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• avcodec : add constants for KLV pseudo-profile.

  27 mai 2020, par Brad Hards

  avcodec : add constants for KLV pseudo-profile.
  There are two different ways KLV is used in MISB specs - sync and async.
  
  The corresponding text (in ST1401) says :
  ISO/IEC 13818-1 Table-34 defines a stream_type = 0x15 for “Metadata carried in PES packets,”
  
  and Table 2-22 defines a stream_id = 0xFC for “metadata stream.”
  and
  In ISO/IEC 13818-1, Table-34 defines a stream_type = 0x06 for “PES packets containing private
  
  data,” and Table 2-22 defines a stream_id = 0xBD for “private_stream_1.”
  These constants allow us to distinguish the two cases, as codec profiles.
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] libavcodec/avcodec.h

• Working with -filter_complex in ffmpeg with a batch concat array

  21 avril 2014, par user3555008

  What I am trying to do here is write an ffmpeg script that takes all songs from a folder and combines them into one audio file using the command line in Windows.

  So far I have

  ffmpeg -i "pathforinput1" -i "pathforinput2" -i "pathforinputn" -filter_complex "[0:0] [1:0] concat=n=(number of songs goes here):v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "output file.mp3"

  My problem is that I want to combine it with the existing script :

  for %A in ("input folder\*.extension") do ffmpeg

  to create a total script that uses -i "%A" for the input. The problem I am having here is that each input file requires an entry in the array -filter_complex "[0:0] [1:0] as well as having the total number of input files present in concat=n=(number of files). I’ m willing to use a batch script to make this possible, but I can’t see how I would go about finding the total number of files in a folder and then creating an array for each (for example if there were 7 songs the array would be [0:0] [1:0] [2:0] [3:0] [4:0] [5:0] [6:0]).

  Any help or pointers for making this possible would be great. Someone in this question managed to make something similar for a Unix system but I am using batch files and I don’t know how to modify it for Windows.

  Thanks in advance for any help

  Ok, progress made with the help of the first commenter. However, I think ffmpeg isn’t liking what I’ve made. My code thus far is :

  :: Give you a list of the .wav filenames in -i "filename1" -i "filename2" format
  
  
  
  for %%a in ("C:\Users\James\Input\*.*") do call set var=%%var%% -i "%%a"
  
  echo %var%
  
  
  
  :: Give you the number of .mp3 files
  
  
  
  for /f %%a in ('dir "C:\Users\James\Input\*.*" /b /a-d ^|find /c /v "" ') do set "numfiles=%%a"
  
  echo there are "%numfiles%" files
  
  set /a totalnum=numfiles
  
  
  
  :: dir "C:\Users\James\Input\" /b >> C:\Users\James\Output\filelist.txt
  
  :: print some text
  
  set /a numfiles=numfiles-1
  
  for /L %%b in (0,1,%numfiles%) do call set array=%%array%% [%%b:0]
  
  :: for /L %%b in (0,1,%numfiles%) do call set array=%%array%% [0:0]
  
  echo %array%
  
  for /f "tokens=* delims= " %%C in ('echo %array% ') do set array=%%C
  
  set array=%array:~0,-1%
  
  echo %array%
  
  :: for %%d in ("C:\Users\James\Input\*.*") do ffmpeg -i "%%d" -filter_complex "%array% concat=n=%totalnum%:v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "C:\Users\James\Output\outputtestbatch1.mp3"
  
  for %%d in ("C:\Users\James\Input\*.*") do ffmpeg -i "%%d" -filter_complex "%array% concat=n=%totalnum%:v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "C:\Users\James\Output\outputtestbatch1.mp3"
  
  pause`

  The issue I am having now is that I think ffmpeg is assuming each input file has audio stream [0:0] rather than incrementing them one after the other. Is there a way to fix this with the input method I’m using ?

  **SECOND EDIT**L : Success ! I modified foxidrive’s script a bit because it was slightly misconfigured. Final product is here :

  @echo off
  
  
  
  for %%a in ("C:\Users\James\Input\*.*") do call set var=%%var%% -i "%%a"
  
  :: echo %var%
  
  :: Give you the number of files
  
  
  
  for /f %%a in ('dir "C:\Users\James\Input\*.*" /b /a-d ^|find /c /v "" ') do set "numfiles=%%a"
  
  echo there are "%numfiles%" files
  
  
  
  for /L %%b in (0,%numfiles%) do call set array=%%array%% [%%b:0]
  
  set array=%array:~1%
  
  echo "%array%"
  
  
  
  ffmpeg %var% -filter_complex "%array% concat=n=%numfiles%:v=0:a=1 "[a]"" -map "[a]" -acodec libmp3lame -ab 320k "C:\Users\James\Output\outputtestbatch1.mp3"
  
  
  
  popd    
  
  pause

• Diamond Rio Artifacts

  30 août 2012, par Multimedia Mike — Multimedia History

  Remember the Diamond Rio PMP300 ? It’s credited with being the very first portable MP3 player, released all the way back in 1998 (I say ‘credited’ because I visited an audio museum once which exhibited a Toshiba MP3 player from 1997). I recently rescued a pristine set of Rio artifacts from a recycle pile.

  
  
  

  I wondered if I should scan the manual for posterity. However, a Google search indicates that a proper PDF (loaded with pleas to not illegally copy music) isn’t very difficult to come by. Here are the other items that came with the unit :

  
  
  Click for larger image
  

  Ah, more memories (of dialup internet) : A tie-in with another Diamond product, this time a modem which claims to enable the user to download songs at up to 112 kilobits per second. I wonder if that was really possible. I remember that 56k modems were a stretch and 33.6k was the best that most users could hope for.

  There is also a separate piece of paper that advises the buyer that the parallel port adapter might look a bit different than what is seen in the printed copy. Imagine the age of downloading to your MP3 player via parallel port while pulling down new songs via dialup internet.

  The artifacts also included not one, but two CD-ROMs :

  
  
  Click for larger image
  

  One is a driver and software disc, so no big surprise there. The other has a selection of MP3 files for your shiny new MP3 player. I’m wondering if these should be proactively preserved. I was going to process the files’ metadata and publish it here, for the benefit of search engines. However, while metadata is present, the files don’t conform to any metadata format that FFmpeg/Libav recognize. The files mention Brava Software Inc. in their metadata sections. Still, individual filenames at the end of this post.

  Leftovers :
  A few other miscellaneous multimedia acquisitions :

  
  
  

  I still want to study all of these old multimedia creation programs in depth some day. Theatrix Hollywood is a creative writing game, Wikipedia alleges (I’m a bit rigid with my exact definition of what constitutes a game). Here is an example movie output from this software. Meanwhile, the Mad Dog Multimedia CD-ROM apparently came packaged with a 56X CD-ROM drive (roughly the pinnacle of CD-ROM speeds). I found it has some version of Sonic Foundry’s ACID software, thus making good on the “applications” claim on the CD-ROM copy.

  Diamond Rio MP3 Sampler
  These are the names of the MP3 files found on the Diamond Rio MP3 sampler for the benefit of search engines.

  13_days.mp3
  albert_einstein_dreams.mp3
  a_man_of_many_colours.mp3
  anything_for_love.mp3
  a_secret_place.mp3
  bake_sale.mp3
  bigger_than_the_both_of_us.mp3
  boogie_beat.mp3
  bring_it_on.mp3
  buskersoundcheck_hippo.mp3
  charm.mp3
  chemical_disturbance.mp3
  coastin.mp3
  credit_is_due.mp3
  dance_again.mp3
  destiny.mp3
  dig_a_little_deeper.mp3
  diplomat6_bigmouthshut.mp3
  dirty_littlemonster.mp3
  dirty.mp3
  drivin.mp3
  Eric_Clapton_Last_Train.mp3
  etude_in_c_sharp_minor_op_42_n.mp3
  everybody_here.mp3
  freedom_4_all.mp3
  grandpas_advice.mp3
  groove.mp3
  heartland.mp3
  he_loved_her_so.mp3
  highway_to_hell.mp3
  hit_the_ground_runnin.mp3
  i_feel_fine_today.mp3
  im_not_lost_im_exploring.mp3
  into_the_void.mp3
  its_alright.mp3
  i_will_be_there.mp3
  i_will_pass_this_way_again.mp3
  juiceboxwilly_hepcat.mp3
  just_an_illusion.mp3
  keepin_time_by_the_river.mp3
  king_of_the_brooklyn_delta.mp3
  lovermilou_ringingbell.mp3
  middle_aged_rock_and_rollers.mp3
  midnight_high.mp3
  mr_schwinn.mp3
  my_brilliant_masterpiece.mp3
  my_gallery.mp3
  on_the_river_road.mp3
  pouring_rain.mp3
  prayer.mp3
  rats_in_my_bedroom.mp3
  razor_serpent_and_the_dub_mix.mp3
  ruthbuzzy_pleasestophangin.mp3
  secret_love.mp3
  ships.mp3
  silence_the_thunder.mp3
  sleeping_beauty.mp3
  slow_burn.mp3
  standing_in_my_own_way.mp3
  take_no_prisoners.mp3
  takin_up_space.mp3
  Taylor_Dayne_Unstoppable.mp3
  the_laundromat_song.mp3
  the_old_dun_cow.mp3
  the_people_i_meet.mp3
  trip_trigger_avenue.mp3
  tru-luv.mp3
  unfortunate_man.mp3
  vertigo.mp3
  when_she_runs.mp3
  where_do_we_go_from_here.mp3
  words_of_earnest.mp3