[FFmpeg-user] Subtitle stream added to QT MOV format even when -snswitch used

[bouke]

----- Original Message ----- 
From: "Evan Scanlan" <evan.m.scanlan at gmail.com>
To: "FFmpeg user questions and RTFMs" <ffmpeg-user at ffmpeg.org>
Sent: Saturday, August 13, 2011 8:20 PM
Subject: Re: [FFmpeg-user] Subtitle stream added to QT MOV format even 
when -snswitch used


> On Sat, Aug 13, 2011 at 1:20 PM, bouke <bouke at editb.nl> wrote:
>> ----- Original Message -----
>> From: "Evan Scanlan" <evan.m.scanlan at gmail.com>
>> To: <ffmpeg-user at ffmpeg.org>
>> Sent: Saturday, August 13, 2011 7:00 PM
>> Subject: [FFmpeg-user] Subtitle stream added to QT MOV format even
>> when -snswitch used
>>
>>
>>> Hi,
>>>
>>> Apologies if this has been posted/solved elsewhere… I searched and did
>>> not find this particular issue. Also, I tried to post this last night
>>> and it did not seem to go through -- sorry if this is a double-post.
>>>
>>> I am using FFMPEG to encode from an Matroska video (mkv) to a
>>> Quicktime mov file. Problem is that mov file includes subtitle stream
>>> even when -sn switch is used. This occurs with both the Fedora 12
>>> current packaged binary (ffmpeg-0.7-45_rc1.fc12.x86_64) and with a
>>> build from GIT source (about one month old). It also happens when
>>> using the MacPorts FFMPEG. This does not seem to be a problem when
>>> converting from other file formats to mov (e.g. m2ts to mov)
>>>
>>> Here is a little example using the precompiled binary Fedora package.
>>> The second time I run ffmpeg the subtitle stream appears even though
>>> conversion was run with -sn the first time.
>>>
>>> Any help or suggestions would be much appreciated.
>>
>> Not sure what and why, but does the metadata (aka text aka subtitle 
>> stream)
>> bother you?
>
>
> Thanks for the response!
>
> It mainly bothers me because it makes it so that Quicktime cannot
> manipulate the file.  So I cannot save the file from Quicktime nor can
> I use other programs like iFlicks (which I think uses Quicktime API)
> when the subtitle stream is present.  On other converted mov
> containers (without subtitle stream) iFlicks and Quicktime work fine.

This i don't understand.
A subtitle track should be a custom formatted text file pasted in QT,
has nothing to do with Quicktime being able to manipulate the file or not.
(actually, QT player can be used to strip the track...)
No idea about QT on Linux though, but this is the case on Win and Mac.

>> (i mean, does it show on playback?)
>> If so, can't you get rid of it in the second pass with mapping? (it 
>> appears
>> as a seperate stream...)
>> (or perhaps map the first pass, or pipe the second pass...)
>
> I tried that... running on the mov file again with -vocdec copy
> -acodec copy -sn -f mov ... does not get rid of the subtitle stream.
> It stays there and I cannot get rid of it no matter what I have tried.
> Any suggestions on how to trick ffmpeg into removing the stream would
> be great!

Well, did you try -map instead of -sn ?

Bouke


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