#390: ffplay cannot select desired audio/video stream, consider there is a bug
in
the av_read_frame function
----------------------+----------------------
Reporter: qrtt1 | Owner: michael
Type: defect | Status: new
Priority: important | Component: FFplay
Version: git | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced: 0
Analyzed: 0 |
----------------------+----------------------
Comment (by qrtt1):
I compared with the request sent by mplayer (packet caught by wireshark).
In stream selection header, it sent exactly two streams (video and audio):
{{{
Pragma: stream-switch-entry=ffff:1:0 ffff:6:0 \r\n
}}}
However, libavformat/mmsh.c select all the streams,
we always get the last two index 8 and 9.
I test it by hardcode stream index in mmsh.c. The ffprobe can give the
desired streams:
{{{
[asf @ 0x10104e600] pkt idx 0
[PACKET]
codec_type=audio
stream_index=0
pts=175697
pts_time=175.697000
dts=175697
dts_time=175.697000
duration=170
duration_time=0.170000
size=2731.000000
pos=1581626
flags=K
[/PACKET]
[asf @ 0x10104e600] pkt idx 4
[PACKET]
codec_type=video
stream_index=4
pts=177720
pts_time=177.720000
dts=177720
dts_time=177.720000
duration=0
duration_time=0.000000
size=3000.000000
pos=1578738
flags=_
[/PACKET]
}}}
It is my test code
{{{
qty:ffmpeg_bug qrtt1$ git diff
diff --git a/libavformat/mmsh.c b/libavformat/mmsh.c
index 029baed..8b79616 100644
--- a/libavformat/mmsh.c
+++ b/libavformat/mmsh.c
@@ -268,10 +268,14 @@ static int mmsh_open(URLContext *h, const char *uri,
int flags)
return AVERROR(ENOMEM);
for (i = 0; i < mms->stream_num; i++) {
char tmp[20];
- err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ",
mms->streams[i].id);
- if (err < 0)
- goto fail;
- av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
+ if(i==0||i==4)
+ {
+ err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ",
mms->streams[i].id);
+ if (err < 0)
+ goto fail;
+ av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
+ av_log(NULL, AV_LOG_ERROR, "stream select %d %d\n", i,
mms->streams[i].id);
+ }
}
// send play request
err = snprintf(headers, sizeof(headers),
@@ -284,7 +288,9 @@ static int mmsh_open(URLContext *h, const char *uri,
int flags)
"Pragma: stream-switch-count=%d\r\n"
"Pragma: stream-switch-entry=%s\r\n"
"Connection: Close\r\n",
- host, port, mmsh->request_seq++, mms->stream_num,
stream_selection);
+ host, port, mmsh->request_seq++, 2 /*mms->stream_num
*/, stream_selection);
+
+ av_log(NULL, AV_LOG_ERROR, "stream select header\n%s\n", headers);
av_freep(&stream_selection);
if (err < 0) {
av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
}}}
{{{
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/390#comment:1>
FFmpeg <http://ffmpeg.org>
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