[FFmpeg-user] I am unable to get ffmpeg to calculate PSNR for any video files.

[Reed Crowe]

Gyan,
Wow, thank you for that. I had no idea what inf meant. I just assumed it
wasn't working!
I appreciate you taking the time to help me out.
Thank you.

On Tue, Jan 19, 2021 at 10:18 AM Gyan Doshi <ffmpeg at gyani.pro> wrote:

>
>
> On 19-01-2021 10:38 pm, Reed Crowe wrote:
> > Still does not work.
> > With this command:
> > ffmpeg -i /home/rcrowe/LVT/17647_20210118_195325.mp4 -i
> > /home/rcrowe/LVT/test.mp4 -enc_time_base -1 -filter_complex psnr -f null
> -
> > I get the same results:
> > ffmpeg version N-100671-gc48110a4a4 Copyright (c) 2000-2021 the FFmpeg
> > developers
> >    built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
> >    configuration:
> >    libavutil      56. 63.101 / 56. 63.101
> >    libavcodec     58.117.101 / 58.117.101
> >    libavformat    58. 65.101 / 58. 65.101
> >    libavdevice    58. 11.103 / 58. 11.103
> >    libavfilter     7. 96.100 /  7. 96.100
> >    libswscale      5.  8.100 /  5.  8.100
> >    libswresample   3.  8.100 /  3.  8.100
> > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> > '/home/rcrowe/LVT/17647_20210118_195325.mp4':
> >    Metadata:
> >      major_brand     : isom
> >      minor_version   : 512
> >      compatible_brands: isomiso2avc1mp41
> >      title           : 'LVT17647'
> >      encoder         : Lavf58.20.100
> >    Duration: 00:00:59.87, start: 0.000000, bitrate: 67 kb/s
> >      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661),
> yuvj420p(pc,
> > bt470bg/bt470bg/bt709), 704x480, 66 kb/s, 15.03 fps, 15 tbr, 90k tbn,
> 180k
> > tbc (default)
> >      Metadata:
> >        handler_name    : VideoHandler
> >        vendor_id       : [0][0][0][0]
> > Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/home/rcrowe/LVT/test.mp4':
> >    Metadata:
> >      major_brand     : isom
> >      minor_version   : 512
> >      compatible_brands: isomiso2avc1mp41
> >      title           : 'LVT17647'
> >      encoder         : Lavf58.20.100
> >    Duration: 00:00:59.87, start: 0.000000, bitrate: 67 kb/s
> >      Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661),
> yuvj420p(pc,
> > bt470bg/bt470bg/bt709), 704x480, 66 kb/s, 15.03 fps, 15 tbr, 90k tbn,
> 180k
> > tbc (default)
> >      Metadata:
> >        handler_name    : VideoHandler
> >        vendor_id       : [0][0][0][0]
> > Stream mapping:
> >    Stream #0:0 (h264) -> psnr:main
> >    Stream #1:0 (h264) -> psnr:reference
> >    psnr -> Stream #0:0 (wrapped_avframe)
> > Press [q] to stop, [?] for help
> > [null @ 0x559c3fc0d6c0] Input stream data not available, using default
> time
> > base
> > Output #0, null, to 'pipe:':
> >    Metadata:
> >      major_brand     : isom
> >      minor_version   : 512
> >      compatible_brands: isomiso2avc1mp41
> >      title           : 'LVT17647'
> >      encoder         : Lavf58.65.101
> >      Stream #0:0: Video: wrapped_avframe, yuvj420p(pc,
> > bt470bg/bt470bg/bt709, progressive), 704x480, q=2-31, 200 kb/s, 15 fps,
> 15
> > tbn (default)
> >      Metadata:
> >        encoder         : Lavc58.117.101 wrapped_avframe
> > *[null @ 0x559c3fc0d6c0] Application provided invalid, non monotonically
> > increasing dts to muxer in stream 0: 748 >= 748*
> > frame=  899 fps=0.0 q=-0.0 Lsize=N/A time=00:00:59.86 bitrate=N/A
> > speed=79.3x
> > video:471kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> > muxing overhead: unknown
> > *[Parsed_psnr_0 @ 0x559c3fe87bc0] PSNR y:inf u:inf v:inf average:inf
> > min:inf max:inf*
>
> The results are right above, on the last line.  'inf' is infinity
> meaning the two inputs are identical.
>
> Regards,
> Gyan
>
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