Recherche avancée

Sur d’autres sites (4954)

• Fixing audio/video out of sync when editing recorded broadcast

  27 décembre 2019, par sba

  I have recorded broadcast-ed material using a DVB-T tuner.

  That produces several TS files per recording (most likely to keep filesize within FAT32 limitations).

  I have concatenated each recording into a single TS file using :

  ffmpeg.exe -f concat -i $filelist -c copy -y $outputfile

  From there, I need to perform edits to remove commercials, strip extra stuff from the start and end, and optionally extract each episode into a separate file.

  I own Pinnacle Studio 23 Ultimate, that doesn’t support TS as input so I’m converting TS to MP4 using something like :

  ffmpeg -y -i foo.ts -crf 18 -ac 2 -r 25 -c:v libx265 -ar 48000 -b:a 192k -c:a aac -aspect 16:9 bar.mp4

  (I’ve tried several ways/options, including using HandBrake for that conversion).

  What happens is that in the resulting edited material, audio and video are out of sync. Can be in the whole file, or only in some sections.

  This could be linked to glitches (missing frames...) in the original recording.

  But when I play the original single-file TS, or the MP4 version, in any player such as VLC, audio and video are properly aligned. So these players are able to deal with the aforementioned glitches and "re-align" the audio and video streams.

  How can I "rewrite" the whole input file in such a way that audio and video are "fully synchronized" so that editing will be possible ?

  Thanks in advance for your help.

• Possible Duplicate : Batch convert all files in folder and sub folder using FFMpeg with different output folder

  8 janvier 2020, par Cecila Tarjon

  I know that the part of this is a duplicate to How would I write a batch file to run an ffmpeg command on an entire directory ? and How do you convert an entire directory with ffmpeg ?.

  I am currently using the command prompt to navigate to the directory in question and then running the command line

  for %i in (*.mkv) do c:\ffmpeg\bin\ffmpeg -i "%i" -c copy -map 0 %userprofile%\documents\Plex\mp4\%~ni.mp4"

  I would like to be able to run this on a higher level (ie %userprofiles%\Plex\MKV instead of ...\mkv\show\season) and have it run on all sub folders. I would also ideally like for it to output to the mp4\show\season level for the same place it get them from.

  Any advice ?

  Note : this is for remuxing to MP4 so I can use it on my Roku as well as from my Plex. Once I know it will work in a regular command window I will be converting it to a batch file so i can run as needed.

• Recursively converting all files in folder using FFMpeg and placing them in different output folder

  10 janvier 2020, par Cecila Tarjon

  I want to remux some videos to MP4 so that I can play them on my Roku as well as my Plex. I have reviewed the approaches suggested in the answers to the questions
  How would I write a batch file to run an ffmpeg command on an entire directory ? and How do you convert an entire directory with ffmpeg ?, but this doesn’t quite solve my problem.

  I am currently using the command prompt to navigate to the directory in question and then running the command line :

  for %i in (*.mkv) do c:\ffmpeg\bin\ffmpeg -i "%i" -c copy -map 0 %userprofile%\documents\Plex\mp4\%~ni.mp4"

  I would like to be able to run this from a higher level (i.e., %userprofiles%\Documents\Plex\MKV instead of ...\mkv\show\season) and have it run on all subfolders.

  I would also ideally like for it to output to the mp4\show\season level for the same place it gets them from.

  How can I accomplish this ?

  Once I know it will work in a regular command window, I will be converting it to a batch file so I can run as needed.