[FFmpeg-user] High Quality WEBM

Reindl Harald h.reindl at thelounge.net
Tue Dec 22 21:18:42 CET 2015

Am 22.12.2015 um 21:10 schrieb jd1008:
> 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" ...

why would you need to provide the input sclase

> and for output provide -vf 'scale=1920:1080' ?
> Really confused now.

about what?

> 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

you just need to play around with the bitrate
especially when you upsacle
-vf is *not* about the bitrate

step back to my first response and look at the other params too

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