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• How to sync two videos of different length

  26 août 2020, par Huhngut

  I got two video files. The first one has good resolution but the wrong language and the second one has bad resolution but the wished language. Both of the files got a few seconds of black screen at the beginning but these seconds are different. I got a lot of these files and the intro seems to be always of a different length so I can't say always remove 2 seconds of audio and 3 seconds of video and then merge them.

  


  So I am wondering if there's some tool out there which s able to sync these files automatically.

  


  But it won't be enough to simply search for two identical images and calculate the time distance because the resolution is different (might its possible to scale the better one down for comparison) but even in this case, the program has to evaluate if the image has enough detail for comparison so it won't compare 2 black images. It would be good if the program scales the images to 50x50 to save time while comparing

  


  Does someone know any tool or has suggestions might even some python/java code for developing one. Any search suggestions or name ideas

  


• ffmpeg and ffplay for windows send CRLF inside double quote

  14 juin 2016, par uingtea

  I want to pass multiple headers for ffplay or ffmpeg, it say I need to split with CRLF. on linux I can use \ or $'\r\n' but how for windows ?

  SET CRLF=^
  
  ffplay -v debug -i "http://example.com/test" -headers "Accept-Language: en-US,en;q=0.5%CRLF%Connection: keep-alive"

  debug log : Connection: keep-alive is not sent

  [http @ 04df3f40] No trailing CRLF found in HTTP header.
  
  [http @ 04df3f40] request: GET /test HTTP/1.1 0KB sq=    0B f=0/0
  
  User-Agent: Lavf/57.37.101
  
  Accept: */*
  
  Range: bytes=0-
  
  Connection: close
  
  Host: example.com
  
  Icy-MetaData: 1
  
  Accept-Language: en-US,en;q=0.5

  thanks

• FFmpeg : Can't write metadata to a .ts file

  29 octobre 2019, par John Bergqvist

  I have an input that i’m muxing into a .ts file, however despite what FFmpeg’s wiki says (that it supports the title and language metadata keys) for MPEG transport streams), the title isn’t propagating to the video & audio :

  ffmpeg -i "source" \
  
  -map 0:0 -metadata:s:v:0 title="VIDEO_TITLE" \
  
  -map 0:1 -metadata:s:a:0 language="eng" -metadata:s:a:0 title="AUDIO_TITLE" \
  
  -c copy "output.ts"

  The language is, but not the title.

  This is what I get when actually muxing :

  Output #0, mpegts, to 'output.ts':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc (default)
  
      Metadata:
  
        variant_bitrate : 0
  
        title           : VIDEO_TITLE
  
      Stream #0:1(zxx): Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp
  
      Metadata:
  
        variant_bitrate : 0
  
        comment         : AUDIO_TITLE
  
        title           : AUDIO_TITLE

  However upon completion, it seems the title isn’t there. It doesn’t show up in mediainfo (or VLC for that matter) either :

  Input #0, mpegts, from 'output.ts':
  
    Duration: 01:00:00.00, start: 1.440000, bitrate: 5120 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x101](zxx): Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 68 kb/s

  If I was to run the same command but give the file an mp4 extension, the metadata is muxed in as expected, but not for a TS file - am I doing something wrong ?