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• ffmpeg doesn't detect the subtitle format (webvtt) and refuses to copy it

  29 novembre 2023, par Thomas

  I am trying to re-encode the audio on some video files.
I want to copy the video and subtitles without touching them, however, ffmpeg doesn't detect the format of the subtitle (which is webvtt) and refuses to do anything.

  



  fmpeg -copy_unknown -analyzeduration 2000M -probesize 2000M -i input.mkv -map_metadata 0 -map 0 -c copy -c:a:0 aac -b:a 384k output.mkv

  



  [matroska,webm @ 0x5597558e4040] Unknown/unsupported AVCodecID S_TEXT/WEBVTT.
[matroska,webm @ 0x5597558e4040] Could not find codec parameters for stream 2 (Subtitle: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for Input Stream #0.1 : 5.1
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    encoder         : libebml v1.3.9 + libmatroska v1.5.2
    creation_time   : 2020-03-05T09:03:02.000000Z
  Duration: 00:56:33.26, start: 0.000000, bitrate: 3597 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      BPS-eng         : 3340067
      DURATION-eng    : 00:56:33.140000000
      NUMBER_OF_FRAMES-eng: 81354
      NUMBER_OF_BYTES-eng: 1416664616
      _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1: Audio: eac3, 48000 Hz, 5.1, fltp (default)
    Metadata:
      BPS-eng         : 256000
      DURATION-eng    : 00:56:33.248000000
      NUMBER_OF_FRAMES-eng: 106039
      NUMBER_OF_BYTES-eng: 108583936
      _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Subtitle: none (default)
    Metadata:
      BPS-eng         : 38
      DURATION-eng    : 00:54:47.388000000
      NUMBER_OF_FRAMES-eng: 514
      NUMBER_OF_BYTES-eng: 15766
      _STATISTICS_WRITING_APP-eng: mkvmerge v38.0.0 ('The Silent Type') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-03-05 09:03:02
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (eac3 (native) -> aac (native))
  Stream #0:2 -> #0:2 (copy)

[aac @ 0x5597b06ae000] Using a PCE to encode channel layout "5.1(side)"
[matroska @ 0x5597b06ab540] Subtitle codec 0 is not supported.
Could not write header for output file #0 (incorrect codec parameters ?): Function not implemented
Error initializing output stream 0:1 -- 
[aac @ 0x5597b06ae000] Qavg: -nan
Conversion failed!


  



  VLC shows it as WebVTT and displays the subtitles correctly :

  



  

  



  MediaInfo also detects properly as webvtt :

  



  Text
ID                                       : 3
Format                                   : S_TEXT/WEBVTT
Codec ID                                 : S_TEXT/WEBVTT
Duration                                 : 54 min 47 s
Bit rate                                 : 38 b/s
Count of elements                        : 514
Stream size                              : 15.4 KiB (0%)
Language                                 : English
Default                                  : Yes
Forced                                   : No


  



  My ffmpeg was built with webvtt :

  



  $ ffmpeg -codecs | grep VTT
ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.3.0 (Arch Linux 9.3.0-1)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
 DES... webvtt               WebVTT subtitle


  



  How can I tell ffmpeg "this is webvtt, just copy it please !" ?

  



  EDIT : RESOLVED (thanks @Gyan)

  



  To force the decoder, -c:s webvtt must be set before the input :
fmpeg -analyzeduration 50M -probesize 50M -c:s webvtt -i input.mkv ...

  


• How Can I Copy Encoder and Metadata from Another Video

  27 juillet 2022, par Alper Can

  I have a video, generated with Opencv.
I want make video metadata and encoder settings like another video. How can I make it ?

  


  My video :
  
ffmpeg output :

  


  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output/fixed.mp4' :
  
Metadata :
  
compatible_brands : isommp42
  
major_brand : mp42
  
minor_version : 0
  
creation_time : 2022-03-03T19:12:13.000000Z
  
com.android.version : 11
  
encoder : Lavf59.16.100
  
Duration : 00:00:06.00, start : 0.000000, bitrate : 6683 kb/s
  
Stream #0:00x1 : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(progressive), 640x480 [SAR 1:1 DAR 4:3], 6681 kb/s, 30.03 fps, 30.03 tbr, 30030 tbn (default)
  
Metadata :
  
creation_time : 2022-03-03T19:12:13.000000Z
  
handler_name : VideoHandler
  
vendor_id : [0][0][0][0]
  
Side data :
  
displaymatrix : rotation of 90.00 degrees

  


  


  Media Info output :

  


  


  General
  
Complete name : fixed.mp4
  
Format : MPEG-4
  
Format profile : Base Media
  
Codec ID : isom (isom/iso2/avc1/mp41)
  
File size : 4.78 MiB
  
Duration : 5 s 995 ms
  
Overall bit rate : 6 683 kb/s
  
Encoded date : UTC 2022-03-03 19:12:13
  
Tagged date : UTC 2022-03-03 19:12:13
  

  
Video
  
ID : 1
  
Format : AVC
  
Format/Info : Advanced Video Codec
  
Format profile : Baseline@L3
  
Format settings : 1 Ref Frames
  
Format settings, CABAC : No
  
Format settings, Reference frames : 1 frame
  
Codec ID : avc1
  
Codec ID/Info : Advanced Video Coding
  
Duration : 5 s 995 ms
  
Bit rate : 6 682 kb/s
  
Width : 640 pixels
  
Height : 480 pixels
  
Display aspect ratio : 4:3
  
Rotation : 270°
  
Frame rate mode : Constant
  
Frame rate : 30.000 FPS
  
Color space : YUV
  
Chroma subsampling : 4:2:0
  
Bit depth : 8 bits
  
Scan type : Progressive
  
Bits/(Pixel*Frame) : 0.725
  
Stream size : 4.77 MiB (100%)
  
Encoded date : UTC 2022-03-03 19:12:13
  
Tagged date : UTC 2022-03-03 19:12:13
  
Codec configuration box : avcC
  

  


  


  I want change it like this :
  
ffmpeg output :

  


  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output/source_encoder/video.mp4' :
  
Metadata :
  
major_brand : mp42
  
minor_version : 0
  
compatible_brands : isommp42
  
creation_time : 2022-03-03T19:12:13.000000Z
  
com.android.version : 11
  
Duration : 00:00:04.83, start : 0.000000, bitrate : 1020 kb/s
  
Stream #0:00x1 : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 640x480, 1016 kb/s, SAR 1:1 DAR 4:3, 30.03 fps, 30 tbr, 90k tbn (default)
  
Metadata :
  
creation_time : 2022-03-03T19:12:13.000000Z
  
handler_name : VideoHandle
  
vendor_id : [0][0][0][0]
  
Side data :
  
displaymatrix : rotation of 90.00 degrees

  


  


  Media Info Output :

  


  


  General
  
Complete name : source_encoder/video.mp4
  
Format : MPEG-4
  
Format profile : Base Media / Version 2
  
Codec ID : mp42 (isom/mp42)
  
File size : 601 KiB
  
Duration : 4 s 828 ms
  
Overall bit rate : 1 020 kb/s
  
Encoded date : UTC 2022-03-03 19:12:13
  
Tagged date : UTC 2022-03-03 19:12:13
  
com.android.version : 11
  

  
Video
  
ID : 1
  
Format : AVC
  
Format/Info : Advanced Video Codec
  
Format profile : High@L3
  
Format settings : CABAC / 1 Ref Frames
  
Format settings, CABAC : Yes
  
Format settings, Reference frames : 1 frame
  
Format settings, GOP : M=1, N=30
  
Codec ID : avc1
  
Codec ID/Info : Advanced Video Coding
  
Duration : 4 s 828 ms
  
Bit rate : 1 016 kb/s
  
Width : 640 pixels
  
Height : 480 pixels
  
Display aspect ratio : 4:3
  
Rotation : 270°
  
Frame rate mode : Variable
  
Frame rate : 30.000 FPS
  
Minimum frame rate : 30.000 FPS
  
Maximum frame rate : 30.060 FPS
  
Color space : YUV
  
Chroma subsampling : 4:2:0
  
Bit depth : 8 bits
  
Scan type : Progressive
  
Bits/(Pixel*Frame) : 0.110
  
Stream size : 599 KiB (100%)
  
Title : VideoHandle
  
Language : English
  
Encoded date : UTC 2022-03-03 19:12:13
  
Tagged date : UTC 2022-03-03 19:12:13
  
Color range : Limited
  
Color primaries : BT.709
  
Transfer characteristics : BT.709
  
Matrix coefficients : BT.709
  
mdhd_Duration : 4828
  
Codec configuration box : avcC
  

  


  


• MPEG-DASH - Multiplexed Representations Issue

  26 avril 2017, par Mike

  I’m trying to learn ffmpeg, MP4Box, and MPEG-DASH, but I’m running into an issue with the .mp4 I’m using. I’m using ffmpeg to demux the mp4 with this command :

  ffmpeg -i test.mp4 -c:v copy -g 72 -an video.mp4 -c:a copy audio.mp4

  Once the two files are created, I use MP4Box to segment the files for the dash player using this command :

  MP4Box -dash 4000 -frag 1000 -rap -segment-name segment_ output.mp4

  Which does create all the files I think I need. Then I point the player to the output_dash.mpd and nothing happens except a ton of messages in the console :

  [8] EME detected on this user agent! (ProtectionModel_21Jan2015) 
  
  [11] Playback Initialized 
  
  [21] [dash.js 2.3.0] MediaPlayer has been initialized 
  
  [64] Parsing complete: ( xml2json: 3.42ms, objectiron: 2.61ms, total: 0.00603s) 
  
  [65] Manifest has been refreshed at Wed Apr 12 2017 12:16:52 GMT-0600 (MDT)[1492021012.196]  
  
  [72] MediaSource attached to element.  Waiting on open... 
  
  [77] MediaSource is open! 
  
  [77] Duration successfully set to: 148.34 
  
  [78] Added 0 inline events 
  
  [78] No video data. 
  
  [79] No audio data. 
  
  [79] No text data. 
  
  [79] No fragmentedText data. 
  
  [79] No embeddedText data. 
  
  [80] Multiplexed representations are intentionally not supported, as they are not compliant with the DASH-AVC/264 guidelines 
  
  [81] No streams to play.

  Here is the MP4Box -info on the video I’m using :

  * Movie Info *
  
      Timescale 1000 - Duration 00:02:28.336
  
      Fragmented File no - 2 track(s)
  
      File suitable for progressive download (moov before mdat)
  
      File Brand mp42 - version 512
  
      Created: GMT Wed Feb  6 06:28:16 2036
  
  
  
  File has root IOD (9 bytes)
  
  Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
  
  Visual PL: Not part of MPEG-4 Visual profiles (0xfe)
  
  Audio PL: Not part of MPEG-4 audio profiles (0xfe)
  
  No streams included in root OD
  
  
  
  iTunes Info:
  
      Name: Rogue One - A Star Wars Story
  
      Artist: Lucasfilm
  
      Genre: Trailer
  
      Created: 2016
  
      Encoder Software: HandBrake 0.10.2 2015060900
  
      Cover Art: JPEG File
  
  
  
  Track # 1 Info - TrackID 1 - TimeScale 90000 - Duration 00:02:28.335
  
  Media Info: Language "Undetermined" - Type "vide:avc1" - 3552 samples
  
  Visual Track layout: x=0 y=0 width=1920 height=816
  
  MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
  
  AVC/H264 Video - Visual Size 1920 x 816
  
      AVC Info: 1 SPS - 1 PPS - Profile High @ Level 4.1
  
      NAL Unit length bits: 32
  
      Pixel Aspect Ratio 1:1 - Indicated track size 1920 x 816
  
  Self-synchronized
  
  
  
  Track # 2 Info - TrackID 2 - TimeScale 44100 - Duration 00:02:28.305
  
  Media Info: Language "English" - Type "soun:mp4a" - 6387 samples
  
  MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
  
  MPEG-4 Audio MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 44100
  
  Synchronized on stream 1
  
  Alternate Group ID 1

  I know I need to separate the video and audio and I think that’s where my issue is. The command I’m using probably isn’t doing the right thing.

  Is there a better command to demux my mp4 ?
  Is the MP4Box command I’m using best for segmenting the files ?
  If I use different files, will they always need to be demuxed ?

  One thing to mention, if I use the following commands everything works fine, but there is no audio because of the -an which means it’s only video :

  ffmpeg -i test.mp4 -c:v copy -g 72 -an output.mp4
  
  
  
  MP4Box -dash 4000 -frag 1000 -rap -segment-name segment_ output.mp4

  UPDATE

  I noticed that the video had no audio stream, but the audio had the video stream which is why I got the mux error. I thought that might be an issue so I ran this command to keep the unwanted streams out of the outputs :

  ffmpeg -i test.mp4 -c:v copy -g 72 -an video.mp4 -c:a copy -vn audio.mp4

  then I run :

  MP4Box -dash 4000 -frag 1000 -rap -segment-name segment_ video.mp4 audio.mp4

  now I no longer get the Multiplexed representations are intentionally not supported... message, but now I get :

  [122] Video Element Error: MEDIA_ERR_SRC_NOT_SUPPORTED 
  
  [123] [object MediaError] 
  
  [125] Schedule controller stopping for audio 
  
  [126] Caught pending play exception - continuing (NotSupportedError: Failed to load because no supported source was found.)

  I tried playing the video and audio independently through Chrome and they both work, just not through the dash player. Ugh, this is painful to learn, but I feel like I’m making progress.