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• Concat gives flickering result

  4 avril 2016, par Robin Castlin

  I really don’t get this ; I use ffmpeg concat one 2 files and the audio is concated well, but the videos aren’t. The second video causes freeze/flicker/green screen instead.

  'ffmpeg -y -f concat -i concat.txt -c:v libx264 -pix_fmt yuv420p -c:a copy output.mkv

  Comparing the files, I have made them as identical as possible :

  • input.mkv1
    
    Video: MPEG4 Video (H264) 1280x720 60fps [V: h264 main L4.1, yuv420p, 1280x720 [default]]
Audio: AAC 48000Hz stereo [A: aac, 48000 Hz, stereo [default]]
  • input2.mkv
    
    Video: MPEG4 Video (H264) 1280x720 60fps [V: English [eng] (h264 main L4.1, yuv420p, 1280x720) [default]]
Audio: AAC 48000Hz stereo [A: English [eng] (aac, 48000 Hz, stereo) [default]]

  What could cause this behavior ?

  

• FFMPEG : Convert multiple movies into plex direct play format

  4 avril 2021, par Sascha

  I have a large movie base which I watch over plex (Apple TV plex client with raspberry 4 plex server). However, for standardization and to ensure better direct play with plex, I wanted to convert the movies/series to new format.

  


  Therefore, my idea was to convert all movies to

  


  

  1. 1080p (1920*1080) / 16:9

  


  2. 30 fps

  


  3. mkv container

  


  4. H.264 (libx264)

  


  5. 8 bit Video Depth

  


  6. 320 kbps audio AAC

  


  7. keep only German and English version (audio / subtitle)

  


  


  which seems to be good settings for sustainable standardization. Dont know, if other settings (e.g. hevc) would be better. However, I can't combine the commands with the right ffmpeg options to let my server convert in the background. By now, I came up with the following two commands, which I want to combine, once ffmpeg gives me the right output, which it does not at the moment. It breaks in the conversion process and does not keep only German and English subtitles and audio. I

  


  Hope someone can help me out. Thanks a lot.

  


  find . -name '*.mp4' -or -name '*.wav' -exec ffmpeg -i {} basename {}.mkv \; -exec rm {} \;

for f in *.mkv; do echo "Starting with ${f} @ $(date +%T)"; ffmpeg -hide_banner -i "${f}" -map_metadata:g -1 -movflags faststart -c:v libx264 -preset slow -crf 20 -pix_fmt yuv420p -vf scale=1920:-1,setdar=16/9 -filter:v fps=fps=30 -c:a aac -b:a 320k -map0:s "${f}.2.mkv"; echo "Finished with ${f} @ $(date +%T)"; done


  


• FFMPEG encode audio and forced subtitles at same time ?

  8 janvier 2017, par Nick Bell

  I’m using latest static build of ffmpeg windows.

  My input file (.mkv) is :

  [video] - 1080, V_MPEG4/ISO/AVC, 14.6 Mbps, ID#0
  
  [audio] - DTS 5.1, 1510 Kbps, ID#1
  
  [subtitles] - S_TEXT/ASS Lossless English, ID#14

  My problem is this : I convert the audio, so that my target player, a XB1 console (media support faq), is able to play audio/video. However sometimes its rather difficult to hear or parts may be in foreign language, so I want to force the english subtitles into the mix at the same time I convert the audio.

  Currently for the audio, I use the following command

  ffmpeg -i input.mkv -codec copy -acodec ac3 output.mkv

  Can I somehow tie in the forced subtitles (onto the video) in order to save an extra process of taking the output.mkv and trying to force subtitles on ?

  Edit : I’ve tried using the following command to extract subtitles to be able to edit them

  ffmpeg -i Movie.mkv -map 0:s:14 subs.srt

  However i get the error : Stream map '0:s:14' matches no streams

  Edit2 : attempted to extract subtitles and succeeded with

  ffmpeg -i input.mkv -map 0:14 -c copy subtitles.ass

  but still looking to force the subtitles, nonetheless !

  Also - a little bonus to this question - can I somehow extract the .ass file and edit it to only produce subtitles for foreign parts - so english audio doesn’t have subtitles during the movie but foreign audio does have subtitles ?

  Cheers

  Edit3 :

  When I try to use both of the commands at once (my earlier mentioned audio converter & one from the ffmpeg wiki)

  ffmpeg -i input.mkv -codec copy -acodec ac3 -vf "ass=subs.ass" output.mkv

  I get the following error from ffmpeg,

  Filtergraph 'ass=subs.ass' was defined for video output stream 0:0 but codec copy was selected.
  
  Filtering and streamcopy cannot be used together.