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• Converting a spesific audio sream and copy the rest

  15 mai 2022, par Arete

  Is it possible to convert one of the audio tracks in a video file to a different format while copying/remuxing the other audio tracks in the file with FFmpeg ?

  


  More specifically, is it possible to do this without explicitly specify all the audio tracks you want to keep ?

  


  I have tried using the -map function,

  


  ffmpeg -i INPUT -c:v copy -c:a libfdk_aac -map 1:a:2 OUTPUT.mkv


  


  but this only encodes the first audio track and excludes the rest. I know I can probably explicitly tell FFmpeg to mux all the rest of the audio tracks, but this is really tedious. It means I will have to count every audio track and write e considerably longer command.

  


  Is there not a way to tell FFmpeg "convert audio track X and copy the rest" ?

  


  Here is the MediaInfo of the file. Note that there are over 10 audio tracks but I have excluded them in this example to keep it simple.

  


  Video
ID                                       : 4113 (0x1011)
Menu ID                                  : 1 (0x1)
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : 36
Duration                                 : 2 h 30 min
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0050 cd/m2, max: 4000 cd/m2
Maximum Content Light Level              : 349 cd/m2
Maximum Frame-Average Light Level        : 86 cd/m2

Audio #1
ID                                       : 4352 (0x1100)
Menu ID                                  : 1 (0x1)
Format                                   : DTS XLL
Format/Info                              : Digital Theater Systems
Commercial name                          : DTS-HD Master Audio
Muxing mode                              : Stream extension
Codec ID                                 : 134
Duration                                 : 2 h 30 min
Bit rate mode                            : Variable
Channel(s)                               : 6 channels
Channel layout                           : C L R Ls Rs LFE
Sampling rate                            : 48.0 kHz
Frame rate                               : 93.750 FPS (512 SPF)
Bit depth                                : 24 bits
Compression mode                         : Lossless

Audio #2
ID                                       : 4353 (0x1101)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 30 min
Bit rate mode                            : Constant
Bit rate                                 : 640 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Delay relative to video                  : -9 ms
Stream size                              : 687 MiB (1%)
Service kind                             : Complete Main

Audio #3
ID                                       : 4354 (0x1102)
Menu ID                                  : 1 (0x1)
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Commercial name                          : Dolby Digital
Codec ID                                 : 129
Duration                                 : 2 h 30 min
Bit rate mode                            : Constant
Bit rate                                 : 448 kb/s
Channel(s)                               : 6 channels
Channel layout                           : L R C LFE Ls Rs
Sampling rate                            : 48.0 kHz
Frame rate                               : 31.250 FPS (1536 SPF)
Bit depth                                : 16 bits
Compression mode                         : Lossy
Delay relative to video                  : -9 ms
Stream size                              : 481 MiB (1%)
Service kind                             : Complete Main


  


• How can I use FFMPEG to extract a specific color from a video and put it over alpha ?

  28 février 2024, par Michael Macha

  I have a rendered animation which looks great, but my original file was not saved properly and has lost some of the data. I can quickly get that data back, if I can extract a specific color from the rendered video to a new file or image sequence, over either a key color or preferably transparency.

  


  Since I'm hand animating this, it's important that I automate as much as possible. I think FFMPEG could come to the rescue here and help me retrieve that data.

  


  My current line is this :

  


  ffmpeg -i ./"Light Bleeder Twirl Above.mp4" -vf "colorkey=0xe1eff9:0.1:0.1,format=rgba" -c:a copy ./out%04d.png


  


  Here, E1EFF9 is the color I'm after. It successfully extracts the handful of frames to PNG files, but it copies all of the data, not just E1EFF9.

  


  I'm not sure why colorkey isn't doing what I want it to. If someone could provide some insight, it would be much appreciated.

  


  Addendum : So, my idea worked in principle ; I did a chroma key with Kdenlive and color-to-alpha'd the black to transparency after a manual rescale. It isn't exactly the same, but it's very close and saves a lot of time. I still feel like it should most certainly have worked with FFMPEG, much faster, and would still like to know what was wrong with my script.

  


• How to force "full range" flag on export

  28 janvier 2019, par Emanuele Vissani

  I have an ffmpeg command to remap audio tracks to descrete channels in a ProRes 4444 quicktime file. Even if the input video is copied to the output, the exported file is interpreted by a professional video player software as video range (16-234 values) instead of the original full range (0-255 values), making it look more contrasted.
  The content is actually correct, changing manually the range setting in the player software gives back the right light range, so I think the output file just lose some kind of range flag.

  I already tried the following options without results :

  -colorspace bt709 -movflags +write_colr

  -dst_range 1 -color_range 2

  -vf scale=out_range=full

  -vf scale=in_range=full:out_range=full

  Original command is :

  ffmpeg -i F:\_IMPORT\TST_ProRes4444_4k.mov -map 0:0 -c copy -map 0:1 -c copy -map_channel 0.2.0:0.2 -c:a pcm_s24le F:\_EXPORT\TEST\test.mov

  Thank you for your help.