Hi Diogo,
I've actually made some headway with this and I tested with the same
version on ffmpeg on a local desktop linux system and a remote linux
server. I still get very different results, which again leads me to believe
there is some hardware bias that's happening.
If anybody has any thoughts about this, I'll appreciate it.
Thanks
R
Ron Ganbar
email: ron...@gmail.com
tel: +44 (0)7968 007 309 [UK]
+972 (0)54 255 9765 [Israel]
url: http://ronganbar.wordpress.com/
On Mon, Apr 20, 2015 at 3:50 PM, Diogo Girondi <diogogiro...@gmail.com>
wrote:
> I think the problem is with the different ffmpeg versions, there some
> considerable changes on how things are handled between 2.0 and 2.6. Have
> you tried the 2.6.32 on Linux to check if there still significant
> differences?
>
> v 2.0.6
>
> libavutil 52. 38.100
> libavcodec 55. 18.102
> libavformat 55. 12.100
> libavdevice 55. 3.100
> libavfilter 3. 79.101
> libavresample 1. 1. 0
> libswscale 2. 3.100
> libswresample 0. 17.102
> libpostproc 52. 3.100
>
> v 2.6.2
>
> libavutil 54. 20.100
> libavcodec 56. 26.100
> libavformat 56. 25.101
> libavdevice 56. 4.100
> libavfilter 5. 11.102
> libavresample 2. 1. 0
> libswscale 3. 1.101
> libswresample 1. 1.100
> libpostproc 53. 3.100
>
> They've changed a lot between the two, specially when it comes to the
> libav.
>
>
> Cheers,
> Diogo
>
>
> On Mon, Apr 20, 2015 at 8:31 AM, Ron Ganbar <ron...@gmail.com> wrote:
>
>> Hi there Diogo,
>> It's all different, actually.
>> Locally I'm testing on Windows with a standard compile of the latest
>> ffmpeg for windows v2.6.2.
>> On the server we're running Linux and we compiled ffmpeg ourselves from
>> the v2.0 sources.
>> We are not specifying any hardware acceleration.
>>
>> This is the command:
>> ffmpeg -y -i source.flv -vprofile baseline -preset superfast -vcodec
>> libx264 -vb 1600k -minrate 1600k -maxrate 1600k -bufsize 3835k -s 640x360
>> -movflags faststart destination.mp4
>>
>> I thought that independant on the hardware, unless specified otherwise,
>> ffmpeg gives the same result. Am I wrong?
>>
>> Thanks
>>
>>
>>
>>
>> Ron Ganbar
>> email: ron...@gmail.com
>> tel: +44 (0)7968 007 309 [UK]
>> +972 (0)54 255 9765 [Israel]
>> url: http://ronganbar.wordpress.com/
>>
>> On Mon, Apr 20, 2015 at 2:02 PM, Diogo Girondi <diogogiro...@gmail.com>
>> wrote:
>>
>>> Hi Ron,
>>>
>>> I don't have much experience with ffmpeg so I doubt I will be of much
>>> help. But, are the cpus of both machines from different brands?
>>>
>>> Is the server's OS different from the one you're using on your computer?
>>>
>>> Are you using hardware acceleration on ffmpeg?
>>>
>>> Is the ffmpeg version the same on both computers?
>>>
>>>
>>> cheers,
>>> Diogo
>>>
>>> On Mon, Apr 20, 2015 at 6:31 AM, Ron Ganbar <ron...@gmail.com> wrote:
>>>
>>>> Hi all,
>>>> I'm using ffmpeg to encode some video. When I run the command locally I
>>>> get a very different result than when I run the same command on the same
>>>> source on a server.
>>>> Somebody told me that ffmpeg might change the bit rate or some other
>>>> quality switch based on the environment it's running on. More specifically,
>>>> that it can read what processor it has and make quality decisions based on
>>>> that - and that this might be the reason for the change.
>>>> I can't find anything in the documentation about this.
>>>> Anybody has insight on this odd behavior?
>>>>
>>>> Thanks,
>>>> Ron Ganbar
>>>> email: ron...@gmail.com
>>>> tel: +44 (0)7968 007 309 [UK]
>>>> +972 (0)54 255 9765 [Israel]
>>>> url: http://ronganbar.wordpress.com/
>>>>
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