[FFmpeg-user] libx264 options through FFmpeg

[Tim Nicholson]

On 28/06/11 17:51, Thomas Worth wrote:
> On Tue, Jun 28, 2011 at 8:31 AM, Tim Nicholson<tim.nicholson at bbc.co.uk>  wrote:
>> On 22/06/11 06:43, Thomas Worth wrote:
>>>
>>> While I've historically used a standalone x264 binary to do encoding
>>> by piping yuv420p from FFmpeg, I thought I'd try libx264 through
>>> FFmpeg since it's certainly more convenient.
>>>
>>> [....]
>>>
>>> If I can safely pass all my options via -x264opts then I'll just use
>>> that from now on and disregard FFmpeg's x264 interface.
>>
>> But what about options that require colon delimited parameters themselves
>> such as "--sar 1:1"?
>
> If I use a forward slash (sar=16/9), libx264 doesn't complain but it
> also doesn't use the supplied ratio. It seems to default to "1/1"
> every time.

I have tried sar="1:1" and it hasn't complained about that.

Howver it doesn't want to accept a profile specification. Using:-

ffmpeg -i  $in_file -vcodec libx264 -pix_fmt yuv420p -s 1920x1080 -an \
-x264opts bitrate=35000:preset=veryslow:tune=$tune:\
[...]

I get a:-
"[libx264 @ 0x12e0960] bad value for 'preset': 'veryslow'"

error. replace "veryslow" with whatever you like from the legal list.

-- 
Tim

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