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• ffmpeg video splitting less then 10 sec gives black clip - ubuntu 18.04 LTS

  9 juillet 2020, par vipin

  I am using FFmpeg version 4.3-2 18.04.york0 on AWS EC2 server for video splitting, while I split video less then 11 seconds the output.mp4 gives a blank video. I have tried the same thing with my local MAC and Ubuntu 19 but it works fine.

  


  ffmpeg -i input.mp4 -ss 00:01:10 -to 00:01:15 -c:v copy -c:a copy output.mp4


  


• FFMPEG two black frames in the beginning when converting mp4 aac to mov pcm [closed]

  12 octobre 2023, par Veikka

  I'm trying to convert mp4 h265 aac file to mov 265 pcm16sle file using ffmpeg withoat touching the video stream. When opening the file in DaVinci Resolve, there is two black frames in beginning.

  


  I used this ffmpeg command :

  


  ffmpeg -i file.mp4 -map_metadata 0 -c:v copy -c:a pcm_s16le file.mov


  


  For some reason this command changes timestamp info :

  


  file.mp4
---
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 519000,
"duration": "20.760000",
"bit_rate": "80688676",

file.mov
---
"start_pts": 2000,
"start_time": "0.080000",
"duration_ts": 517000,
"duration": "20.680000",
"bit_rate": "81000818",


  


  I also get this error when converting file :

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x565392b65800] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000


  


  I found this bug report, but there didn't found any fixes to my problem.

  


  file.mp4 edit lists looks like this :

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x561fc98ff800] track[0].edit_count = 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x561fc98ff800] Processing st: 0, edit list 0 - media time: 1000, duration: 519000
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x561fc98ff800] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x561fc98ff800] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x561fc98ff800] track[1].edit_count = 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x561fc98ff800] Processing st: 1, edit list 0 - media time: 0, duration: 996353


  


  AAC timecode and H265 has almost same duration withoat the media time: 1000 starting time :

  


  AAC timebase is 1/48000

  


  996353/48000 = 20.75735416666666666667


  


  H265 timebase is 1/25000

  


  519000/25000 = 20.76


  


• How can I add "retro-looking" black round cornert to my videos ?

  4 mars 2020, par user3018558

  I’m looking to add (e.g. overlay) some retro/cinematic effect to my video and specifically the black rounded corners.
  Can this be achieved via ffmpeg ? I’m actually using Handbrake mainly but since it relies on ffmpeg I guess I could pass something as a parameter in Handbrake’s Video/Advanced/options to affect the output file ?

  I mean one option would be to add an overlay I guess like :
  

  But considering the input files have different resolution/aspect-ration I would ideally be looking to have this dynamically added to the output file.

  Any idea/tip ?

  Thanks