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• split videos with ffmpeg

  23 novembre 2020, par 5Diraptor

  I'm trying to create a script that scans a directory, and for all videos larger then X size, splits them down into smaller chunks.

  


  There are two similar questions :

  


  

  • Using ffmpeg to split video files by size

  


  • Split into equal parts and convert many mp4 videos using ffmpeg

  


  


  Neither of these work in the way I want. The first you have to manually input every file that you want to process. The second doesn't check for filesize, or output the files in the way I want.

  


  So far, this is the contents of the .bat file :

  


  %~d1&#xA;&#xA;for %%a in (*.MOV) do (&#xA;&#xA;if %%~za GTR 2000000000 (&#xA;&#xA;REM usage %%a <filename>&#xA;set "_filename=%~n1"&#xA;set "_tally=.SPLIT-%03d"&#xA;set "_extension=%~x1"&#xA;&#xA;set "_outputname=%_filename%%_tally%%_extension%"&#xA;&#xA;&#xA;    ffmpeg -i "%%a" ^&#xA;        -crf 0 -c copy -map 0 -segment_time 00:00:30 -f segment -reset_timestamps 1 ^&#xA;        %_outputname%&#xA;)&#xA;)&#xA;pause&#xA;</filename>

  


  My aim is for the script to work in the following way :

  


  

  1. Drag a video (from a folder of videos) onto the .bat file.

  


  2. Script opens up, and targets each file ending .MOV, and is greater then 2GB

  


  3. ffmpeg splits the video down into >2GB chunks. (I know it's currently split down in 30 second chunks, still working on understanding how to use the -fs parameter).

  


  4. Each chunk gets saved with the original filename and extension, but the filename is suffixed with ".SPLIT" and then a unique number that relates to which file it is - first file is 000 and second is 001 etc.

  


  


  Problems :

  


  

  • Firstly, I want to split by filesize and not time, but I don't understand how to use the -fs parameter in this case. I guess I could use something like ffprobe -i input.file -show_format -v quiet | sed -n 's/duration=//p' in conjunction with it but I'm not confident...

  


  • Secondly, I'm getting a problem with %03d in the .bat. Think I'm mixing up languages ? It retrieves the filepath of the .bat file instead of counting number of loops.

  


  


  Any help really appreciated !

  


• ffmpeg - correctly handling misaligned audio/video input stream before outputting to rtmp

  4 décembre 2020, par hedgehog90

  I use a video player called MPV to transcode a dynamic playlist of media files.

  


  I pipe MPV's encoded output into FFMPEG and format it for rtmp delivery.

  


  However the playlist may contain media with misaligned audio and video, ie - the audio track may be shorter / longer than the video track.

  


  No matter what MPV will only output what it's given. So if my media file has audio that is 1 second long and video that is 2 seconds long, it will output a media stream with exactly the same misalignment, rather than generating null audio or skipping to the next item in the playlist when it first encounters an active stream ending (eof).

  


  For example, assuming my playlist was full of problematic media where the audio and video of each file was misaligned :

  


  

  


  If I output this media stream to a popular streaming service's server, it could lead to stuttering and/or loss of a/v sync.
Similarly, if I output this media stream to a file and played it back in MPV or another video player, the result appears to be more like this :

  


  

  


  I have tried to fix this in MPV in all sorts of ways, trying every relevant command line option available. I even wrote a user script that detects 'eof' audio and skips to the next item in the playlist, but it is not fast enough and still leads to small gaps of audio.

  


  So my only hope is correcting it in ffmpeg. In the event of null audio/video, I need a fallback or a generative filter that can fill these empty gaps with silence (audio) or a colour/image (video).

  


  I'm open to any ideas, and if my understanding in a/v encoding is a little off please educate me.

  


• Complex, how to -o, -mv or similar into this code ? [closed]

  13 décembre 2020, par Sounds Good

  Trying to change location of output file
Using Windows>Ubuntu app>Shell/Cmd>Bash (because Windows alone code does not work at all)
Using Ffmpeg/Youtube-dl/Sed together
It works on its own :

  


  ffmpeg $( youtube-dl -f bestvideo+bestaudio --youtube-skip-dash-manifest -g https://www.youtube.com/watch?v=zSyNOO_gvUY | sed "s/.*/-ss 04:09 -to 04:15 -i &/") -map 0:v -map 1:a -c:v libx264 -c:a aac name.mp4

  


  Bash starts as : :/mnt/c/Users/Machine$

  


  Fallowing just few of many problems I tried to figure out for this :

  


  should I use / or \ to "subfolder"

  


  Start from / or C or Desktop etc.

  


  does -o need to be configured and if so how

  


  placements after Youtube-dl or in the ending by keeping name.mp4 or not, or changing it to
'-o %(title)s.%(ext)s' (title change needed as well thought)

  


  help.