[FFmpeg-user] High Quality WEBM

jd1008 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'
>> to
>> -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 
'scale=320:176,setdar=16/9,pad=320:180" ...
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.

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