Itouch mp4 settings

[Don Rossie]

Hi,
Thanks for your reply Andy and the attached information.

Am I right in saying that after I run get_iplayer and it has downloaded the
video file from iplayer, it then has a second stage of where it converts it
to a mp4 file from a flv file by using ffmpeg ?

This is my command line and I don't refer to ffmpeg anywhere so I assuming
that it is built into get_iplayer:

get_iplayer --type=tv --get 130 --modes=iphone,flashstd,flashnormal

When the file had downloaded, it still won't work on itunes !!!

The last thing I want to be is a pain, but my pain is not being able to get
my favourite bbc progs onto my itouch.

Any help will be greatly appreciated.

Cheers
Don...



-----Original Message-----
From: get_iplayer-bounces at lists.infradead.org
[mailto:get_iplayer-bounces at lists.infradead.org] On Behalf Of Andy
Bircumshaw
Sent: 24 December 2010 12:32
To: get_iplayer at lists.infradead.org
Subject: Re: Itouch mp4 settings

This list really isn't the place to address ffmpeg problems.

I am not an expert on transcoding - that's just the kind of thing I'll avoid
at all costs, if possible.

Better to join the ffmpeg list and ask there.

However, a couple of comments below:


On 24/12/2010, at 10:43am, Don Rossie wrote:
> ...
> I am afraid that I am getting to the end of my tether with this problem of
> itouch recordings.
> 
> I have tried ffmpeg with the following settings:
> 
> For one pass:
> 
> ffmpeg -i INPUT -acodec libfaac -ab 128k -s WIDTHxHEIGHT -vcodec libx264
> -vpre slow -vpre ipod640 -b BIT_RATE -aspect WIDTH:HEIGHT -threads 0 -f
ipod
> OUTPUT.mp4
> 
> When I run this I get the error saying that it can't find the preset
"slow".

This looks to me like you're specifying the slow preset and then overriding
it with the ipod640 preset, anyway.

What happens if you remove the "-vpre slow"? 

> I have tried putting the 'libx264-slow.ffpreset' into root of the ffmpeg
> directory, renaming it slow and renaming it to slow and putting it back
into
> the ffmpeg presets directory.

man ffmpeg says:

       Preset files are specified with the "vpre", "apre", "spre", and
"fpre"
       options. The "fpre" option takes the filename of the preset instead
of
       a preset name as input and can be used for any kind of codec. For the
       "vpre", "apre", and "spre" options, the options specified in a preset
       file are applied to the currently selected codec of the same type as
       the preset option.
 

       The argument passed to the "vpre", "apre", and "spre" preset options
       identifies the preset file to use according to the following rules:
 

       First ffmpeg searches for a file named arg.ffpreset in the
directories
       $FFMPEG_DATADIR (if set), and $HOME/.ffmpeg, and in the datadir
defined
       at configuration time (usually PREFIX/share/ffmpeg) in that order.
For
       example, if the argument is "libx264-max", it will search for the
file
       libx264-max.ffpreset.

 

       If no such file is found, then ffmpeg will search for a file named
       codec_name-arg.ffpreset in the above-mentioned directories, where

       codec_name is the name of the codec to which the preset file options
       will be applied. For example, if you select the video codec with
       "-vcodec libx264" and use "-vpre max", then it will search for the
file
       libx264-max.ffpreset.

> As this didn't work, I tried FFE with all of the Vob to h264+AAC preset
and
> get the following error message:
> 
> [NULL @ 003f3c80] [Eval @ 0022fa78] Invalid chars 'v' at the end of
> expression '4mv'
> [NULL @ 003f3c80] Unable to parse option value "4mv+trell+aic+umv+qpel"
> Invalid value '+4mv+trell+aic+umv+qpel' for option 'flags'
> 
> If you can offer any further help, I would be very grateful

That looks like the .ffpreset file contains dodgy characters. Could it be
corrupt? What platform are you using? If on Windows, could it contain the
"wrong kind" of line-feed characters?

aB.



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