create MPEG2 compatible with PS3 ?

With MythTV, I capture HD programs as MPEG2 TS. Then, using the UPnP 
server built into MythTV, I try to stream the video files to the PS3.

The problem is, the PS3 does not accept the AC3 audio codec under these 
conditions (streaming MPEG2 from a network server), and many HD programs 
are transmitted with AC3. So I try to convert the audio track to MP2 
using ffmpeg. First, I tried this:

ffmpeg -i in.mpg -vcodec copy -ab 256kb -acodec mp2 out.mpg

But that generated a lot of "buffer underflow" and "packet too large" 
messages, so I stopped it. Then I tried this:

ffmpeg -i in.mpg -vcodec copy -ab 256kb -acodec mp2 -f mpegts out.mpg

That didn't generate any apparent errors. I rebuilt the mythtv seektable 
using mythcommflag, then tried to stream the new file to the PS3.

This time the audio track works. However, once every 1...2 seconds 
there's a loud "squeak". Eventually, the PS3 quits playing with an error.
I tried to further process the mpegts file using mythtranscode, just do 
a demux/remux like this:

mythtranscode -m -e dvd -p autodetect

First off, mythtranscode doesn't like the ffmpeg-generated mpegts very 
much. It gives many messages like this:

2008-04-01 00:24:29.746 Frame 15 > 14. Corruption likely at pos: 12544121400
2008-04-01 00:24:31.109 Frame 17 > 16. Corruption likely at pos: 12562632256

Re: create MPEG2 compatible with PS3 ?

Florin Andrei wrote:
> 
> The original capture file plays just fine in MythTV.

On the PS3, the original file has no sound, of course, but the video is 
smooth, there is no "shuddering" - that's introduced, apparently, after 
running ffmpeg.

--

-- 
Florin Andrei

http://florin.myip.org/

Subtitle Stream

Hi,

if i use the command "ffmpeg.exe -i VTS_01_2.VOB -map 0:5 -an -vn -scodec
copy -f vob test.sub" i can get the subtitles stream from a Vob file but is
there anyway to convert this to a ASCII file like .srt?

Best Regards
--

-- 
Gonçalo

Re: Subtitle Stream

On Tue, 1 Apr 2008 10:34:04 +0100, "Gonçalo Gomes" <goncalomg <at> gmail.com>
wrote:

> if i use the command "ffmpeg.exe -i VTS_01_2.VOB -map 0:5 -an -vn -scodec
> copy -f vob test.sub" i can get the subtitles stream from a Vob file but
> is there anyway to convert this to a ASCII file like .srt?

You'd probably be better off using spuunmux (part of DVDauthor), which will
extract a bunch of bitmap files for you (subtitles *are* rendered into
bitmap format before injection into the SPU stream) and then feeding them
through an OCR application.

--

-- 
G. Stewart - gstewart <at> lamproie.eu

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Re: Subtitle Stream

>
>
> You'd probably be better off using spuunmux (part of DVDauthor), which
> will
> extract a bunch of bitmap files for you (subtitles *are* rendered into
> bitmap format before injection into the SPU stream) and then feeding them
> through an OCR application.
>
> --
> G. Stewart - gstewart <at> lamproie.eu
>

Is there no other way? like only using ffmpeg?

Cheers
--

-- 
Gonçalo

Re: Subtitle Stream

On Tue, 1 Apr 2008 11:08:08 +0100, "Gonçalo Gomes" <goncalomg <at> gmail.com>
wrote:

> > You'd probably be better off using spuunmux (part of DVDauthor)...
> 
> Is there no other way? like only using ffmpeg?

If there is, I'd like to know it!

--

-- 
G. Stewart - gstewart <at> lamproie.eu

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Re: Subtitle Stream

On date Tuesday 2008-04-01 11:12:32 +0100, Godwin Stewart encoded:
> On Tue, 1 Apr 2008 11:08:08 +0100, "Gonçalo Gomes" <goncalomg <at> gmail.com>
> wrote:
> 
> > > You'd probably be better off using spuunmux (part of DVDauthor)...
> > 
> > Is there no other way? like only using ffmpeg?
> 
> If there is, I'd like to know it!

New libavfilter API (whose inclusion in ffmpeg SVN isn't yet complete)
should permit to write a filter to output the content of the scodec
frames.

Also I think it should be possible to do it right now programmatically
using libavformat and accessing the data of each subtitle frame.

HTH, regards.
--

-- 
ffmpeg-user random tip #10
One minute of pure noise with ffmpeg:
ffmpeg -ar 48000 -t 60 -f s16le -acodec pcm_s16le -i /dev/urandom  \
    -ab 64K -f mp2 -acodec mp2 -y noise.mp2

Re: Subtitle Stream

Gonçalo Gomes wrote:
>> You'd probably be better off using spuunmux (part of DVDauthor), which
>> will
>> extract a bunch of bitmap files for you (subtitles *are* rendered into
>> bitmap format before injection into the SPU stream) and then feeding them
>> through an OCR application
>
> Is there no other way? like only using ffmpeg?
>   

No, and I think it is unlikely that ffmpeg will be able to convert dvd 
subtitles (which are images put over the video) to text, since it's a 
video converting (and muxing/demuxing, etc) tool, not an OCR program.

--

-- 
Simulated picture.

Eduardo M KALINOWSKI
ekalin <at> gmail.com
http://move.to/hpkb

Re: Converting avi files to animated gifs [PATCH]

Michel Bardiaux wrote:
> Baptiste Coudurier wrote:
>> Michel Bardiaux wrote:
>>> Baptiste Coudurier wrote:
>>> [...]
>>>
>>>>> (This is a general problem in lavf, it is very weak on knowledge of 
>>>>> which codec is acceptable or recommended for what muxer).
>>>> Lavf is premissive in many regards, this was the way things were used to
>>>> be, and IMHO this is one of its advantages, since it let 'aware' people
>>>> using it in many ways.
>>>>
>>>> I personally wouldn't like lavf being aggressive.
>>> And everyone could have what he wishes, that's why there is -strict 
>>> strictness  how strictly to follow the standards, no? You like to run 
>>> permissive, I prefer aggressive, ffmpeg should be able to do both.
>> Again feel free to submit patch which add strictness when -strict is
>> actually used, but this would not change the default.
> 
> General case: I agree. But here: the muxer wont work at all with the 
> wrong codec and/or pix_fmt, so the check must always be done.

And here is the patch. OK?

> 
>>>> See the agsm problem lately, this is again IMHO a bit useless wasted time.
>>> And I explained there that my desire to produce some message is 
>>> basically a defense against users attempting to change the bitrate then 
>>> pestering the list because it doesnt work.
>> Yes, and now I'd like your check being done when stricness is explicitly

Problem when encoding mjpeg video with rgb555 pixel format

Hello all,

I'm trying to convert mpeg video to mjpeg with rbg555 . ( Sorry if it is an
often asked question )

Ffmpeg version : "SVN-r11553" , 2008-01-18-win32

I exec the command line :
./ffmpeg -i entryVideo.avi -vcodec mjpeg -pix_fmt rgb555 -s 640x480
jlr_640x480_mjpeg.avi
While converting, I have a trace telling that the format used for the output
will be yuv...

When I try to read the output_1280x480.avi video with mplayer , I get in the
debug console :

Playing
D:\mplayer\ffmpeg\ffmpeg-export-2008-01-18-win32\jlr_640x480_mjpeg.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
AVI: No audio stream found -> no sound.
VIDEO:  [MJPG]  640x480  24bpp  25.000 fps  3471.9 kbps (423.8 kbyte/s)
Clip info:
 Software: Lavf52.4.0
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffmjpeg] vfm: ffmpeg (FFmpeg MJPEG decoder)
==========================================================================
Audio: no sound
Starting playback...