('duration');

  9.234000

• How to create a script on a Raspberry to run ffmpeg at boot and restart itself if/when ffmpeg fails ?

  5 février 2021, par Mycelium

  I'm using a Raspberry Pi Zero to stream to YouTube using FFMPEG. It works great so far and now I'd like to set it up to run the stream/FFMPEG daily and automatically from 6am to 7pm and restart itself in case it fails.

  


  I've heard/read of people doing so with Python, but I haven't been able to find examples to try. I've never used Python (or any other) before, I'm a complete beginner. All I know is how/where to place the script file to make it run at boot.

  


  Could anyone point me in the right direction on how to achieve this ? The FFMPEG command is as follows :

  


  v4l2-ctl --set-fmt-video=width=1280,height=720,pixelformat=4 
v4l2-ctl --set-ctrl=rotate=180
v4l2-ctl --overlay=1
v4l2-ctl -p 30
v4l2-ctl --set-ctrl=video_bitrate=2000000
ffmpeg -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -i /dev/zero -f h264 -framerate 30 -i /dev/video0 -vcodec copy -acodec aac -ab 128k -g 60 -f flv -r 30 rtmp://a.rtmp.youtube.com/live2/SECRET-KEY