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• Video playing slow on Rock 3a / Banana Pi 4 and Odroid

  21 décembre 2022, par Alain Vanderbroeck

  I want to play 1080p fullscreen video on another device as Raspberry Pi.
Currently i am testing Rock 3A

  


  The video plays very laggy.

  


  Can someone please help me on this one ?

  


  

  • Which codec should i use ? (currently libx264)

  


  • Which player should i use ? (currently mplayer)

  


  • What are the player settings ? (currently no extra settings)

  


  • Which OS should i use ? (currently tested Ubuntu Mate and Armbian)

  


  


  Regarding to this link : https://forum.armbian.com/topic/22476-video-playback/
i should patch ffmpeg. But how do i patch it.
Or should i use Kodi ?

  


• FFMPEG : merge mkv + audio + subtitles [closed]

  24 décembre 2022, par vespino

  I have a 4K video with Japanese audio and a 1080p video with English audio. I have extracted the audio from the English video file and would like to know how to merge the following files :

  


  jap_video.mkv
eng_audio.acc
nld_subtitles.srt


  


  I don't mind the original audio and subtitles overwritten, I would like to end up with just 1 file containing my audio and my subtitles.

  


  This is how I merge jap_video.mkv + eng_audio.acc

  


  ffmpeg -i jap_video.mkv -i eng_audio.acc -c:v copy -map 0:v:0 -map 1:a:0 output.mkv


  


  Following this I merge output.mkv + nld_subtitles.srt

  


  ffmpeg -i output.mkv -f srt -i nld_subtitles.srt -map 0:0 -map 0:1 -map 1:0 -c:v copy -c:a copy -c:s srt -metadata:s:s:0 language=nld output_srt.mkv


  


  This works fine, but is it possible in one command ? A nice to have would be to name both audio and subtitles as I'm doing with the second command.

  


• Extracting a bit broken AC3 audio from a video file

  3 janvier 2023, par WYSIWYG

  I Googled for about 2 hours for this problem and I can't seem to find the answer anywhere.

  


  So I have a 1080p video file which has about 2 seconds within it that's broken (at 3 minutes and 53 seconds). I found a way to extract the non-broken parts of it, also I got a replacement for the broken frames from another version of the same video (in 720p), upscaled them to 1080p and replaced them in the 1080p file (reencoding the whole file in the process). Here comes the problematic part - at the same time (3 min 53 sec), the audio is also broken and it's in Dolby Digital 5.1 AC3 format. When I try to extract the audio track from the original 1080p file and place the result in the new fixed version, which contains the upscaled video frames, the audio obviously is cut at the problematic 2 seconds and it desyncs (starts to play earlier) for the rest of the file.

  


  What I want to do and I'm unable to understand how to do it is to extract the AC3 stream in such a way that the 2 broken seconds are filled with silence and the total length of the audio stay the same as the original, so it won't desync. Is this possible and if it is, what is the correct FFMPEG command for it ?

  


  Thank you in advance.

  


  I've tried :

  


  ffmpeg -i broken.mkv -c:a copy audio.ac3

  


  which presented an output AC3 file, which is missing the 2 seconds from 03:53 to 03:55

  


  so when I combine the resulting AC3 file with the repaired video, by using :

  


  ffmpeg -i fixed.mkv -i audio.ac3 -c copy fixed-with-audio.mkv

  


  it is desynced, so at video time 03:53 I hear the audio that should play at 03:55