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• FFMPEG encode audio and forced subtitles at same time ?

  8 janvier 2017, par Nick Bell

  I’m using latest static build of ffmpeg windows.

  My input file (.mkv) is :

  [video] - 1080, V_MPEG4/ISO/AVC, 14.6 Mbps, ID#0
  
  [audio] - DTS 5.1, 1510 Kbps, ID#1
  
  [subtitles] - S_TEXT/ASS Lossless English, ID#14

  My problem is this : I convert the audio, so that my target player, a XB1 console (media support faq), is able to play audio/video. However sometimes its rather difficult to hear or parts may be in foreign language, so I want to force the english subtitles into the mix at the same time I convert the audio.

  Currently for the audio, I use the following command

  ffmpeg -i input.mkv -codec copy -acodec ac3 output.mkv

  Can I somehow tie in the forced subtitles (onto the video) in order to save an extra process of taking the output.mkv and trying to force subtitles on ?

  Edit : I’ve tried using the following command to extract subtitles to be able to edit them

  ffmpeg -i Movie.mkv -map 0:s:14 subs.srt

  However i get the error : Stream map '0:s:14' matches no streams

  Edit2 : attempted to extract subtitles and succeeded with

  ffmpeg -i input.mkv -map 0:14 -c copy subtitles.ass

  but still looking to force the subtitles, nonetheless !

  Also - a little bonus to this question - can I somehow extract the .ass file and edit it to only produce subtitles for foreign parts - so english audio doesn’t have subtitles during the movie but foreign audio does have subtitles ?

  Cheers

  Edit3 :

  When I try to use both of the commands at once (my earlier mentioned audio converter & one from the ffmpeg wiki)

  ffmpeg -i input.mkv -codec copy -acodec ac3 -vf "ass=subs.ass" output.mkv

  I get the following error from ffmpeg,

  Filtergraph 'ass=subs.ass' was defined for video output stream 0:0 but codec copy was selected.
  
  Filtering and streamcopy cannot be used together.

• FFMPEG doesn't convert from m4v files

  8 février 2014, par MattD

  I am trying to transcode an m4v file from iTunes so I can play it on Windows or XBox. I am running ffmpeg from Windows. Is there some -vcodec I need to specify or something I need to install ? Here's the command I'm running and the error I'm getting.

  Edit : Complete output

  ffmpeg version N-60393-g9707b53 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Feb  6 2014 22:07:13 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 63.101 / 52. 63.101
  
    libavcodec     55. 49.101 / 55. 49.101
  
    libavformat    55. 30.100 / 55. 30.100
  
    libavdevice    55.  7.100 / 55.  7.100
  
    libavfilter     4.  1.102 /  4.  1.102
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] stream 0, timescale not set
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Stream #3: not enough frames to estimate rate; consider increasing probesize
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Stream #4: not enough frames to estimate rate; consider increasing probesize
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 1 (Video: none (drmi / 0x696D7264), 960x718, 3957 kb/s): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 2 (Audio: none (drms / 0x736D7264), 48000 Hz, 5.1(side), 384 kb/s): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000268f620] Could not find codec parameters for stream 3 (Subtitle: none (p608 / 0x38303670), 1280x718, 0 kb/s): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Y:02 The Empty Hearse (HD).m4v':
  
    Metadata:
  
      major_brand     : M4V 
  
      minor_version   : 0
  
      compatible_brands: M4V mp42isom
  
      creation_time   : 2014-01-13 18:51:33
  
      title           : [...]
  
      artist          : [...]
  
      album           : [...]
  
      genre           : Drama
  
      track           : 2/8
  
      disc            : 1/1
  
      date            : 2014-01-19T08:00:00Z
  
      description     : [...]
  
      hd_video        : 1
  
      network         : PBS
  
      show            : Sherlock
  
      episode_id      : 1
  
      season_number   : 3
  
      episode_sort    : 2
  
      media_type      : 10
  
      synopsis        : [...]
  
    Duration: 01:26:28.70, start: 0.000000, bitrate: 4505 kb/s
  
      Stream #0:0(eng): Audio: aac (drms / 0x736D7264), 48000 Hz, stereo, fltp, 156 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-13 18:51:33
  
        handler_name    : Apple Sound Media Handler
  
      Stream #0:1(eng): Video: none (drmi / 0x696D7264), 960x718, 3957 kb/s, SAR 4:3 DAR 640:359, 25 fps, 25 tbr, 2500 tbn, 2500 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-01-13 18:51:33
  
        handler_name    : Apple Video Media Handler
  
      Stream #0:2(eng): Audio: none (drms / 0x736D7264), 48000 Hz, 5.1(side), 384 kb/s
  
      Metadata:
  
        creation_time   : 2014-01-13 18:51:33
  
        handler_name    : Apple Sound Media Handler
  
      Stream #0:3(eng): Subtitle: none (p608 / 0x38303670), 1280x718, 0 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-01-13 18:51:33
  
        handler_name    : Apple Closed Caption Media Handler
  
      Stream #0:4: Video: mjpeg, yuvj444p(pc), 640x640 [SAR 300:300 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
  
  File 'Sherlock.wmv' already exists. Overwrite ? [y/N] [buffer @ 0000000005fc5760] Unable to parse option value "-1" as pixel format
  
      Last message repeated 1 times
  
  [buffer @ 0000000005fc5760] Error setting option pix_fmt to value -1.
  
  [graph 0 input from stream 0:1 @ 00000000027d7da0] Error applying options to the filter.
  
  Error opening filters!

• Survey of CD Image Formats

  30 avril 2013, par Multimedia Mike — General

  In the course of exploring and analyzing the impressive library of CD images curated at the Internet Archive’s Shareware CD collection, one encounters a wealth of methods for copying a complete CD image onto other media for transport. In researching the formats, I have found that many of them are native to various binary, proprietary CD programs that operate under Windows. Since I have an interest in interpreting these image formats and I would also like to do so outside of Windows, I thought to conduct a survey to determine if enough information exists to write processing tools of my own.

  Remember from my Grand Unified Theory of Compact Disc that CDs, from a high enough level of software abstraction, are just strings of 2352-byte sectors broken up into tracks. The difference among various types of CDs comes down to the specific meaning of these 2352 bytes.

  Most imaging formats rip these strings of sectors into a giant file and then record some metadata information about the tracks and sectors.

  ISO
  This is perhaps the most common method for storing CD images. It’s generally only applicable to data CD-ROMs. File images generally end with a .iso extension. This refers to ISO-9660 which is the standard CD filesystem.

  Sometimes, disc images ripped from other types of discs (like Xbox/360 or GameCube discs) bear the extension .iso, which is a bit of a misnomer since they aren’t formatted using the ISO-9660 filesystem. But the extension sort of stuck.

  BIN / CUE
  I see the BIN & CUE file format combination quite frequently. Reportedly, a program named CDRWIN deployed this format first. This format can handle a mixed mode CD (e.g., starts with a data track and is followed by a series of audio tracks), whereas ISO can only handle the data track. The BIN file contains the raw data while the CUE file is a text file that defines how the BIN file is formatted (how many bytes in a sector, how many sectors to each individual track).

  CDI
  This originates from a program called DiscJuggler. This is extremely prevalent in the Sega Dreamcast hobbyist community for some reason. I studied the raw hex dumps of some sample CDI files but there was no obvious data (mostly 0s). There is an open source utility called cdi2iso which is able to extract an ISO image from a CDI file. The program’s source clued me in that the metadata is actually sitting at the end of the image file. This makes sense when you consider how a ripping program needs to operate– copy tracks, sector by sector, and then do something with the metadata after the fact. Options include : 1) Write metadata at the end of the file (as seen here) ; 2) write metadata into a separate file (seen in other formats on this list) ; 3) write the data at the beginning of the file which would require a full rewrite of the entire (usually large) image file (I haven’t seen this yet).

  Anyway, I believe I have enough information to write a program that can interpret a CDI file. The reason this format is favored for Dreamcast disc images is likely due to the extreme weirdness of Dreamcast discs (it’s complicated, but eventually fits into my Grand Unified Theory of CDs, if you look at it from a high level).

  MDF / MDS
  MDF and MDS pairs come from a program called Alcohol 120%. The MDF file has the data while the MDS file contains the metadata. The metadata is in an opaque binary format, though. Thankfully, the Wikipedia page links to a description of the format. That’s another image format down.

  CCD / SUB / IMG
  The CloneCD Control File is one I just ran across today thanks to a new image posted at the IA Shareware Archive (see Super Duke Volume 2). I haven’t found any definitive documentation on this, but it also doesn’t seen too complicated. The .ccd file is a text file that is pretty self-explanatory. The sample linked above, however, only has a .ccd file and a .sub file. I’m led to believe that the .sub file contains subchannel information while a .img file is supposed to contain the binary data. So this rip might be incomplete (nope, the .img file is on the page, in the sidebar ; thanks to Phil in the comments for pointing this out). The .sub file is a bit short compared to the Archive’s description of the disc’s contents (only about 4.6 MB of data) and when I briefly scrolled through, it didn’t look like it contains any real computer data. So it probably is just the disc’s subchannel data (something I glossed over in my Grand Unified Theory).

  CSO
  I have dealt with the CISO (compressed ISO) format before. It’s basically the same as a .iso file described above except that each individual 2048-byte data sector is compressed using zlib. The format boasts up to 9 compression levels, which shouldn’t be a big surprise since that correlates to zlib’s own compression tiers.

  Others
  Wikipedia has a category for optical disc image formats. Of course, there are numerous others. However, I haven’t encountered them in the wild for the purpose of broad image distribution.