[FFmpeg-devel] [PATCH] avformat/yuv4mpegdec: increase header limit

[Paul B Mahol]

On 10/20/22, Chema Gonzalez <chemag at gmail.com> wrote:
> From: Chema Gonzalez <chemag at fb.com>
>
> Allows demuxing UHD F1000000000:33333333 fps yuvj420p files
>
> ffmpeg (at HEAD as of now) is creating this:
>
> ```
> $ ffmpeg -y -i source.265 /tmp/foo.y4m >& /dev/null
> ...
> $ xxd /tmp/raw.y4m |less
> 00000000: 5955 5634 4d50 4547 3220 5731 3932 3020  YUV4MPEG2 W1920
> 00000010: 4831 3038 3020 4631 3030 3030 3030 3030  H1080 F100000000
> 00000020: 303a 3333 3333 3333 3333 2049 7020 4130  0:33333333 Ip A0
> 00000030: 3a30 2043 3432 306d 7065 6732 2058 5953  :0 C420mpeg2 XYS
> 00000040: 4353 533d 3432 304d 5045 4732 2058 434f  CSS=420MPEG2 XCO
> 00000050: 4c4f 5252 414e 4745 3d4c 494d 4954 4544  LORRANGE=LIMITED
> 00000060: 0a46 5241 4d45 0a82 8282 8282 8282 8282  .FRAME..........
> ...
> ```
>
> Which cannot be parsed by the same ffmpeg decoder:
> ```
> $ ffmpeg -i /tmp/foo.y4m /tmp/bar.y4m
> ...
> [yuv4mpegpipe @ 0x2b69a40] Header too large.
> /tmp/foo.y4m: Invalid argument
> ```
>
> This is kicking the ball (per 0b1ff3265e9bdad3b4b6b97ced2f126cb3599568),
> but seems to work.
> ---
>  libavformat/yuv4mpegdec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavformat/yuv4mpegdec.c b/libavformat/yuv4mpegdec.c
> index b24275acc1..c0972af7de 100644
> --- a/libavformat/yuv4mpegdec.c
> +++ b/libavformat/yuv4mpegdec.c
> @@ -27,7 +27,7 @@
>  #include "yuv4mpeg.h"
>
>  /* Header size increased to allow room for optional flags */
> -#define MAX_YUV4_HEADER 96
> +#define MAX_YUV4_HEADER 128
>  #define MAX_FRAME_HEADER 80
>
>  static int yuv4_read_header(AVFormatContext *s)
> --
> 2.37.3
>



will apply soon.

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