Changes between Version 19 and Version 20 of gstreamer

Timestamp:

12/17/2020 09:42:42 PM (4 years ago)

Author:

Tim Harvey

Comment:

added note about coda cma requirements

gstreamer

@@ -746 +746 @@
 }}}
  * The CODA960 decoder outputs NV12/I420/YV12 YUV pixel formats
- * The CODA driver requires CMA memory for buffers when it is used. Make sure to provide the kernel with enough CMA memory with the kernel command-line (ie 'cma=64M' for 64MB which should be enough)
+ * The CODA driver requires CMA memory for buffers when it is used. Make sure to provide the kernel with enough CMA memory with the kernel command-line (ie 'cma=64M' for 64MB which should be enough but you may need to bump this to 128MB for 1080p)
  * V4L2 JPEG Decoder support has not yet been added to the CODA driver as of Linux 5.6 - patches have been posted and are in the Gateworks 5.4 kernel
 
@@ -1365 +1365 @@
 For example, if you wanted to see DEBUG level messages for the {{{videotestsrc}}} element you can set GST_DEBUG=videotestsrc:4
 
+== insufficient CMA memory when using CODA
+When using the CODA element ($GST_CONVERT) to perform video compression or decompression of high resolution images you may not have enough CMA memory allocated. By default the kernel allocates 64MiB but you can set this via the kernel command line by adding a 'cma=128M' for example to double it.
+
+Insufficient CMA memory for coda will show a 'Failed to allocate required memory' with kernel messages like:
+{{{#!bash
+cma: cma_alloc: alloc failed, req-size: 512 pages, ret: -12
+coda 2040000.vpu: dma_alloc_coherent of size 2097152 failed
+}}}
+
 
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