[Ffmpeg-devel] bug report: ffmpeg converting error - AVI to MP4

[Kostya]

On Tue, Feb 20, 2007 at 01:33:41PM +0100, Michael Niedermayer wrote:
> Hi
> 
> On Mon, Feb 19, 2007 at 08:31:34AM +0200, Kostya wrote:
> > On Sun, Feb 18, 2007 at 11:06:20AM -0800, Jimmy wrote:
> > > Hello.
> > > 
> > > I am trying convert from AVI to MP4.
> > > The codecs I use for AVI are:
> > >     - video: PicVideo M-JPEG
> > >     - audio: PCM 44.1kHz, 16 bit, stereo
> > > 
> > > The convertion process goes smoothly for a while and at a point ffmpeg starts returning alot of errors.
> > > The most common is "[mjpeg @ 0x840fbc0]Subsampling in JPEG-LS is not supported."
> > > >From the time the error occurs the resulted MP4 has white image frames.
> > > I am recording with iuVCR v. 4.7.4.293.
> > 
> > This codec violates JFIF format.
> > 
> > Those pictures which are almost correct are missing huffman table 0x00
> > (ancient FFmpeg build 4747 handles them correctly, new FFmpeg and
> > libjpeg-based programs could not handle them at all).
> 
> does 4747 work and 4748 fail?

Sorry, my mistake - current SVN works too. 

> and yes picvideo mjpeg should be supported, no matter if they violate the
> standards or not

Supported frames are decoded correctly but some frames are quite strange.
For example, look at frame 323.
 
> [...]
> -- 
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
> 
> Why not whip the teacher when the pupil misbehaves? -- Diogenes of Sinope