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  1. Hi everybody,
    I have trouble with transcoding a h264 file into a DVD-Video compatible mpeg2 file.

    The h246 source file aspect ratio prefererences are as follows:

    Display Aspect Ratio (DAR) = 5/4
    Storage Aspect Ratio (SAR) = 1/1
    Pixel Aspect Ratio (PAR) = 5/4

    The transcoded mpeg2 file gives the following aspect ratio preferences:

    Display Aspect Ratio (DAR) = 4/3
    Storage Aspect Ratio (SAR) = 16/15
    Pixel Aspect Ratio (PAR) = 5/4

    As a result, the transcoding process leads to a horizontally stretched and blurred pictures. Please have a look on the screenshots I have made.
    How can I overcome this problem? I just want to keep the movie file in the same shape but It should be compatible with the DVD-Video standard. Maybe it has something to do with the SAR value, right?

    I am using a trial version of Adobe Media Encoder CC for the transcoding process. Besides, I own the macOS app called "ff-works", which is a GUI environment for the open source command line tool "ffmpeg".

    Many thanks in advance and blessed holidays,
    Paul

    Image
    [Attachment 48761 - Click to enlarge]
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  2. I think this issue is a bit more complex than mp4 to DVD compliant file.

    What is your source? According to picture I think it might be VHS. What did you do to get the VHS video to your computer and post MediaInfo log (Text output) of your first file, the captured file.
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  3. Your source is obviously a 720x576 ITU cap that's encoded improperly as 5:4 DAR. It should be 4:3 DAR. Even so, AME did the conversion "properly", the way a professional DVD would be made from an ITU cap. The wider picture is how the original video was supposed to look.
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  4. Thanks for your replies!

    @Flashandpan007
    yes, This is digitised data from old VHS (PAL) tapes, by using a hardware h264 converter box (AverMedia Game Capture HDII).

    Als follows, the data from MediaInfo:

    1) from the h264 source file

    Code:
    Format                                   : MPEG-4
    Format profile                           : Base Media
    Codec ID                                 : isom (isom/iso2/avc1/mp41)
    File size                                : 169 MiB
    Duration                                 : 4mn 36s
    Overall bit rate                         : 5 136 Kbps
    Writing application                      : Lavf57.71.100
    
    Video
    ID                                       : 1
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : Main@L4.1
    Format settings                          : CABAC / 2 Ref Frames
    Format settings, CABAC                   : Yes
    Format settings, ReFrames                : 2 frames
    Codec ID                                 : avc1
    Codec ID/Info                            : Advanced Video Coding
    Duration                                 : 4mn 36s
    Bit rate                                 : 4 998 Kbps
    Width                                    : 720 pixels
    Height                                   : 576 pixels
    Display aspect ratio                     : 5:4
    Frame rate mode                          : Constant
    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)                       : 0.241
    Stream size                              : 165 MiB (97%)
    Codec configuration box                  : avcC
    
    Audio
    ID                                       : 2
    Format                                   : AAC LC
    Format/Info                              : Advanced Audio Codec Low Complexity
    Codec ID                                 : mp4a-40-2
    Duration                                 : 4mn 36s
    Bit rate mode                            : Constant
    Bit rate                                 : 128 Kbps
    Channel(s)                               : 2 channels
    Channel layout                           : L R
    Sampling rate                            : 48.0 KHz
    Frame rate                               : 46.875 fps (1024 SPF)
    Compression mode                         : Lossy
    Stream size                              : 4.21 MiB (2%)
    Default                                  : Yes
    Alternate group                          : 1

    2) from the transcoded mpeg2 DVD-Video file

    Code:
    Format                                  : MPEG-PS
    File size                                : 141 MiB
    Duration                                 : 4mn 36s
    Overall bit rate mode                    : Variable
    Overall bit rate                         : 4 274 Kbps
    
    Video
    ID                                       : 224 (0xE0)
    Format                                   : MPEG Video
    Format version                           : Version 2
    Format profile                           : Main@Main
    Format settings                          : BVOP
    Format settings, BVOP                    : Yes
    Format settings, Matrix                  : Default
    Format settings, GOP                     : M=2, N=12
    Format settings, picture structure       : Frame
    Duration                                 : 4mn 36s
    Bit rate mode                            : Variable
    Bit rate                                 : 3 997 Kbps
    Maximum bit rate                         : 9 000 Kbps
    Width                                    : 720 pixels
    Height                                   : 576 pixels
    Display aspect ratio                     : 4:3
    Frame rate                               : 25.000 fps
    Standard                                 : PAL
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Interlaced
    Scan order                               : Bottom Field First
    Compression mode                         : Lossy
    Bits/(Pixel*Frame)                       : 0.386
    Time code of first frame                 : 00:00:00:00
    Time code source                         : Group of pictures header
    GOP, Open/Closed                         : Open
    GOP, Open/Closed of first frame          : Closed
    Stream size                              : 132 MiB (94%)
    
    Audio
    ID                                       : 192 (0xC0)
    Format                                   : MPEG Audio
    Format version                           : Version 1
    Format profile                           : Layer 2
    Duration                                 : 4mn 36s
    Bit rate mode                            : Constant
    Bit rate                                 : 192 Kbps
    Channel(s)                               : 2 channels
    Sampling rate                            : 48.0 KHz
    Frame rate                               : 41.667 fps (1152 SPF)
    Compression mode                         : Lossy
    Stream size                              : 6.32 MiB (4%)

    @ jagabo
    This was also my initial thought, but the more I look at the results (I digitised about 30 tapes), the more I am convinced they are unnaturally stretched. Is there any method to check it?


    Cheers
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  5. Originally Posted by pauleck View Post
    I am convinced they are unnaturally stretched. Is there any method to check it?
    Find something of a known aspect ratio and measure it on screen. Like the tire of a car viewed directly from the side, a window of known dimensions, a photograph of a person in the video taken from the same angle, etc.

    But given the size of the black borders on the left and right of the frame, the half black line at the top of the frame and the head switching noise at the bottom, it's almost certain that you have an cap that conforms to the ITU spec.
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  6. Originally Posted by jagabo View Post
    Originally Posted by pauleck View Post
    I am convinced they are unnaturally stretched. Is there any method to check it?
    Find something of a known aspect ratio and measure it on screen. Like the tire of a car viewed directly from the side, a window of known dimensions, a photograph of a person in the video taken from the same angle, etc.
    Sounds logical
    It should also be fine to compare the orginal tape footage on my TV with the captured one?
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  7. Originally Posted by pauleck View Post
    It should also be fine to compare the orginal tape footage on my TV with the captured one?
    Maybe. If you're using a modern fixed pixel display (LCD, plasma, OLED) it should be ok. But old CRTs are usually out of spec as far as aspect ratios are concerned.
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  8. Originally Posted by jagabo View Post
    Originally Posted by pauleck View Post
    It should also be fine to compare the orginal tape footage on my TV with the captured one?
    Maybe. If you're using a modern fixed pixel display (LCD, plasma, OLED) it should be ok. But old CRTs are usually out of spec as far as aspect ratios are concerned.
    Should be fine, I own a 65" Panasonic TX-65DXW904 LCD TV from 2017

    I will report the results later on..
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