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• FFMPEG errors with non-English characters

  1er avril 2021, par Mingli Yang

  When I tried to use the command-line to catch a chrome window with non-English characters such as ¥, or any other 中文页面, an I/O error will occur with the message "Can't find window "¥中文页面。 - Google Chrome", aborting." When the non-English characters are replaced by English ones, the errors will disappear. Environment : Windows 10, ffmpeg version 2021-03-24

  


  This works fine :
ffmpeg -f gdigrab -i title="$ English Page - Google Chrome" -pix_fmt yuv420p grab.mp4

  


  This has errors :
ffmpeg -f gdigrab -i title="¥中文页面。 - Google Chrome" -pix_fmt yuv420p grab.mp4

  


  "Can't find window "¥中文页面。 - Google Chrome", aborting."

  


  Any ideas to solve this ?

  


• avformat/matroskaenc : Don't write empty language

  16 février 2021, par Andreas Rheinhardt

  avformat/matroskaenc : Don't write empty language
  According to the new EBML specifications, a string element of length
  
  zero would be read as the default value by a compliant parser.
  Reviewed-by : Ridley Combs <rcombs@rcombs.me>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• FFMPEG : how to select audio stream without language metadata

  2 décembre 2020, par riofly

  I have some source Video files with one or more audio streams inside.
  
I would to encode each source file with Italian language. Then I can do it.

  


  ffmpeg -i source-file.avi -c:v ... -c:a ... -map 0:a:m:language:ita ...


  


  But some source file has audio stream without Language metadata.
  
I look that it is possible to set Language metadata with "und" special value. Then I try to select the audio stream with this command :

  


  ffmpeg -i source-file.avi -c:v ... -c:a ... -map 0:a:m:language:ita? -map 0:a:m:language:und? ...


  


  (the " ?" char say to ffmpeg that he do not fire exception if the audio stream do not exists).
  
Unfortunatelly this command do not works... It seems that ffmpeg search the "und" language instead of search a audio stream "without" language.

  


  Video MetaData

  


  This is the video MetaData where audio stream do not have language value :

  


  Input #0, matroska,webm, from 'D:\My-Video.mkv':
  Metadata:
    title           : My-Video
    encoder         : libebml v1.3.3 + libmatroska v1.4.4
    creation_time   : 2016-01-20T16:02:03.000000Z
  Duration: 01:15:28.93, start: 0.000000, bitrate: 2775 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
    Metadata:
      BPS             : 2387529
      BPS-eng         : 2387529
      DURATION        : 01:15:28.920000000
      DURATION-eng    : 01:15:28.920000000
      NUMBER_OF_FRAMES: 113223
      NUMBER_OF_FRAMES-eng: 113223
      NUMBER_OF_BYTES : 1351616420
      NUMBER_OF_BYTES-eng: 1351616420
      _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-20 16:02:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-20 16:02:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    Metadata:
      BPS             : 384000
      BPS-eng         : 384000
      DURATION        : 01:15:28.928000000
      DURATION-eng    : 01:15:28.928000000
      NUMBER_OF_FRAMES: 141529
      NUMBER_OF_FRAMES-eng: 141529
      NUMBER_OF_BYTES : 217388544
      NUMBER_OF_BYTES-eng: 217388544
      _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-20 16:02:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-20 16:02:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(ita): Subtitle: dvd_subtitle, 720x576 (default)
    Metadata:
      BPS             : 2218
      BPS-eng         : 2218
      DURATION        : 01:09:57.232000000
      DURATION-eng    : 01:09:57.232000000
      NUMBER_OF_FRAMES: 965
      NUMBER_OF_FRAMES-eng: 965
      NUMBER_OF_BYTES : 1163769
      NUMBER_OF_BYTES-eng: 1163769
      _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-20 16:02:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-20 16:02:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES


  


  Can someone help me ?
  
Thanks !