New submission from longstone <[email protected]>:
When I'm tring to mux an AVI file with multiple video
and audio streams, the AVI encoder created a file
with uncorrect fourcc tag when the total streams'
count is more than 10.
According to the AVI spec, each stream is assigned
with one stream ID. If the new file contains 12
streams (6 video and 6 audio streams respectively),
their
stream ID and chunk tag should be:
0: '00dc'
1: '01dc'
2: '02dc'
3: '03dc'
4: '04dc'
5: '05dc'
6: '06wb'
7: '07wb'
8: '08wb'
9: '09wb'
10: '10wb'
11: '11wb'
The truth is that the file created by the current
version of avi encoder, has got an uncorrect chunk
tag for streams with stream ID 10 and 11. The chunk
tag
are '0:wb' and '0;wb' respectively.
This can be fixed by modifying the content of the
following function:
// Original source
static char* avi_stream2fourcc(char* tag, int
index, enum CodecType type)
{
tag[0] = '0';
tag[1] = '0' + index;
if (type == CODEC_TYPE_VIDEO) {
tag[2] = 'd';
tag[3] = 'c';
} else {
tag[2] = 'w';
tag[3] = 'b';
}
tag[4] = '\0';
return tag;
}
// Modified
// However, this works when the total stream number
<= 99.
// If the count is >= 100, no answer then...
static char* avi_stream2fourcc(char* tag, int
index, enum CodecType type)
{
tag[0] = '0' + (index/10);
tag[1] = '0' + (index%10);
if (type == CODEC_TYPE_VIDEO) {
tag[2] = 'd';
tag[3] = 'c';
} else {
tag[2] = 'w';
tag[3] = 'b';
}
tag[4] = '\0';
return tag;
}
----------
messages: 13518
priority: normal
status: new
substatus: new
title: AVI encoder create a file (contains multiple video and audio streams)
with uncorrect fourcc tag
type: bug
________________________________________________
FFmpeg issue tracker <[email protected]>
<https://roundup.ffmpeg.org/issue2563>
________________________________________________
