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• How to update this script to generate HLS video with different resolution streams ? [closed]

  1er décembre 2023, par Andy Z

  I have the following FFmpeg script :

  


  ffmpeg -i video.mp4 -i video.vtt \
 -map 0:v -map 0:a:0 -map 1 \
 -s:v:0 1080x1920 -c:v:0 h264 -b:v:0 500K \
 -c:a:0 copy -c:a:1 copy -c:a:2 copy -c:s webvtt \
 -f hls -hls_playlist_type vod -var_stream_map "v:0,a:0,s:0" \
 -master_pl_name video.m3u8 -hls_time 6 -hls_list_size 0 -hls_allow_cache 1 -start_number 1 \
 -hls_segment_filename "output/hls/%v/seg-%d.ts" output/hls/%v/index.m3u8


  


  Currently it only produces one 1080x1920 stream, how do I produce more lower resolution ones so it can adjust based on client bandwidth ?

  


  Also, I've noticed that it doesn't add the reference to the VTT file to the master HLS playlist ; I had to add this manually but is there a way to make FFmpeg do it for me ?

  


  #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subs",NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO,LANGUAGE="en",CHARACTERISTICS="public.accessibility.transcribes-spoken-dialog",URI="0/index_vtt.m3u8"


  


  I've tried this, but I get an argument error :

  


  ffmpeg -i video.mp4 -i video.vtt \
 -map 0:v -map 0:a:0 -map 1 \
 -s:v:0 1080x1920 -c:v:0 h264 -b:v:0 500K \
 -s:v:1 720x1280 -c:v:1 h264 -b:v:1 300K \
 -s:v:2 480x854 -c:v:2 h264 -b:v:2 150K \
 -c:a:0 copy -c:a:1 copy -c:a:2 copy -c:s webvtt \
 -f hls -hls_playlist_type vod -var_stream_map "v:0,a:0,s:0 v:1,a:1 s:1 v:2,a:2 s:2" \
 -master_pl_name video.m3u8 -hls_time 6 -hls_list_size 0 -hls_allow_cache 1 -start_number 1 \
 -hls_segment_filename "output/hls/%v/seg-%d.ts" output/hls/%v/index.m3u8


  


• subprocess.Popen can't find the file when shell=False and doesn't know ffmpeg when shell=True [duplicate]

  26 novembre 2023, par Waschbrettwade

  I am trying to get an offline speech-to-text library called "vosk" running following this tutorial : https://medium.com/@johnidouglasmarangon/automatic-speech-recognition-with-vosk-828569219f2b

  


  In this, subprocess.Popen is being used like this :

  


  ffmpeg_command = [
            "ffmpeg",
            "-nostdin",
            "-loglevel",
            "quiet",
            "-i",
            filename,
            "-ar",
            str(SAMPLE_RATE),
            "-ac",
            "1",
            "-f",
            "s16le",
            "-",
        ]

    with subprocess.Popen(ffmpeg_command, stdout=subprocess.PIPE) as process:


  


  When running this in Jupyter Notebook, no problem at all. But whenever I run this in VSCode, it produces the error :

  


  FileNotFoundError: [WinError 2] The system couldn't find the specified file (translated to English by me)


  


  When using shell=True as in

  


  with subprocess.Popen(ffmpeg_command, stdout=subprocess.PIPE, shell=True) as process:


  


  it tells me in the terminal (translated) :

  


  The command "ffmpeg" ist either written wrong or couldn't be found. 


  


  Do you have any idea what's causing these issues and how to fix them ?

  


• fluent-ffmpeg ffmpeg exited with code 1 : Unknown decoder 'h264_nvenc'

  3 juillet 2022, par zzzhim

        import { ipcMain } from "electron"
      import fluentFfmpeg from "fluent-ffmpeg"
      import ffmpegStaticElectron from "ffmpeg-static-electron"
      import ffprobeStaticElectron from "ffprobe-static-electron"

      const ffmpeg = fluentFfmpeg()
      ffmpeg.setFfmpegPath(ffmpegStaticElectron.path)
      ffmpeg.setFfprobePath(ffprobeStaticElectron.path)

      ffmpeg
        .input('0.mp4')
        .inputOption([
          "-hwaccel cuvid",
          // "-hwaccel_device 1",
          "-c:v h264_cuvid",
          "-c:v h264_nvenc",
        ])
        // .videoCodec("h264_nvenc")
        .outputOptions([
          '-map 0',
          '-f hls',
          '-hls_time 5',
          '-segment_time 5',
          '-hls_list_size 0',
          '-hls_segment_filename',
          `${tsFilePath}/%d.ts`
        ])
        .output(`${m3u8FilePath}/${name}.m3u8`)
        .on('start', (commandLine) => {
        })
        .on('error', (err, stdout, stderr) => {
          console.log(err, stdout, stderr)
        })
        .on('progress', (progress) => {

        })
        .on('end', (err, stdout, stderr) => {
      
          
        })
        .run()


  


  ffmpeg -codecs

  


  enter image description here
enter image description here
Sorry, my English is not very good !

  


  I want ffmpeg to use GPU hardware acceleration. The above is my code, but it has been executing incorrectly. This problem has plagued me for several days. I hope you can help me, thank you !