[FFmpeg-user] -crf ignored

[Baptiste Coudurier]

On 06/02/2011 05:47 AM, Paul Gardiner wrote:
> On 02/06/2011 00:48, Thomas Worth wrote:
>> On Wed, Jun 1, 2011 at 4:33 PM, Baptiste Coudurier<
>>> Piping produces all sort of side-effects, I don't recommend it at all.
>>> Plus, the new features should be added fairly quickly.
>>
>>
>> Can you elaborate? My first thought would be a performance penalty,
>> but does
>> piping differ any from simply dumping yuv420 to disk and then encoding
>> the
>> raw yuv file with x264?
> 
> I'm also interested to know what problems use of pipes might lead to.
> My target application is to use ffmpeg to compress movies from mythtv
> which are passed via a pair of pipes, one for audio, one for video.

Interlacing information not kept across the pipe for example.
Also, you are losing the sync engine when encoding video separately.

-- 
Baptiste COUDURIER
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