Recherche avancée

Sur d’autres sites (9756)

• avformat/iff : check size against INT64_MAX

  27 octobre 2020, par Michael Niedermayer

  avformat/iff : check size against INT64_MAX
  Bigger sizes are misinterpreted as negative numbers by the API
  
  Fixes : infinite loop
  
  Fixes : 26611/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-4890614975692800
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/iff.c

• Encoding videos with mixed aspect ratios in hevc [closed]

  25 octobre 2020, par bader515

  I have a huge library of movies, TV Shows, Anime, and Cartoons (about 16tb sorted by plex on my NAS).

  


  Most of them are encoded in h.264, and each video has a different aspect ratio (1920x1080,1280x720...etc).

  


  Is there a way to re-encode them using any tool to hevc with the same aspect ratio and bit per pixel ?

  


  I have already tried using this command using ffmpeg, but the result is a bigger size video (with the sd videos) :

  


  pushd "%2"
SET paths=paths.txt
SET /A ffmpeg_qv=24
if EXIST %paths% (
for /f "tokens=*" %%a in (%paths%) do (
    echo Changing to directory %%a
    pushd "%%a"
    CALL :ffmpeg
    )
) else (
CALL :ffmpeg
)
pause
EXIT /B %ERRORLEVEL%
  :ffmpeg
    for /R %%A in (*.mp4, *.avi, *.mov, *.wmv, *.ts, *.m2ts, *.mkv, *.mts) do 
(
        echo Processing "%%A"
    ffmpeg -hwaccel auto -i "%%A" -pix_fmt yuv420p -map 0:v -map 0:a -map_metadata 0 -c:v hevc_nvenc -rc constqp -qp %ffmpeg_qv% -b:v 0K -c:a aac -b:a 384k -movflags +faststart -movflags use_metadata_tags "%%A_CRF%ffmpeg_qv%_HEVC.mp4"
    echo Processed %%A
)
GOTO :EOF


  


• Video getting darker after Chromakey overlay with FFMPEG

  22 octobre 2020, par João Raimundo

  I'm trying to use FFMPEG to programatically put an overlay with greenscreen, and I'm using the following command :

  


  ffmpeg -i bg.mp4 -i gs.mp4 -filter_complex "[1:v]chromakey=0x1aa700:0.18:0.01 [ckout];[0:v][ckout]overlay[out]" -preset ultrafast -map "[out]" output.mp4


  


  My problem is that, in background videos bigger than the video with chromakey when the video with chromakey ends, the output video gets darker on black (depending on blend values), as seen in this video.

  


  The idea is to use this command with Python, so, if you know another way to remove chromakey and overlay vídeos with Python, I would like to know !

  


  Thank you in advance !