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• I want FFMPEG generate the m3u8 file with the oldest segments instead of the newest

  4 juin 2021, par Sandi

  I have an FFmpeg command like this :

  


   ffmpeg -i test.mp4 -f hls -hls_time 2 -hls_wrap 10 -hls_list_size 5 test.m3u8


  


  Afaik, hls_wrap is the number of segments we want to store locally and hls_list_size is the segment listed in the m3u8 output file. The command above will generate 10 files of the video segment.

  


  [seg 0][seg 1][seg 2][seg 3][seg 4][seg 5][seg 6][seg 7][seg 8][seg 9]


  


  And inside the test.m3u8, of course, there are 5 newest segments listed.

  


  [seg 5][seg 6][seg 7][seg 8][seg 9]


  


  I want the test.m3u8 lists the oldest available segment instead of the newest. So it should contain :

  


  [seg 0][seg 1][seg 2][seg 3][seg 4]


  


  In another word, I want to preload the segments before it listed in test.m3u8.

  


  The idea is I want to rsync the output of that FFmpeg command to a different folder on the network. I want to avoid test.m3u8 contains a segment that not completely copied because of the large segment size.

  


  Please help me and pardon my English. Thank you very much !

  


• 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

  


• Combining Video and Audio of different length in bulk

  27 avril 2017, par user2981223

  I am going through a tv series right now and editing the files to be to my liking. I have one set which has the video I want and one set that has the audio. I have a batch file that I can run that takes the video from every file in folder "A" and the audio from every file in folder "B" and outputs it to a folder named "output." But with this particular series, that is only half of what I need done.

  At the end of every episode of the files in the "B" folder there are some extra things. What I would like to do is take the audio and video from "A" and the audio from "B", combine it all into one file and also take the "A" and "B" files, compare the time stamps, and add the extra video from "B" to the output file.

  Let me put it another way. Let’s say "A" is 1080p with Japanese audio and is 20 minutes long. Let’s say "B" is 720p with English audio and is 23 minutes long. I want the whole 1080p video with both audio tracks, plus the 720p video spliced onto the end. Both files start at the same spot so syncing isn’t an issue. The issue is that the difference in time is different for every episode. So some episodes are 3 minutes longer, some only 30 seconds. Is there a way to make ffmpeg or another tool look at the difference in times and just add the excess to the output file ?

  Sorry for being long winded. Thanks for any help and guidance.