why use DIVX instead of FMP4 in AVI muxer

[Carlos Rafael Giani]

My guess would be that "DIVX" is much more common and more widely 
supported than "FMP4". In fact, I usually cannot playback files with the 
"FMP4" fourcc in Windows (unless I use the ffdshow plugins, VLC, or 
MPlayer).

On 2013-04-22 10:00, Song Bing-B06498 wrote:
>
> Hi buddies,
>
> Do someone know the reason?
>
> Regards,
>
> Song Bing.
>
> *From:*Song Bing-B06498
> *Sent:* Friday, April 12, 2013 11:19 AM
> *To:* 'gstreamer-devel at lists.freedesktop.org'
> *Subject:* why use DIVX instead of FMP4 in AVI muxer
>
> Hi,
>
> When I test AVI muxer. The video input is MPEG4 stream. Found AVI 
> muxer will treat MPEG4 video as DIVX. As our platform haven't DIVX 
> decoder, we can't playback the muxed file. Why use DIVX instead of 
> FMP4? Our platform has MPEG4 decoder, if set FOURCC to FMP4 and store 
> codec data in file header, we can playback the muxed file.
>
> 579     } else if (!strcmp (mimetype, "video/mpeg")) {
>
>  580       gint mpegversion;
>
>  581
>
>  582       gst_structure_get_int (structure, "mpegversion", 
> &mpegversion);
>
>  583
>
>  584       switch (mpegversion) {
>
>  585         case 2:
>
>  586           avipad->vids.compression = GST_MAKE_FOURCC ('M', 'P', 
> 'G', '2');
>
>  587 break;
>
>  588         case 4:
>
>  589           /* mplayer/ffmpeg might not work with DIVX, but with 
> FMP4 */
>
>  590           avipad->vids.compression = GST_MAKE_FOURCC ('D', 'I', 
> 'V', 'X');
>
>  591
>
>  592           /* DIVX/XVID in AVI store the codec_data chunk as part 
> of the
>
>  593              first data buffer. So for this case, we prepend the 
> codec_data
>
>  594              blob (if any) to that first buffer */
>
>  595           codec_data_in_headers = FALSE;
>
>  596           break;
>
>  597         default:
>
>  598           GST_INFO ("unhandled mpegversion : %d, fall back to 
> fourcc=MPEG",
>
>  599               mpegversion);
>
>  600           avipad->vids.compression = GST_MAKE_FOURCC ('M', 'P', 
> 'E', 'G');
>
>  601 break;
>
>  602       }
>
> Regards,
>
> Song Bing.
>
>
>
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