[FFmpeg-user] High Quality WEBM
jd1008 at gmail.com
Tue Dec 22 21:10:55 CET 2015
On 12/22/2015 12:46 PM, Reindl Harald wrote:
> Am 22.12.2015 um 20:41 schrieb jd1008:
>> On 12/22/2015 12:32 PM, Reindl Harald wrote:
>>>> I would like to add
>>>> -s '1920x1080'
>>> how does 1920x1080 makes sense when your destination size is 320x180?
>> So, would changing
>> -vf 'scale=320:176,setdar=16/9,pad=320:180:0:2:000000'
>> -vf 'scale=1920:1080'
>> be enough to get full HD resolution, or would that make the image lose
>> clarity, definition and sharpness??
> yes, if the inout format is Ok
> "-vf 'scale=320:176,setdar=16/9,pad=320:180" make black borders on the
> correct sides and si calculated by the script generating the
> ffmoeg-call because to have exactly 320x180 on a website from the
> input file used you need them
Sorry Reindl, I lost you.
Do I understand I still need to provide the input scale, of "-vf
and for output provide -vf 'scale=1920:1080' ?
Really confused now.
I have a vid that is of lower scale and need to expand it to 1920x1080
and hopefully not ruin the definition, sharpness ... etc too much.
Video input is (per ffplay):
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p,
640x360 [SAR 1:1 DAR 16:9], 278 kb/s, 29.97 fps, 29.97 tbr, 90k tbn,
59.94 tbc (default)
and mplayer reports:
VIDEO: [H264] 640x360 24bpp 29.970 fps 278.1 kbps (33.9 kbyte/s)
So I would obviously need to increase the bitrate but not sure to what,
nor am I sure if I need to specify what the input 'vf' values are and
then provide the output vf values.
More information about the ffmpeg-user