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• How to specify streams by pid with ffmpeg, If the value of pid is duplicated ?

  22 novembre 2019, par Bo Wang

  I have a nice m2ts file and I would like to demux specific audio streams from it. Of important, this specification is needed to use PID as identifier.
  The exemplified m2ts file has 7 audio streams, which is detected by eac3to and shown below

  eac3to.exe F:\xxx 1)
  
  M2TS, 1 video track, 7 audio tracks, 5 subtitle tracks, 1:40:03
  
  1: Chapters, 34 chapters
  
  2: h265/HEVC, 2160p24 /1.001 (16:9), 10 bits
  
  3: TrueHD/AC3 (Atmos), English, 7.1 channels, 48kHz, dialnorm: -28dB
  
     (embedded: AC3, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB)
  
  4: E-AC3, English, 7.1 channels, 1024kbps, 48kHz, dialnorm: -28dB
  
     (core: AC3, 5.1 channels, 576kbps, 48kHz, dialnorm: -28dB)
  
  5: AC3, English, 5.1 channels, 640kbps, 48kHz, dialnorm: -27dB
  
  6: AC3, English, 2.0 channels, 320kbps, 48kHz, dialnorm: -27dB
  
  7: AC3, English, 2.0 channels, 320kbps, 48kHz, dialnorm: -27dB
  
  8: AC3, Chinese, 2.0 channels, 448kbps, 48kHz
  
  9: AC3, Chinese, 5.1 channels, 384kbps, 48kHz, 300ms
  
  10: Subtitle (PGS), English
  
  11: Subtitle (PGS), Chinese
  
  12: Subtitle (PGS), Chinese
  
  13: Subtitle (PGS), Chinese
  
  14: Subtitle (PGS), Chinese

  However, if I run
  ffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts", ffmpeg shows an additional audio stream as it recognizes the embedded 5.1 AC3 stream inside the 7.1 TrueHD audio stream, as independent :

  Input #0, mpegts, from 'F:\xxx\BDMV\STREAM\00055.m2ts':
  
    Duration: 00:00:48.62, start: 4198.333333, bitrate: 50005 kb/s
  
    Program 1
  
      Stream #0:0[0x1011]: Video: hevc (Main 10) (HDMV / 0x564D4448), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 23.98 tbc
  
      Stream #0:1[0x1100]: Audio: truehd (AC-3 / 0x332D4341), 48000 Hz, 7.1, s32 (24 bit)
  
      Stream #0:2[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
  
      Stream #0:3[0x1101]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1024 kb/s
  
      Stream #0:4[0x1102]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
  
      Stream #0:5[0x1103]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
  
      Stream #0:6[0x1104]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
  
      Stream #0:7[0x1105]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 448 kb/s
  
      Stream #0:8[0x1106]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:9[0x12a0]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:10[0x12a1]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:11[0x12a2]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:12[0x12a3]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:13[0x12a4]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)

  It can be found that the Stream #0:1 and Stream #0:2 have the same PID 0x1100. And ffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts" -map i:0x1100 -c copy 00055-0x1100.thd will yield error :

  [truehd @ 0000021ae9517600] truehd files have exactly one stream
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
    Stream #0:2 -> #0:1 (copy)
  
      Last message repeated 1 times

  By contrast, it works by giving other pids without duplication, such as ffmpeg.exe -hide_banner -i "F:\xxx\BDMV\STREAM\00055.m2ts" -map i:0x1101 -c copy 00055-0x1101.eac3 :

  Input #0, mpegts, from 'F:\xxx\BDMV\STREAM\00055.m2ts':
  
    Duration: 00:00:48.62, start: 4198.333333, bitrate: 50005 kb/s
  
    Program 1
  
      Stream #0:0[0x1011]: Video: hevc (Main 10) (HDMV / 0x564D4448), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 23.98 tbc
  
      Stream #0:1[0x1100]: Audio: truehd (AC-3 / 0x332D4341), 48000 Hz, 7.1, s32 (24 bit)
  
      Stream #0:2[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
  
      Stream #0:3[0x1101]: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1024 kb/s
  
      Stream #0:4[0x1102]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s
  
      Stream #0:5[0x1103]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
  
      Stream #0:6[0x1104]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 320 kb/s
  
      Stream #0:7[0x1105]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 448 kb/s
  
      Stream #0:8[0x1106]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:9[0x12a0]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:10[0x12a1]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:11[0x12a2]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:12[0x12a3]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
      Stream #0:13[0x12a4]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090)
  
  Output #0, eac3, to '00055-0x1101.eac3':
  
    Metadata:
  
      encoder         : Lavf58.34.101
  
      Stream #0:0: Audio: eac3 (AC-3 / 0x332D4341), 48000 Hz, 7.1, fltp, 1024 kb/s
  
  Stream mapping:
  
    Stream #0:3 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  size=    6076kB time=00:00:48.57 bitrate=1024.7kbits/s speed=92.6x
  
  video:0kB audio:6076kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

  In this case, how can I specify the streams by PID ?

• avcodec/vc2enc : Simplify writing dirac golomb codes

  8 mars, par Andreas Rheinhardt

  avcodec/vc2enc : Simplify writing dirac golomb codes
  The earlier code used a loop to determine the number of bits used
  
  and called ff_log2() on a power of two (and it would be easy to
  
  keep track of the exponent of said power-of-two) ; neither GCC nor
  
  Clang optimized the loop away or avoided the ff_log2().
  
  This patch replaces the loop and the log2 with a single av_log2().
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/vc2enc.c

• How can I simply replace the colors using the color masks on this image and then save it ? With RGBA channels as example

  31 août 2020, par karl-police

  So I got this GIF here :

  


  

  


  As you can see, it has Red, Green and Blue in it. And it also has a full transparency in it. This was composed together with FFMPEG out of images that looked exactly like that.

  


   

  


  Then, with FFMPEG I "decomposed" the RGB and Alpha channels using the filter "extractplanes".

  


  The gallery of that, in correct order starting from up to down, can be found here :

  


  https://imgur.com/a/WN0aGuW

  


  I am not sure if this actually helps me or if I'm supposed to decompose them. Because apperantly now, after decomposing them, I'm supposed to modify them, but I'm not really sure how. It's like how do I modify the red channel that only has black and white, so all at the end, will match to the specified HEX color that I want it to be to.

  


   

  


  Now, my question is. How do I exactly make the color changing happen ? Can I do this simply with JavaScript ? Is it possible to do with FFMPEG, if possible without ImageMagicks ? Maybe a programming language where not much installation is needed to do that ?

  


  What I understood is that. These channels basically contain values from 0 to 255 with black and white. I think the "brightness" is that what 0 and 255. So something inbetween, would be like grey.

  


  So basically, like we do (255,0,0) for red. In these channels, if I want red somewhere I need to put one fully white pixel on the red channel and on all the other channels, there has to be a fully black pixel.

  


  That's the concept. Now is the question, how can I do this ?

  


   

  


  At the end I want to make it look like the colors this one has, as example :

  


  

  


  This is from a game. So basically that's how it looks like in the game. And the game files only use these RGBA template sprites.

  


   

  


  I asked a similar question here : How to change colors of an image using RGBA and more channels independently of their color

  


  But somehow, I might didn't seem to explain it that well.

  


   

  


  I made a thing here to test around with things. I guess that's nearly close, but the lines are kinda weird. jsfiddle.net/qsgazubk