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  • In ffmpeg, how do I scale dvdsub subtitles to match video size, using scale2ref filter ?

    24 janvier 2017, par Steve Moseley

    I have an mpeg file, recorded from live TV, containing video and multiple audio and subtitles streams. My eventual goal is to be able to create a smaller video file as the mpeg file is multi-gigabytes in size. My first step on that path is just to be able to select one each of the video, audio and subtitle streams and copy them to an mkv file, discarding the streams I’m not interested in. (I chose mkv as it will allow storing a dvdsub subtitle stream where other container formats wont.)

    The problem I’m having is that the dvdsub subtitles appear very small when I play the output video, when I researched this I found that ffmpeg doesn’t automatically scale the subtitles to match the source video : https://trac.ffmpeg.org/ticket/4744

    I have tried using the scale2ref filter, but I don’t understand the documentation, and the example they give makes no sense to me (see examples below).

    I have a command that selects the three streams and copies 1 minute to the output, as follows :

    ffmpeg -ss 00:28:00.200 -i Hillary-2016-08-21.mpg -t 00:01:00.000 -map 0:0 -c:v copy -map 0:3 -c:a copy -map 0:6 -c:s dvdsub cut.mkv

    Here’s the output :

    Input #0, mpegts, from 'Hillary-2016-08-21.mpg':
    
  Duration: 01:30:00.06, start: 20852.199389, bitrate: 6813 kb/s
    
  Program 1 
    
    Stream #0:0[0xfa]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
    
    Stream #0:1[0x12c](eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
    
    Stream #0:2[0x131](ita): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp (visual impaired)
    
    Stream #0:3[0x191](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
    
    Stream #0:4[0x3ea]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:5[0x3ec]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:6[0x3fc](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006) (hearing impaired)
    
    Stream #0:7[0x1f40]: Unknown: none ([5][0][0][0] / 0x0005)
    
File 'cut.mkv' already exists. Overwrite ? [y/N] y
    
Output #0, matroska, to 'cut.mkv':
    
  Metadata:
    
    encoder         : Lavf57.56.100
    
    Stream #0:0: Video: h264 (Main) (H264 / 0x34363248), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 50 tbr, 1k tbn, 90k tbc
    
    Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), 384 kb/s
    
    Stream #0:2(eng): Subtitle: dvd_subtitle (dvdsub) (hearing impaired)
    
    Metadata:
    
      encoder         : Lavc57.64.101 dvdsub
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:3 -> #0:1 (copy)
    
  Stream #0:6 -> #0:2 (dvb_subtitle (dvbsub) -> dvd_subtitle (dvdsub))
    
Press [q] to stop, [?] for help
    
frame= 2956 fps=0.0 q=-1.0 Lsize=   39612kB time=00:00:59.99 bitrate=5408.7kbits/s speed= 216x    
    
video:36702kB audio:2896kB subtitle:23kB other streams:0kB global headers:0kB muxing overhead: unknown

    The documentation for scale2ref gives an example with an overlay, and I don’t want to overlay anything, I just want to resize the subtitles stream. Here’s their example :

    'scale2ref[b][a];[a][b]overlay'

    The closest I’ve got is something like this :

    ffmpeg -ss 00:28:00.200 -i Hillary-2016-08-21.mpg -t 00:01:00.000 -map 0:0 -c:v copy -map 0:3 -c:a copy -filter_complex "[0:6]scale2ref[b]" -map "[b]"   cut.mkv

    And the output is :

    Input #0, mpegts, from 'Hillary-2016-08-21.mpg':
    
  Duration: 01:30:00.06, start: 20852.199389, bitrate: 6813 kb/s
    
  Program 1 
    
    Stream #0:0[0xfa]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
    
    Stream #0:1[0x12c](eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
    
    Stream #0:2[0x131](ita): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp (visual impaired)
    
    Stream #0:3[0x191](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
    
    Stream #0:4[0x3ea]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:5[0x3ec]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:6[0x3fc](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006) (hearing impaired)
    
    Stream #0:7[0x1f40]: Unknown: none ([5][0][0][0] / 0x0005)
    
Streamcopy requested for output stream 0:0, which is fed from a complex filtergraph. Filtering and streamcopy cannot be used together.

    And I don’t really understand how I can use a filter and direct my resized subtitle stream into the output file.

    Any help appreciated ! Thanks !

  • In ffmpeg, how do I scale dvdsub subtitles to match video size, using scale2ref filter ?

    31 décembre 2017, par Steve Moseley

    I have an mpeg file, recorded from live TV, containing video and multiple audio and subtitles streams. My eventual goal is to be able to create a smaller video file as the mpeg file is multi-gigabytes in size. My first step on that path is just to be able to select one each of the video, audio and subtitle streams and copy them to an mkv file, discarding the streams I’m not interested in. (I chose mkv as it will allow storing a dvdsub subtitle stream where other container formats wont.)

    The problem I’m having is that the dvdsub subtitles appear very small when I play the output video, when I researched this I found that ffmpeg doesn’t automatically scale the subtitles to match the source video : https://trac.ffmpeg.org/ticket/4744

    I have tried using the scale2ref filter, but I don’t understand the documentation, and the example they give makes no sense to me (see examples below).

    I have a command that selects the three streams and copies 1 minute to the output, as follows :

    ffmpeg -ss 00:28:00.200 -i Hillary-2016-08-21.mpg -t 00:01:00.000 -map 0:0 -c:v copy -map 0:3 -c:a copy -map 0:6 -c:s dvdsub cut.mkv

    Here’s the output :

    Input #0, mpegts, from 'Hillary-2016-08-21.mpg':
    
  Duration: 01:30:00.06, start: 20852.199389, bitrate: 6813 kb/s
    
  Program 1 
    
    Stream #0:0[0xfa]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
    
    Stream #0:1[0x12c](eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
    
    Stream #0:2[0x131](ita): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp (visual impaired)
    
    Stream #0:3[0x191](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
    
    Stream #0:4[0x3ea]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:5[0x3ec]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:6[0x3fc](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006) (hearing impaired)
    
    Stream #0:7[0x1f40]: Unknown: none ([5][0][0][0] / 0x0005)
    
File 'cut.mkv' already exists. Overwrite ? [y/N] y
    
Output #0, matroska, to 'cut.mkv':
    
  Metadata:
    
    encoder         : Lavf57.56.100
    
    Stream #0:0: Video: h264 (Main) (H264 / 0x34363248), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 50 tbr, 1k tbn, 90k tbc
    
    Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), 384 kb/s
    
    Stream #0:2(eng): Subtitle: dvd_subtitle (dvdsub) (hearing impaired)
    
    Metadata:
    
      encoder         : Lavc57.64.101 dvdsub
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:3 -> #0:1 (copy)
    
  Stream #0:6 -> #0:2 (dvb_subtitle (dvbsub) -> dvd_subtitle (dvdsub))
    
Press [q] to stop, [?] for help
    
frame= 2956 fps=0.0 q=-1.0 Lsize=   39612kB time=00:00:59.99 bitrate=5408.7kbits/s speed= 216x    
    
video:36702kB audio:2896kB subtitle:23kB other streams:0kB global headers:0kB muxing overhead: unknown

    The documentation for scale2ref gives an example with an overlay, and I don’t want to overlay anything, I just want to resize the subtitles stream. Here’s their example :

    'scale2ref[b][a];[a][b]overlay'

    The closest I’ve got is something like this :

    ffmpeg -ss 00:28:00.200 -i Hillary-2016-08-21.mpg -t 00:01:00.000 -map 0:0 -c:v copy -map 0:3 -c:a copy -filter_complex "[0:6]scale2ref[b]" -map "[b]"   cut.mkv

    And the output is :

    Input #0, mpegts, from 'Hillary-2016-08-21.mpg':
    
  Duration: 01:30:00.06, start: 20852.199389, bitrate: 6813 kb/s
    
  Program 1 
    
    Stream #0:0[0xfa]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
    
    Stream #0:1[0x12c](eng): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
    
    Stream #0:2[0x131](ita): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp (visual impaired)
    
    Stream #0:3[0x191](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
    
    Stream #0:4[0x3ea]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:5[0x3ec]: Unknown: none ([11][0][0][0] / 0x000B)
    
    Stream #0:6[0x3fc](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006) (hearing impaired)
    
    Stream #0:7[0x1f40]: Unknown: none ([5][0][0][0] / 0x0005)
    
Streamcopy requested for output stream 0:0, which is fed from a complex filtergraph. Filtering and streamcopy cannot be used together.

    And I don’t really understand how I can use a filter and direct my resized subtitle stream into the output file.

    Any help appreciated ! Thanks !

  • ffmpeg : `ffmpeg -i "/video.mp4" -i "/audio.m4a" -c copy -map 0:v:0 -map 1:a:0 -shortest "/nu.mp4"` truncates, how to loop audio to match videos ? [closed]

    18 avril 2024, par Swudu Susuwu

    This is with "FFmpeg Media Encoder" from Google Store (Linux-based Android OS), but it has all the commands of ffmpeg for normal Linux.

    


    -shortest truncates the video to match the audio, and -longest has the last half of the video not have audio (for videos twice as long as audio,)

    


    what to use to loop audio (to match length of video with this) ?

    


    Video length is 15:02, so used ffmpeg -i "/audio.m4a" -c copy -map 0:a:0 "/audionew.m4a"-t 15:02 -stream_loop -1`, but got errors.

    


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