From: nospam@needed.invalid   
      
   On Sat, 3/22/2025 10:20 AM, Carlos E.R. wrote:   
   > On 2025-03-22 14:42, TJ wrote:   
   >> On 2025-03-22 09:00, Carlos E.R. wrote:   
   >>> On 2025-03-22 07:57, Lawrence D'Oliveiro wrote:   
   >>>> On Fri, 21 Mar 2025 11:55:34 +0100, Carlos E.R. wrote:   
   >>>>   
   >>>>> On the other hand, I find that TV sets support for playing media is   
   >>>>> terrible.   
   >>>>   
   >>>> Get something like a Kodi box.   
   >>>   
   >>> Well, the laptop I already have, and would be gathering dust otherwise.   
   Actually, sometimes I run kodi on it.   
   >>>   
   >>> It is funny, some videos barely run on the laptop using VLC; however, they   
   run fine using kodi.   
   >>>   
   >>> Even if I recode those videos using ffmpeg, VLC can't play them. Sound is   
   good, video stalls.   
   >>>   
   >>>   
   >>>   
   >> Have you tried recoding with Handbrake? It has worked for me in the past.   
   >   
   > I haven't, but most tools use the same codec libraries.   
   >   
   > I tried these:   
   >   
   > time ffmpeg -i Source\ x265\ .mkv \   
   >     -map 0 -vf scale=1920:-1  -c:v libx264 -preset slow -crf 22 -tune   
   fastdecode -profile:v baseline  -c:a copy -c:s copy \   
   >     Dest\ baseline.mkv   
   >   
   > time ffmpeg -i Source\ x265\ .mkv \   
   >     -map 0 -vf scale=1920:-1  -c:v libx264 -preset slow -crf 22 -tune   
   fastdecode -profile:v main  -c:a copy -c:s copy \   
   >     Dest\ -\ main.mkv   
   >   
   > time ffmpeg -i Source\ x265\ .mkv \   
   >     -map 0 -vf scale=1920:-1  -c:v mpeg4 -vtag xvid -qscale:v 3  -c:a   
   copy -c:s copy \   
   >     Dest\ xvid.mkv   
   >   
   >   
   > I have trouble when the video uses x265. x264 is fine, so I was trying to   
   encode to x264. VLC on that laptop has trouble with those (I do the recoding   
   in another machine that is powerful).   
   >   
   >   
   > But if kodi can display the video, it is less effort and resources to watch   
   the movies in kodi. It is just curious, as both vlc and kodi link the same   
   libx265.so libraries.   
   >   
   >   
      
   Take it all the way back to RAW, then re-code it. Then you can   
   do bidirectional encoding if you want (for better random seek   
   behavior). Or for that matter, re-code with only keyframes,   
   high bitrate, and (almost no) compression :-)   
      
   One way to go back to a RAW format, is to store the video frames   
   as individual pictures in a folder. I've done that before, as   
   part of experimenting with video.   
      
   But don't expect the sound track to stay synchronized. Sound   
   only remains synced, if the video track and the audio track   
   have the original timestamps. What you will find on practical   
   videos, is the sound track speeds up or slows down at random.   
   If you use a video editor and attempt to "slide" the   
   sound track with respect to the video track, yes, you can   
   align the sound at a selected point on the video, but other   
   parts of the video are then improperly aligned.   
      
   *******   
      
   You can tell the FFMPEG library to use the hardware decoder   
   in the iGPU, like the Intel QuickSync encoder/decoder or   
   the like. You don't always have to use the software decoder   
   for this.   
      
   When you re-code using FFMPEG, you can spec hardware decoding   
   on input of the video, then software re-encode with the rest   
   of the FFMPEG command. You can even do the entire job   
   in hardware (about 10x speedup over software method).   
   But since NVENC and NVDEC are not switched on in the   
   Linux FFMPEG, you can recompile from source and   
   use ./configure to add back NVENC and NVDEC.   
      
   Doing this stuff, is more of a "hobby" than a ten minute   
   project :-) All I wanted to learn, is how long would it   
   take me to fix a video. My answer to that is   
   "book two weeks of your time for it".   
      
      Paul   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)