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• FFMPEG store method : Separated fields ?

  17 février 2021, par Caloux Fld

  I am using FFMPEG with GPU h264_nvenc codec to upscale MPEG2 interlaced files.
h264_nvenc generate h264 with the store method : Separate fields (in mediaInfo) instead of the store method : Interleaved fields. These files with separate fields seems to be incompatible with tools like GVG Edius. How to change this store method ?

  


  with ffmpeg version N-92103-gebc3d04b8d Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 8.2.1 (GCC) 20180813

  


  Command FFMPEG :

  


   -ss 00:14:45  -hwaccel cuda   -c:v mpeg2_cuvid  -i "input.mpg" -t 00:00:10 -vf "scale=if(gt(dar\,1.6)\,1920\,1460):1080:flags=lanczos:interl=1" -c:v h264_nvenc  -pix_fmt nv12 -flags +ilme+ildct -b:v 16M -maxrate:v 22M -bufsize:v 8M -profile:v high -level:v 4.1 -rc:v vbr  -coder:v cabac -f mp4 -y "inputUpscaled_GPU.MP4"


  


  mediainfo testUpscale_GPU.MP4 :

  


  Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4.1
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 1 frame
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 10 s 0 ms
Bit rate mode                            : Variable
Bit rate                                 : 17.8 Mb/s
Maximum bit rate                         : 22.0 Mb/s
Width                                    : 1 460 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Original frame rate                      : 50.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Interlaced
Scan type, store method                  : Separated fields
Scan order                               : Top Field First
Bits/(Pixel*Frame)                       : 0.451
Stream size                              : 21.2 MiB (99%)
Codec configuration box                  : avcC


  


• trim MULTIPLE .mp4 files using ffmpeg in WINDOWS DOS

  22 février 2014, par user1530322

  My goal is to trim the first 4 seconds of, say 100 .mp4 files at once.

  I can easyly do it and in a quite quick way for one single .mp4 file at a time using :

  **ffmpeg -i MYFILE.mp4 -ss 00:00:04.000 -c:v copy -c:a copy Trimmed_MYFILE.**mp4

  I have a folder with those 100 mp4 files and want to bulk trim the first 4 seconds and save the new files on a folder in the same location called "newfiles".

  I'm imagining something like a loop, using FOR or so, but have no ideia how to do it.

  Thank you in advanced

• Old TV : ffmpeg-converted file not working

  29 décembre 2016, par senseiwa

  I have an old Full-HD TV (Philips) that supports USB reading with some video formats. However, it just supports one audio stream (the first), so in case I have two with the first that is not english, I need to remove the first one. I am doing this via ffmpeg, but the TV cannot read the converted file, although they are identical (except for one audio track).

  The conversion command I am using is is

   ffmpeg -i filename.IN -map 0:0 -map 0:2 -acodec copy -vcodec copy  filename.OUT

  to just copy the video/audio stream, but keeping only the second audio track. The original file is this one (output of ffprobe) and it works perfectly reproducing the video with the first audio track :

  Input #0, avi, from 'ORIG.avi':
  
    Metadata:
  
      encoder         : X
  
    Duration: 01:40:57.18, start: 0.000000, bitrate: 2695 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 656x368 [SAR 1:1 DAR 41:23], 1914 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s
  
      Stream #0:2: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s

  and the converted not working one is

  Input #0, avi, from 'CONV.avi':
  
    Metadata:
  
      encoder         : Lavf57.56.100
  
    Duration: 01:40:57.18, start: 0.000000, bitrate: 2309 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 656x368 [SAR 1:1 DAR 41:23], 1914 kb/s, 23.98 fps, 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 384 kb/s

  On a PC, however, they both work.

  The question is, how can I convert, keeping eventually just one audio track, in a format that my TV supports without losing quality ?

  I do not have the list of supported codecs, but I have a list of videos that the TV is able to reproduce.