[FFmpeg-user] Setting the fps on a WMV

[Lou]

See inline replies.

On Wed, 1 Aug 2012 15:16:56 -0700 (PDT)
johlaf <john.lafferty at awm.gov.au> wrote:

> Hope this helps :)
> 
> D:\dev_WMV>ffmpeg -i file.MXF -r 25 -vcodec wmv2 -qscale 4 -vf
> "scale=-1:288" -y file.wmv
> ffmpeg version N-41975-gb536e2f Copyright (c) 2000-2012 the FFmpeg
> developers
>   built on Jun 26 2012 20:37:12 with gcc 4.7.1
>   configuration: --enable-gpl --enable-version3 --disable-w32threads
> --enable-runtime-cpudetect --enable-avisynth --enab
> le-bzlib --enable-frei0r --enable-libass --enable-libcelt
> --enable-libopencore-amrnb --enable-libopencore-amrwb --enable
> -libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut
> --enable-libopenjpeg --enable-librtmp --enable-libschro
> edinger --enable-libspeex --enable-libtheora --enable-libutvideo
> --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-
> libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid
> --enable-zlib
>   libavutil      51. 63.100 / 51. 63.100
>   libavcodec     54. 29.101 / 54. 29.101
>   libavformat    54. 11.100 / 54. 11.100
>   libavdevice    54.  0.100 / 54.  0.100
>   libavfilter     3.  0.100 /  3.  0.100
>   libswscale      2.  1.100 /  2.  1.100
>   libswresample   0. 15.100 /  0. 15.100
>   libpostproc    52.  0.100 / 52.  0.100
> Guessed Channel Layout for  Input Stream #0.1 : mono
> Guessed Channel Layout for  Input Stream #0.2 : mono
> Input #0, mxf, from 'file.MXF':
>   Metadata:
>     timecode        : 09:01:29:24
>   Duration: 00:01:15.76, start: 0.000000, bitrate: 30516 kb/s
>     Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3], 25
> fps, 25 tbr, 25 tbn, 25 tbc

Your input is already 25 fps. FFmpeg will attempt to inherit the input
frame rate for the output if possible.

>     Stream #0:1: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
>     Stream #0:2: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Please use -q:a or -q:v, -qscale is ambiguous

This is telling you to use -qscale:v or -q:v (same thing, just shorter).

> [graph 0 input from stream 0:0 @ 00000000003fdd00] w:720 h:576
> pixfmt:yuv420p tb:1/25 fr:25/1 sar:16/15 sws_param:flags=
> 2
> [output stream 0:0 @ 00000000003fde20] No opaque field provided
> [Parsed_scale_0 @ 00000000003fdc60] w:720 h:576 fmt:yuv420p sar:16/15 ->
> w:360 h:288 fmt:yuv420p sar:16/15 flags:0x4
> [graph 1 input from stream 0:1 @ 00000000003fdf40] tb:1/25 samplefmt:s16
> samplerate:48000 chlayout:0x4
> Output #0, asf, to 'file.wmv':
>   Metadata:
>     timecode        : 09:01:29:24
>     WM/EncodingSettings: Lavf54.11.100
>     Stream #0:0: Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 360x288 [SAR
> 16:15 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 25 tbc

This looks like 25 to me.

>     Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 48000 Hz, mono, s16,
> 127 kb/s
> Stream mapping:
>   Stream #0:0 -> #0:0 (dvvideo -> wmv2)
>   Stream #0:1 -> #0:1 (pcm_s16le -> wmav2)
> Press [q] to stop, [?] for help
> frame= 1894 fps=243 q=4.0 Lsize=   11629kB time=00:01:15.72
> bitrate=1258.2kbits/s
> video:10154kB audio:1183kB subtitle:0 global headers:0kB muxing overhead
> 2.584494%

Why do you think that the output is 30 fps? What player are you using?

> --
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