[FFmpeg-user] -crf ignored

[Paul Gardiner]

On 02/06/2011 16:38, Baptiste Coudurier wrote:
> 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.

I'm hoping to deal with interlaced content (recompressing as interlaced
if possible). I was assuming interlaced content was sent in whole
frames. Is that not right?

> Also, you are losing the sync engine when encoding video separately.

Is that true also for using ffmpeg with the source coming from two
pipes? I did wonder if sync could be a problem.

Paul.