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• RGB to YUV422 conversion with ffmpeg, incorrect colors

  22 janvier 2016, par user3578571

  I’m trying to convert an 8bit RGB uncompressed to an mpeg2 mxf file (xdcam 422 HD 1080 50i) which is YUV422. With info from the FFMpeg docs and various websites i made the following command :

  ./ffmpeg -y -i test_lines.mov  -pix_fmt yuv422p -vcodec mpeg2video -non_linear_quant 1 -flags +ildct+ilme -top 1 -dc 10 -intra_vlc 1 -qmax 2 -vtag xd5c -rc_max_vbv_use 1 -rc_min_vbv_use 1 -g 12 -b:v 50000k -minrate 50000k -maxrate 50000k -bufsize 8000k -acodec pcm_s24le -ar 48000 -bf 2 -ac 2 lines_HD.mxf

  This gave me a result with the colors much brighter than the original.

  So i tried adding the options -color_range 1 -colorspace 1 -color_primaries 1 -color_trc 1 but this didn’t seem to do anything.

  After adding colormatrix=bt601:bt709 i got a way better image, but slightly darker than the original and it also feels weird specifying this option cause the source is also in the REC709 colorspace, so why specify it differently ?

  Next i regenerated my source image to an YUV codec (prores) and rerun FFMpeg on it with the colors coming out just fine. Therefore i think it has to be an RGB -> YUV problem.
  Does somebody have an idea how to this properly ? I can provide screenshots of the different results on a videoscope as soon as i’m back at the office, if anybody is interested.

  Last, i know there are various topics touching this subject but either they go way over my head FFmpeg wise or bring me to the stage where i already am.

• Creating TS file from MP4 file - Differing durations

  2 mai 2018, par Mark Walsh

  I am running the following command to crop an MP4 file

  -i "C:\FFMPEG\Temp\S3\2ad239d1-f4b9-4854-afe4-7e28157893daHighRes.mp4" -q:v 0 -y -ss 00:00:01.000 -to 00:00:29.834 -vf "fade=t=out:st=29.334:d=0.500, scale=iw*min(1080/iw\,720/ih):ih*min(1080/iw\,720/ih),pad=1080:720:(1080-iw)/2:(720-ih)/2" "C:\FFMPEG\Temp\Crops\5ae9806e32ab040978d97013_0.ts"

  As you can see I want to crop a video of exactly 28834 milliseconds long. However the created file when inspecting it via ffprobe is 28873 milliseconds long. Why is this ?

• Win Batch : Not getting data from array that works just a line above it

  5 mai 2018, par HASJ

  This code is from a CLI batch video converter that I’m trying to make using FFmpeg.

  ::@echo off
  
  setlocal enableDelayedExpansion
  
  ::Create variable so that the CMD can understand "NL" as a New Line
  
  ::Both spaces are needed
  
  set NL=^
  
  
  
  
  
  :choice
  
  echo [1] Single input!NL![2] Single input with multiple resolutions!NL![3] Multiple inputs!NL![4] Multiple inputs with multiple resolutions!NL![5] Exit
  
  set /p choice="Choose: "
  
  if /I %choice% EQU 1 goto :setSingleInput
  
  if /I %choice% EQU 2 goto :setSingleInput
  
  ::Please already have your files in the Clipboard before choosing options [3] or [4]
  
  if /I %choice% EQU 3 goto :getFileList
  
  if /I %choice% EQU 4 goto :getFileList
  
  if /I %choice% EQU 5 goto :EOL
  
  
  
  :setSingleInput
  
  set /p input="Input: "
  
  mediainfo --Output=Video;"%%Height%%" %input%> %temp%\ffmpegres.txt
  
  set /p height=< %temp%\ffmpegres.txt
  
  ::del %temp%\ffmpegres.txt
  
  if /I %choice% EQU 1 goto :inputSingle
  
  if /I %choice% EQU 2 goto :inputMultiple
  
  
  
  :inputSingle
  
  if /I %height% GTR 720 goto :1080
  
  if /I %height% GTR 480 if /I %height% LEQ 720 goto :720
  
  if /I %height% LSS 481 goto :480
  
  
  
  :inputMultiple
  
  if /I %height% GTR 720 goto :1080m
  
  if /I %height% GTR 480 if /I %height% LEQ 720 goto :720m
  
  if /I %height% LEQ 481 goto :480m
  
  
  
  :getFileList
  
  Powershell Get-Clipboard > %temp%\ffmpeglist.txt
  
  ::Thanks to MichaelS for the following code https://stackoverflow.com/a/32717316/5833369
  
  set fileList=%temp%\ffmpeglist.txt
  
  set x=1
  
  if /I %choice% EQU 3 goto :inputVarious
  
  if /I %choice% EQU 4 goto :inputVariousMultiple
  
  
  
  :inputVarious
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;%%Height%% !%input[%x%]%! > %temp%\ffmpegres%x%.txt
  
  set %height[1]%=< %temp%\ffmpegres%x%.txt
  
  set /a x=%x%+1
  
  )
  
  set x=1
  
  echo %height[1]%
  
  goto :EOL
  
  ::if /I !height[%x%]! GTR 720 goto :1080v
  
  ::if /I !height[%x%]! GTR 480 if /I !height! LEQ 720 goto :720v
  
  ::if /I !height[%x%]! LSS 481 goto :480v
  
  
  
  :inputVariousMultiple
  
  if /I !height! GTR 720 goto :1080vm
  
  if /I !height! GTR 480 if /I !height! LEQ 720 goto :720vm
  
  if /I !height! LSS 481 goto :480vm
  
  
  
  :1080
  
  echo Encoding %input% @ %height%p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 %input%.%height%p.mkv
  
  goto :choice
  
  
  
  :720
  
  echo Encoding %input% @ %height%p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 22 %input%.%height%p.mkv
  
  goto :choice
  
  
  
  :480
  
  echo Encoding %input% @ %height%p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.%height%p.mkv
  
  goto :choice
  
  
  
  :1080m
  
  echo Encoding %input% to 1080p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 %input%.1080p.mkv
  
  echo Encoding %input% to 720p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-1:720 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 %input%.720p.mkv
  
  echo Encoding %input% to 480p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.480p.mkv
  
  goto :choice
  
  
  
  :720m
  
  echo Encoding %input% to 720p and 480p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 %input%.720p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.480p.mkv
  
  goto :choice
  
  
  
  :480m
  
  echo Encoding %input% to 480p and 360p x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 %input%.480p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i %input% -c:v libx265 -vf scale=-1:360 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 600k -crf 17 %input%.360p.mkv
  
  goto :choice
  
  
  
  :1080v
  
  echo Encoding !input[%x%]! @ !height[%x%]!p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 !input[%x%]!.!height!p.mkv
  
  set /a x=%x%+1
  
  )
  
  del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :720v
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! @ !height[%x%]!p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 !input[%x%]!.!height!p.mkv
  
  set /a x=!x!+1
  
  )
  
  del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :480v
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! @ !height[%x%]!p to x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.!height!p.mkv
  
  set /a x=!x!+1
  
  )
  
  del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :1080vm
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! to 1080p, 720p and 480p with x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 3000k -crf 23 !input[%x%]!.1080p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-1:720 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 !input[%x%]!.720p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.480p.mkv
  
  set /a x=!x!+1
  
  )
  
  ::del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :720vm
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! to 720p and 480p with x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 2000k -crf 21 !input[%x%]!.720p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-2:480 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.480p.mkv
  
  set /a x=!x!+1
  
  )
  
  ::del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :480vm
  
  for /F "delims=|" %%l in (%fileList%) do (
  
  set input[%x%]=%%l
  
  mediainfo --Output=Video;"%%Height%%" !input[%x%]!> %temp%\ffmpegres%x%.txt
  
  set height[%x%]=< %temp%\ffmpegres%x%.txt
  
  echo Encoding !input[%x%]! to 480p and 360p with x265
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 1000k -crf 19 !input[%x%]!.480p.mkv
  
  ffmpeg -y -hide_banner -hwaccel cuvid -loglevel error -i !input[%x%]! -c:v libx265 -vf scale=-1:360 -x265-params log-level=error -t 15 -c:a copy -preset ultrafast -b:v 600k -crf 17 !input[%x%]!.360p.mkv
  
  set /a x=!x!+1
  
  )
  
  ::del %temp%\ffmpeg*.txt
  
  goto :choice
  
  
  
  :EOL
  
  ::endlocal
  
  pause

  Everything works until it gets to !%input[%x%]%! in the :inputVarious group.

  Because this is the output I get from that line :

  mediainfo --Output=Video;%Height% !x!  1>\Temp\ffmpegres1.txt

  What I’m trying to do is get the data stored in the input[x] array position and send it to mediainfo as input, so that it can get the video’s resolution, store that into the height[x] array.

  I have no idea what I’m doing wrong. Could someone help me ? Tips on how to make the code less redundant and more elegant are also appreciated.

  Obs. : I tried to recreate this in Python but I’m too much of a bad study and couldn’t get working (although what I was able to do, was done in a less janky way)