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• Is there a way to batch split a file by chapter with ffmpeg and then reassemble with mkvmerge in windows ?

  13 avril, par Sipherdrakon

  So I made a batch script originally with the ability to relatively precision trim a video into chapters without having to run by keyframes, but the code looks horrible and I can't get it to loop through all mp4 files nor get mkvmerge to append the files after splitting them. Code is below but be gentle it is my first try.

  


  @echo off
setlocal enableDelayedExpansion

REM CODE BELOW CREATES JSON FILES FOR ALL MP4 FILES WITHIN THE SAME DIRECTORY
ffprobe -v quiet -print_format json -show_chapters -loglevel error "01x01.mp4" > "01x01.json"

REM CODE BELOW SETS VARIABLES FROM EACH SPECIFIC JSON
FOR /F "delims=" %%i in ('jq .chapters[2].start ^< 01x01.json') DO SET /A start1=%%i
FOR /F "delims=" %%j in ('jq .chapters[2].end ^< 01x01.json') DO SET /A end1=%%j

FOR /F "delims=" %%k in ('jq .chapters[4].start ^< 01x01.json') DO SET /A start2=%%k
FOR /F "delims=" %%l in ('jq .chapters[4].end ^< 01x01.json') DO SET /A end2=%%l

FOR /F "delims=" %%m in ('jq .chapters[6].start ^< 01x01.json') DO SET /A start3=%%m
FOR /F "delims=" %%n in ('jq .chapters[6].end ^< 01x01.json') DO SET /A end3=%%n

FOR /F "delims=" %%o in ('jq .chapters[8].start ^< 01x01.json') DO SET /A start4=%%o
FOR /F "delims=" %%p in ('jq .chapters[8].end ^< 01x01.json') DO SET /A end4=%%p

REM SETS THE DURATION OF EACH FILE TO USE PRECISION TIMING FOR START AND STOP TIMES
CALL vbs (%end1%-%start1%)/1000
SET duration1=%val%
CALL vbs (%end2%-%start2%)/1000
SET duration2=%val%
CALL vbs (%end3%-%start3%)/1000
SET duration3=%val%
CALL vbs (%end4%-%start4%)/1000
SET duration4=%val%

REM SETS THE START TIME IN SECONDS VS MILLISECONDS
CALL vbs (%start1%)/1000
SET start1=%val%
CALL vbs (%start2%)/1000
SET start2=%val%
CALL vbs (%start3%)/1000
SET start3=%val%
CALL vbs (%start4%)/1000
SET start4=%val%

REM TRIM AND SPLIT ORIGINAL FILE INTO SEPERATE SECTIONS BASED ON CHAPTER MARKERS
ffmpeg -ss %START1% -i 01x01.mp4 -ss 0 -c copy -to %DURATION1% -avoid_negative_ts make_zero 01x01-1.mp4
ffmpeg -ss %START2% -i 01x01.mp4 -ss 0 -c copy -to %DURATION2% -avoid_negative_ts make_zero 01x01-2.mp4
ffmpeg -ss %START3% -i 01x01.mp4 -ss 0 -c copy -to %DURATION3% -avoid_negative_ts make_zero 01x01-3.mp4
ffmpeg -ss %START4% -i 01x01.mp4 -ss 0 -c copy -to %DURATION4% -avoid_negative_ts make_zero 01x01-4.mp4

REM DELETES UNNEEDED JSON AFTER USE
del /s *.json

REM APPEND ALL MP4 FILES INTO COHESIVE MKV
for /d /r %%D in (*) do (
    pushd %%D
    set files=
    for %%F in (*.mp4) do set files=!files! + ^( "%%F" ^)
    if not "!files!"=="" %mkvmerge% -o "01x01-FINAL.mkv" !files:~2!
    popd
)

REM DELETE UNNEEDED MP4 ORIGINALS AND SPLIT FILES
del /s *.mp4


  


  I know it is super long and every time I try to use a variable or a loop to run through all files it can't read the json file. I've been at this all day and I can use the script as is but I have to make a file for each iteration.

  


  I was also hoping to be able to have it only pull chapters labeled as "video" but I haven't quite figured that one out yet.

  


  I'll add the vbs batch file for the arithmetic section as well as the sample json if it will help.

  


  @echo off
>"%temp%\VBS.vbs" echo Set fso = CreateObject("Scripting.FileSystemObject") : Wscript.echo (%*)
for /f "delims=" %%a in ('cscript /nologo "%temp%\VBS.vbs"') do set "val=%%a"
del "%temp%\VBS.vbs"


  


  {
    "chapters": [
        {
            "id": 0,
            "time_base": "1/1000",
            "start": 0,
            "start_time": "0.000000",
            "end": 5590,
            "end_time": "5.590000",
            "tags": {
                "title": "Video"
            }
        },
        {
            "id": 1,
            "time_base": "1/1000",
            "start": 5590,
            "start_time": "5.590000",
            "end": 13994,
            "end_time": "13.994000",
            "tags": {
                "title": "Advertisement"
            }
        },
        {
            "id": 2,
            "time_base": "1/1000",
            "start": 13994,
            "start_time": "13.994000",
            "end": 163964,
            "end_time": "163.964000",
            "tags": {
                "title": "Video"
            }
        },
        {
            "id": 3,
            "time_base": "1/1000",
            "start": 163964,
            "start_time": "163.964000",
            "end": 195940,
            "end_time": "195.940000",
            "tags": {
                "title": "Advertisement"
            }
        },
        {
            "id": 4,
            "time_base": "1/1000",
            "start": 195940,
            "start_time": "195.940000",
            "end": 547849,
            "end_time": "547.849000",
            "tags": {
                "title": "Video"
            }
        },
        {
            "id": 5,
            "time_base": "1/1000",
            "start": 547849,
            "start_time": "547.849000",
            "end": 595850,
            "end_time": "595.850000",
            "tags": {
                "title": "Advertisement"
            }
        },
        {
            "id": 6,
            "time_base": "1/1000",
            "start": 595850,
            "start_time": "595.850000",
            "end": 1413588,
            "end_time": "1413.588000",
            "tags": {
                "title": "Video"
            }
        },
        {
            "id": 7,
            "time_base": "1/1000",
            "start": 1413588,
            "start_time": "1413.588000",
            "end": 1477569,
            "end_time": "1477.569000",
            "tags": {
                "title": "Advertisement"
            }
        },
        {
            "id": 8,
            "time_base": "1/1000",
            "start": 1477569,
            "start_time": "1477.569000",
            "end": 1529696,
            "end_time": "1529.696000",
            "tags": {
                "title": "Video"
            }
        }
    ]
}


  


  I also tried using the start_time so I didn't have to do extra calculations but jq didn't like that either.

  


  mkvmerge doesn't even try to run when I have it in here and I still need to cut 7 seconds off the end and 12 seconds off the front of it once it is all one file again.

  


  Any help would be appreciated, I know it's a lot but I seem to have hit a roadblock or just sleep deprived at this point.

  


  UPDATE

  


  This works amazing I just need to figure out how to use files with spaces and I'm all set. I guess I could run a batch before hand replacing all spaces with underscores. That would probably work but I would like to not change filenames if I can help it.

  


  @echo off

for %%i in (*.mp4) do (
FOR /F "delims=" %%A IN ('ffprobe -v quiet -print_format json -show_chapters -loglevel error "%%i" ^| xidel - -se "$json/(chapters)()[id!=0 and tags/title='Video']/concat('ffmpeg -ss ',start div 1000,' -i %%i -to ',((end - start) div 1000),' -c copy -avoid_negative_ts make_zero %%~ni-',position(),'.mp4')"') DO %%A
FOR /F "delims=" %%A IN ('xidel -s --xquery "concat('mkvmerge -o "%%~ni-FINAL.mkv" "',join(file:list(.,false(),'%%~ni-*.mp4'),'" + "'),'"')"') DO %%A
)


  


• av_dump_format() : increase indentation for chapter metadata

  27 janvier 2021, par Anton Khirnov

  av_dump_format() : increase indentation for chapter metadata
  It should be at a deeper level than the chapter it belongs to.
  

  • [DH] libavformat/dump.c

• lavf/mov : improve `tref/chap` chapter handling

  8 janvier 2016, par Rodger Combs

  lavf/mov : improve `tref/chap` chapter handling
  3 parts :
  
   Supports multiple chapter streams
  
   Exports regular text chapter streams as opaque data. This prevents consumers
  
    from showing chapters as if they were regular subtitle streams.
  
   Exports video chapter streams as thumbnails, and provides the first one as
  
    an attached_pic.
  

  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c