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• FFMPEG .bat script not running :(

  1er octobre 2023, par divolo

  FFMPEG .bat script not running when I double click on the script file, It tries to open for a millisecond and then just disappears and my videos are in .MP4 format same as in the script.
Here is the script :

  


  FOR /F *tokens=*" %%G IN ('dir /b *.mp4') DO ffmpeg -i "%%G" -vf fade=in:0:d=5 -af afade=in:0:d=5 "%%~nG_1.mov"


  


  And this is the result I am getting when I paste script to the CMD in folder :

  


  *" %%G IN ('dir /b *.mp4') DO ffmpeg -i "%%G" -vf fade=in:0:d=5 -af afade=in:0:d=5 "%%~nG_1.mov" was unexpected at this time.


  


• What's the purpose of the END field in files containing metadata for ffmpeg ?

  15 juillet 2023, par rdrg109

  Table of contents

  


  

  • The context

  


  • Minimal working example

    

    • no. 1

    


    • no. 2

    


    • no. 3

    


    


  


  • The questions

  


  


  


  The context

  


  I'm aware that it is possible to insert metadata of chapters into a video using ffmpeg (link to documentation). Minimal working example no. 1 shows this point.

  


  When I insert chapters that are not consecutive, ffmpeg doesn't use the end time that is specified in the metadata file through the END field. "Minimal working example no. 2" shows this point. In "Minimal working example no. 3", the END field of all chapters is 1 millisecond, yet we get the same result of Minimal working example no. 2. What is worth noting is that the END of the last chapter is the only one that is added correctly.

  


  


  Minimal working example

  


  


  no. 1

  


  Consider the following ffmpeg metadata file. It creates chapters in the following time ranges

  


  

  • From 0 to millisecond 9999, the chapter is This is my chapter one

  


  • From 10000 to millisecond 19999, the chapter is This is my chapter two

  


  • From 20000 to millisecond 29999, the chapter is This is my chapter three

  


  • From 30000 to millisecond 39999, the chapter is This is my chapter four

  


  


  ;FFMETADATA1
title=The title of my video

[CHAPTER]
TIMEBASE=1/1000
START=0
END=10000
title=This is my chapter one

[CHAPTER]
TIMEBASE=1/1000
START=10000
END=20000
title=This is my chapter two

[CHAPTER]
TIMEBASE=1/1000
START=20000
END=30000
title=This is my chapter three


  


  The following command creates a simple video and inserts the metadata shown above into that video.

  


  ffmpeg -v error -y -f lavfi -i 'testsrc=d=120:size=100x100' -i metadata.txt -map_metadata 1 output.mp4


  


  The following command shows information about the metadata in the video file that was created by the previous command.

  


  ffprobe -v error -show_chapters -print_format json output.mp4 | jq


  


  {
  "chapters": [
    {
      "id": 0,
      "time_base": "1/1000",
      "start": 0,
      "start_time": "0.000000",
      "end": 10000,
      "end_time": "10.000000",
      "tags": {
        "title": "This is my chapter one"
      }
    },
    {
      "id": 1,
      "time_base": "1/1000",
      "start": 10000,
      "start_time": "10.000000",
      "end": 20000,
      "end_time": "20.000000",
      "tags": {
        "title": "This is my chapter two"
      }
    },
    {
      "id": 2,
      "time_base": "1/1000",
      "start": 20000,
      "start_time": "20.000000",
      "end": 30000,
      "end_time": "30.000000",
      "tags": {
        "title": "This is my chapter three"
      }
    }
  ]
}


  


  No problem until here.

  


  


  no. 2

  


  ;FFMETADATA1
title=The title of my video

[CHAPTER]
TIMEBASE=1/1000
START=0
END=5000
title=This is my chapter one

[CHAPTER]
TIMEBASE=1/1000
START=10000
END=15000
title=This is my chapter two

[CHAPTER]
TIMEBASE=1/1000
START=20000
END=25000
title=This is my chapter three


  


  The following command creates a simple video and inserts the metadata shown above into that video.

  


  ffmpeg -v error -y -f lavfi -i 'testsrc=d=120:size=100x100' -i metadata.txt -map_metadata 1 output.mp4


  


  The following command shows information about the metadata in the video file that was created by the previous command.

  


  ffprobe -v error -show_chapters -print_format json output.mp4 | jq


  


  {
  "chapters": [
    {
      "id": 0,
      "time_base": "1/1000",
      "start": 0,
      "start_time": "0.000000",
      "end": 10000,
      "end_time": "10.000000",
      "tags": {
        "title": "This is my chapter one"
      }
    },
    {
      "id": 1,
      "time_base": "1/1000",
      "start": 10000,
      "start_time": "10.000000",
      "end": 20000,
      "end_time": "20.000000",
      "tags": {
        "title": "This is my chapter two"
      }
    },
    {
      "id": 2,
      "time_base": "1/1000",
      "start": 20000,
      "start_time": "20.000000",
      "end": 25000,
      "end_time": "25.000000",
      "tags": {
        "title": "This is my chapter three"
      }
    }
  ]
}


  


  From the output above, we can notice the following :

  


  

  • The end time of the chapter with title This is my chapter one is 10000 which should be 15000, since that is the value we specified in the END field

  


  • The end time of the chapter with title This is my chapter two is 20000 which should be 25000, since that is the value we specified in the END field

  


  • The end time of the last chapter is the only one that is the same to the value that we wrote in the metadata file

  


  


  I consider this unexpected behavior because ffmpeg should use the end time that we have specified in the metadata file.

  


  


  no. 3

  


  ;FFMETADATA1
title=The title of my video

[CHAPTER]
TIMEBASE=1/1000
START=0
END=1
title=This is my chapter one

[CHAPTER]
TIMEBASE=1/1000
START=10000
END=10001
title=This is my chapter two

[CHAPTER]
TIMEBASE=1/1000
START=20000
END=20001
title=This is my chapter three


  


  The following command creates a simple video and inserts the metadata shown above into that video.

  


  ffmpeg -v error -y -f lavfi -i 'testsrc=d=120:size=100x100' -i metadata.txt -map_metadata 1 output.mp4


  


  The following command shows information about the metadata in the video file that was created by the previous command.

  


  ffprobe -v error -show_chapters -print_format json output.mp4 | jq


  


  {
  "chapters": [
    {
      "id": 0,
      "time_base": "1/1000",
      "start": 0,
      "start_time": "0.000000",
      "end": 10000,
      "end_time": "10.000000",
      "tags": {
        "title": "This is my chapter one"
      }
    },
    {
      "id": 1,
      "time_base": "1/1000",
      "start": 10000,
      "start_time": "10.000000",
      "end": 20000,
      "end_time": "20.000000",
      "tags": {
        "title": "This is my chapter two"
      }
    },
    {
      "id": 2,
      "time_base": "1/1000",
      "start": 20000,
      "start_time": "20.000000",
      "end": 20001,
      "end_time": "20.001000",
      "tags": {
        "title": "This is my chapter three"
      }
    }
  ]
}


  


  From the output above, we can notice the following :

  


  

  • The end time of the chapter with title This is my chapter one is 10000, but it should be 15000, since that is the value we specified in the END field in the metadata file

  


  • The end time of the chapter with title This is my chapter two is 20000, but it should be 25000, since that is the value we specified in the END field in the metadata file

  


  • The end time of the last chapter is the only one that is the same to the value that we wrote in the metadata file

  


  


  I consider this unexpected behavior because ffmpeg should use the end time that we have specified in the metadata file.

  


  


  The questions

  


  In minimal working example no. 2 and minimal working example no. 3, we could see that although the metadata file sets END for each chapter, a different time is used (except for the last chapter). My questions are :

  


  

  • What's the purpose of having a field called END when it only serves a purpose in the last chapter ?

  


  • Given that ffmpeg only adds the correct value for END for the last chapter ? Wouldn't a better name for END be END_ONLY_FOR_LAST_CHAPTER ?

  


  • Am I doing something wrong that is casuing ffmpeg to use a different value for END in all chapters but the last one ?

  


  


• ffmpeg copy a part of a video wrt to milliseconds accurately

  25 août 2016, par Santhosh Yedidi

  I am using ffmpeg to copy a part of video.

  I am using mpv to view the video. I get the start time and end time from it.

  ffmpeg -i "main.flv" -ss 01:54:34.340 -to 02:01:13.073 -c copy copied.mp4

  the problem i am facing is the video does not start from 01:54:34.340, it starts from 01:54:34.608

  so its shifting the start poistion.

  Is there any way i can start from the exact millisecond position or form that particular frame.

  or is there command to mention start frame number and end frame number. For that mpv also should tell me the frame numbers in ths OSD

  the output of the above command is

  Input #0, flv, from 'main.flv':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Custom
  
      creationdate    : Thu Aug 25 04:50:55 2016
  
                      : 
  
      videodevice     : VidBlaster
  
      avclevel        : 31
  
      avcprofile      : 77
  
      videokeyframe_frequency: 5
  
      audiodevice     : Realtek HD Audio Input
  
      audiochannels   : 2
  
      audioinputvolume: 100
  
    Duration: 03:55:58.86, start: 0.033000, bitrate: 855 kb/s
  
      Stream #0:0: Video: h264 (Main), yuv420p(tv), 640x480 [SAR 1:1 DAR 4:3], 819 kb/s, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
  
      Stream #0:1: Audio: aac (LC), 22050 Hz, stereo, fltp, 49 kb/s
  
  Output #0, mp4, to 'copied.mp4':
  
    Metadata:
  
      author          : 
  
      copyright       : 
  
      description     : 
  
      keywords        : 
  
      rating          : 
  
      title           : 
  
      presetname      : Custom
  
      creationdate    : Thu Aug 25 04:50:55 2016
  
                      : 
  
      videodevice     : VidBlaster
  
      avclevel        : 31
  
      avcprofile      : 77
  
      videokeyframe_frequency: 5
  
      audiodevice     : Realtek HD Audio Input
  
      audiochannels   : 2
  
      audioinputvolume: 100
  
      encoder         : Lavf57.25.100
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 819 kb/s, 30.30 fps, 29.97 tbr, 16k tbn, 1k tbc
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 22050 Hz, stereo, 49 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=  frame=    0 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=  frame=11906 fps=8002 q=-1.0 Lsize=   41574kB time=00:06:38.75 bitrate= 854.1kbits/s speed= 268x    
  
  video:38866kB audio:2336kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.904480%