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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


  


• JavaCPP BytePointer OutOfMemory Error

  20 septembre 2016, par Tunahan Bayındır

  Sorry for bad English, not a native speaker.

  I am using sourab-sharma’s TouchToRecord library, available on github, I updated javacv and javacpp and now app crashes on video record with,

  java.lang.OutOfMemoryError: Cannot allocate 267850262 + 614403 bytes (> Pointer.maxBytes)
  
      at org.bytedeco.javacpp.Pointer.deallocator(Pointer.java:446)
  
      at org.bytedeco.javacpp.Pointer.init(Pointer.java:118)
  
      at org.bytedeco.javacpp.BytePointer.allocateArray(Native Method)
  
      at org.bytedeco.javacpp.BytePointer.<init>(BytePointer.java:82)
  
      at org.bytedeco.javacv.FFmpegFrameFilter.pushImage(FFmpegFrameFilter.java:265)
  
      at org.bytedeco.javacv.FFmpegFrameFilter.push(FFmpegFrameFilter.java:252)
  
      at org.bytedeco.javacv.FFmpegFrameFilter.push(FFmpegFrameFilter.java:248)
  
      at com.dodo.challenger.videorecorder.RecorderThread.processBytesUsingFrame(RecorderThread.java:186)
  
      at com.dodo.challenger.videorecorder.RecorderThread.processFramesFromList(RecorderThread.java:84)
  
      at com.dodo.challenger.videorecorder.RecorderThread.run(RecorderThread.java:59)
  
  </init>

  this. Have been working on 8 straight hours, no luck yet.

  JavaCpp version was : 1.1 - now : 1.2.4,

  JavaCv version was : 1.1 - now : 1.2.1

  Also this message appears on error trace just in version 1.2.4, below don’t have it.

  No implementation found for long org.bytedeco.javacpp.Pointer.physicalBytes()

• Subtitles in video with NodeJS and FFMpeg Fluent Api

  23 juillet 2016, par João Santiago

  I try to include subtitles (srt) in na vídeo stream with Node JS and FFMpeg... I’m try this away :

   var command = ffmpeg(file.createReadStream())
  
      .input("C:\\code.srt").videoCodec('copy')
  
    .videoCodec('libvpx').audioCodec('libvorbis').format('webm')
  
    .audioBitrate(128)
  
    .videoBitrate(1024)
  
      .inputFPS(75)
  
    .outputOptions([
  
      '-deadline realtime',
  
      '-error-resilient 1'
  
    ])

  And I got this error :

  [Error: ffmpeg exited with code 1: Encoder (codec none) not found for output stream #0:2

  Try this too, with —vf subititles= of documentation of FFMpeg and I’ve got this error :

  var command = ffmpeg(file.createReadStream())
  
        .videoCodec('libvpx').audioCodec('libvorbis').format('webm')
  
        .audioBitrate(128)
  
        .videoBitrate(1024)
  
          .inputFPS(75)
  
        .outputOptions([
  
          '-deadline realtime',
  
          '-vf subtitles=C:\\code.srt',
  
          '-error-resilient 1'
  
        ])
  
  
  
  Error: ffmpeg exited with code 1: Error opening filters!

  Someone knows a away of embed subtitles in vídeo with FFMpeg Fluent Api in Node.JS

  Sorry my English, I’m Brazilian ! Thank’s so much