Recherche avancée

Sur d’autres sites (3159)

• ffmpeg, add static image to beginning and end with transitions

  14 mars 2021, par CreateChange

  ffmpeg noob here, trying to help my mother with some videos for real estate walkthroughs. I'd like to set up a simple pipeline that I can run videos through and have outputted as such :

  


  

  • 5 second (silent) title card ->

  


  • xfade transition ->

  


  • property walk through ->

  


  • xfade transition ->

  


  • 5 second (silent) title card

  


  


  Considerations :

  


  

  • The intro / outro card will be the same content.

  


  • The input walkthrough videos will be of variable length so, if possible, a dynamic solution accounting for this would be ideal. If this requires me to script something using ffprobe, I can do that - just need to gain an understanding of the syntax and order of operations.

  


  • The video clip will come in with some audio already overlaid. I would like for the title cards to be silent, and have the video/audio clip fade in/out together.

  


  


  I have gotten a sample working without the transitions :

  


  ffmpeg -loop 1 -t 5 -i title_card.jpg \
    -i walkthrough.MOV \
    -f lavfi -t 0.1 -i anullsrc \
    -filter_complex "[0][2][1:v][1:a][0][2]concat=n=3:v=1:a=1[v][a]" \
    -map "[v]" -map "[a]" \
    -vcodec libx265 \
    -crf 18 \
    -vsync 2 \
    output_without_transitions.mp4


  


  I have been unable to get it to work with transitions. See below for the latest iteration :

  


  ffmpeg -loop 1 -t 5 -r 60 -i title_card.jpg \
    -r 60 -i walkthrough.MOV \
    -f lavfi -t 0.1 -i anullsrc \
    -filter_complex \
    "[0][1:v]xfade=transition=fade:duration=0.5:offset=4.5[v01]; \
    [v01][0]xfade=transition=fade:duration=0.5:offset=12.8[v]" \
    -map "[v]" \
    -vcodec libx265 \
    -crf 18 \
    -vsync 2 \
    output_with_transitions.mp4


  


  This half-works, resulting in the initial title card, fading into the video, but the second title card never occurs. Note, I also removed any references to audio, in an effort to get the transitions alone to work.

  


  I have been beating my head against the wall on this, so help would be appreciated :)

  


• ffmpeg jpg batch script with timestamp

  3 juillet 2021, par Chris

  I currently have this batch script using ffmpeg to scale images and place in a new location with the same folder structure. How do i include the timestamp from the original jpg file in the filename of the new scaled jpg file ?

  


  This gives files named m-H-S_IMG_0305

  


  @echo off &setlocal
set /a nfile=0
echo Copying directory structure from %1 to %2 ...
xcopy /T "%~1" "%~2"
REM walk directory structure and convert each file in quiet mode
set "sourcefolder=%~1"
set "targetfolder=%~2"
for /R "%sourcefolder%" %%a in (*.JPG) do (
    echo converting "%%~nxa" ...
    set "sourcefile=%%~fa"
    set "sourcepath=%%~dpa"
    set "targetfile=%%~na.JPG"
    setlocal enabledelayedexpansion
    set "targetfolder=%targetfolder%!sourcepath:%sourcefolder%=!"
    ffmpeg -v quiet -i "!sourcefile!" -vf scale=256x256 -q:v 1 -strftime 1 "!targetfolder!%Y-%m-%d_%H-%M-%S_!targetfile!"
    endlocal
    set /A nfile+=1
)
echo Done! Converted %nfile% file(s)


  


  Working version for file modify date :

  


  @echo off &setlocal
set /a nfile=0
echo Copying directory structure from %1 to %2 ...
xcopy /T "%~1" "%~2"
REM walk directory structure and convert each file in quiet mode
set "sourcefolder=%~1"
set "targetfolder=%~2"
for /R "%sourcefolder%" %%a in (*.JPG) do (
    echo converting "%%~nxa" ...
    echo which has a timestamp of "%%~ta" ...
    set "sourcefile=%%~fa"
    set "sourcepath=%%~dpa"
    set "targetfile=%%~na.JPG"
    set "timestamp=%%~ta"
    setlocal enabledelayedexpansion
    set "timestamp=!timestamp: =_!"
    set "timestamp=!timestamp::=-!"
    set "timestamp=!timestamp:/=-!"
    set "targetfolder=%targetfolder%!sourcepath:%sourcefolder%=!"
    ffmpeg -v quiet -i "!sourcefile!" -vf scale=256x256 -q:v 1 "!targetfolder!!timestamp!_!targetfile!"
    endlocal
    set /A nfile+=1
)
echo Done! Converted %nfile% file(s)


  


  File Creation date option attempt using exiftool (This works but it stops frequently so there is an error somewhere) :

  


  @echo off &setlocal
set /a nfile=0
echo Copying directory structure from %1 to %2 ...
xcopy /T "%~1" "%~2"
REM walk directory structure and convert each file in quiet mode
set "sourcefolder=%~1"
set "targetfolder=%~2"
for /R "%sourcefolder%" %%a in (*.JPG) do (
    echo converting "%%~nxa" ...
    echo which has a timestamp of "%%~ta" ...
    set "sourcefile=%%~fa"
    set "sourcepath=%%~dpa"
    set "targetfile=%%~na.JPG"
    set "timestamp=('exiftool -d %%Y%%m%%d_%%H%%M%%S -CreateDate %%~a')"
    for /f "tokens=1,2 delims=x" %%a in ('exiftool -T -d %%Y%%m%%d_%%H%%M%%S -CreateDate "%%a"') do (
        set "timestamp=%%a"
    )
    setlocal enabledelayedexpansion
    set "targetfolder=%targetfolder%!sourcepath:%sourcefolder%=!"
    ffmpeg -v quiet -i "!sourcefile!" -vf scale=256x256 -q:v 1 "!targetfolder!!timestamp!_!targetfile!"
    endlocal
    set /A nfile+=1
)
echo Done! Converted %nfile% file(s)


  


• lavc/aarch64 : port HEVC SIMD idct NEON

  16 janvier 2021, par Reimar Döffinger

  lavc/aarch64 : port HEVC SIMD idct NEON
  Makes SIMD-optimized 8x8 and 16x16 idcts for 8 and 10 bit depth
  
  available on aarch64.
  
  For a UHD HDR (10 bit) sample video these were consuming the most time
  
  and this optimization reduced overall decode time from 19.4s to 16.4s,
  
  approximately 15% speedup.
  
  Test sample was the first 300 frames of "LG 4K HDR Demo - New York.ts",
  
  running on Apple M1.
  Signed-off-by : Josh Dekker <josh@itanimul.li>
  

  • [DH] libavcodec/aarch64/Makefile
  • [DH] libavcodec/aarch64/hevcdsp_idct_neon.S
  • [DH] libavcodec/aarch64/hevcdsp_init_aarch64.c
  • [DH] libavcodec/hevcdsp.c
  • [DH] libavcodec/hevcdsp.h