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• Re-encoding vlc-created mpeg2 .ts file results in 20 second file ; AKA : multi-stream file with hidden streams

  23 novembre 2016, par insaner

  I was recording something with vlc off v4l2 (in case that makes a difference), and I just selected the first format that worked, being mpeg2 using TS container. File resulted in .ts extension, as automatically selected by vlc. When I then tried to put the video file in my video editor, it said the video was 19,884 hours long, when it should be about 6 minutes (it is 80mb in size). When I try to play it in xine, it correctly shows the duration (vlc doesn’t), and when I use ffprobe :

  [mpegts @ 0x9b2c0a0] max_analyze_duration 5000000 reached at 5000000
  
  Input #0, mpegts, from 'loopbacktestcap.ts':   Duration: N/A, start:
  
  17978.139456, bitrate: N/A   Program 1 
  
       Stream #0:0[0x44](): Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 104857 kb/s, 30 fps, 30
  
  tbr, 90k tbn, 60 tbc
  
       Stream #0:1[0x46](): Video: mpeg2video ([2][0][0][0] / 0x0002), 90k tbn

  Notice especially this line :

     Duration: N/A, start: 17978.139456, bitrate: N/A   Program 1 

  I looked it up and it seems the lack of duration has to do with the container. But I have tried a few things to reencode (I tried -vcodec copy, mpeg2, libx264...) and all I can get is 20 second files of 1.1mb - 1.8mb.

  So how can I reencode this file so the duration appears, and I get the full 6 minutes, instead of just the first 20 seconds ?

• Batch file to add separate audio file to MP4 file [closed]

  30 janvier 2021, par MrRoso

  I have a couple of video files (MP4) with audio in France.
Video1.mp4, Video2.mp4, Video3.mp4, ……
In the same directory, I have the same couple of audio files in English (m4a).
Audio1.m4a, Audio2.m4a, Audio3.m4a, ……

  


  The command

  


  ffmpeg -i "Video1.mp4" -i "Audio1m4a" -map 0 -map 1:a -c copy "Out.mp4"


  


  to add the audio file to the Video file works fine, but I need to do this for each video and audio file manually.

  


  I want to do this in a batch file, like this :

  


  @Echo off
for %%i in (*.MP4) %%j in (*.m4a) do ffmpeg -i "%%i" -i "%%j" -map 0 -map 1:a -codec copy "/new/%%~nI.mp4"


  


  But I get the follow error message :
"% j" cannot be processed syntactically at this point.

  


  Also the new batch file ends in an error :

  


  @Echo off
for /F tokens=i,j %%i in (*.MP4) %%j in (*.m4a) do ffmpeg -i "%%i" -i "%%j" -map 0 -map 1:a -codec  copy "/new/%%~nI.mp4"


  


  Error Message :
"i" cannot be processed syntactically at this point.

  


  Has someone a batch file for me, which is working ?

  


  Best regards

  


• Restart environment and script during batch script

  7 décembre 2024, par ninbura

  I've built a few FFmpeg powershell scripts for me and a few others to use and I'm attempting to make the setup and update process as easy as possible. The end goal is to be able to run 1 batch file that installs Chocolatey, FFmpeg, git, clones the github repo (for updates), and edits the Windows registry to add the actual FFmpeg powershell scripts / console programs to the Windows Explorer contextual menu. This way I just pass them the folder containing everything once and any time I change or add something to the project I can just tell them to run the batch file again, and presto everything is up to date.

  



  However I'm struggling to find a way to install Chocolatey, then git with Chocolatey, and then run a git command with the execution of a single .bat file. From what I can tell after installing Chocolatey I need to restart the shell entirely before I can install git, and then I have to restart the shell again before I can use a git command. As of right now most of the actual processing is happening via Powershell scripts that are launched from the .bat file, and as each step is taken I update a txt file, attempt to restart the batch script, and read the txt file to pick up where I left off :

  



  @echo off
echo Administrative permissions required. Detecting permissions...
echo.

net session >nul 2>&1
if %errorLevel% == 0 (
    echo Success: Administrative permissions confirmed.
    echo.
) else (
    echo Failure: Current permissions inadequate.

    PAUSE

    exit
)

set relativePath=%~dp0
set relativePath=%relativePath:~0,-1%

PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\CheckRequiredPackages.ps1" -relativePath "%relativePath%"

set /p step=<"%relativePath%\Setup\Step.txt"

if %step% == 1 (
    (echo 2) > "%relativePath%\Setup\Step.txt"

    PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\GetChocolatey.ps1"

    start "" "%relativePath%\RunMe.bat"

    exit
) 

if %step% == 2 (
    (echo 3) > "%relativePath%\Setup\Step.txt"

    PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\GetRequiredPackages.ps1"

    start "" "%relativePath%\RunMe.bat"

    exit
) 

if %step% == 3 (
    (echo 0) > "%relativePath%\Setup\Step.txt"

    PowerShell -NoProfile -ExecutionPolicy Bypass -File "%relativePath%\Setup\Update.ps1" -relativePath "%relativePath%"
) 

PAUSE
Exit


  



  The problem is using the start command in the batch script doesn't seem to work, I'm guessing since that new process is spawned from the same process that handles the Chocolatey install it doesn't count as actually restarting the shell. Is there any way to actually restart the shell and somehow have the batch file start back up without user intervention ?