[Ffmpeg-devel] [PATCH] ffmpeg does not recognize his own grayscale rawvideo avi's

[Philippe De Muyter]

Currently, ffmpeg does not recognize the grayscale rawvideo avi's that he has
produced himself :(. Below is a patch to fix that.  Please apply.

Philippe

If you're not convinced, try the following :

Take any pgm file you have. (exemple xxx.pgm)

Copy it to /tmp/x0.pgm

	cp xxx.pgm /tmp/x0.pgm

Encode it as rawvideo avi :

	ffmpeg -i /tmp/x%1d.pgm -an -vcodec rawvideo /tmp/x0.avi
	...
	Input #0, image2, from '/tmp/x%1d.pgm':
	  Duration: 00:00:00.0, start: 0.000000, bitrate: N/A
	  Stream #0.0: Video: pgm, gray, 320x240, 25.00 fps(r)
	Output #0, avi, to '/tmp/x0.avi':
	  Stream #0.0: Video: rawvideo, gray, 320x240, q=2-31, 200 kb/s, 25.00 fps(c)
	Stream mapping:
	  Stream #0.0 -> #0.0
	Press [q] to stop encoding
	frame=    1 q=0.0 Lsize=      81kB time=0.0 bitrate=16500.8kbits/s
	video:75kB audio:0kB global headers:0kB muxing overhead 7.427083%

Try to decode the avi to remake a pgm

	./ffmpeg -i /tmp/x0.avi /tmp/y%1d.pgm
	...
	[avi @ 0x8406430]Could not find codec parameters (Video: Y800 / 0x30303859, 320x240)
	/tmp/x0.avi: could not find codec parameters

Decoding with the patched version :

	./ffmpeg -i /tmp/x0.avi /tmp/y%1d.pgm
	...
	Input #0, avi, from '/tmp/x0.avi':
	  Duration: 00:00:00.0, start: 0.000000, bitrate: 16500 kb/s
	  Stream #0.0: Video: rawvideo, gray, 320x240, 25.00 fps(r)
	Output #0, image2, to '/tmp/y%1d.pgm':
	  Stream #0.0: Video: pgm, gray, 320x240, q=2-31, 200 kb/s, 25.00 fps(c)
	Stream mapping:
	  Stream #0.0 -> #0.0
	Press [q] to stop encoding
	frame=    1 q=0.0 Lsize=       0kB time=0.0 bitrate=   0.0kbits/s
	video:75kB audio:0kB global headers:0kB muxing overhead -100.000000%

The patch :

Index: libavformat/riff.c
===================================================================
--- libavformat/riff.c	(revision 6242)
+++ libavformat/riff.c	(working copy)
@@ -110,6 +110,7 @@
     { CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '2') },
     { CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
     { CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
+    { CODEC_ID_RAWVIDEO, MKTAG('Y', '8', '0', '0') },
     { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
     { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
--