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ffmpeg / libavformat @ 72415b2a

# Date Author Comment
72415b2a 03/30/2010 11:30 PM Stefano Sabatini

Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk

32e543f8 03/30/2010 03:50 PM Benoit Fouet

Replace @returns by @return.

Originally committed as revision 22729 to svn://svn.ffmpeg.org/ffmpeg/trunk

8a36b59b 03/29/2010 10:29 PM Stefano Sabatini

Document url_exist().

Originally committed as revision 22725 to svn://svn.ffmpeg.org/ffmpeg/trunk

148bcae9 03/29/2010 10:17 PM Mohamed Naufal

Implement YOP demuxer and video decoder.

Patch by Mohamed Naufal gmailify(naufal11).

Originally committed as revision 22724 to svn://svn.ffmpeg.org/ffmpeg/trunk

c2bfd816 03/29/2010 07:17 PM Reimar Döffinger

Some spelling fixes.

Originally committed as revision 22720 to svn://svn.ffmpeg.org/ffmpeg/trunk

9cba6f5f 03/29/2010 05:36 PM Sam Gerstein

Add a timeout to the select() call. Patch by Sam Gerstein <sgerstein bluefinlab
com>.

Originally committed as revision 22718 to svn://svn.ffmpeg.org/ffmpeg/trunk

0f943ce6 03/28/2010 01:39 PM Howard Chu

Implement support to RTMP, RTMPT, RTMPE, RTMPTE, RTMPS protocols via
librtmp.

Patch by Howard Chu <hyc * highlandsun * com>.

Originally committed as revision 22710 to svn://svn.ffmpeg.org/ffmpeg/trunk

9bee2459 03/28/2010 10:31 AM Stefano Sabatini

Document url_seek().

Originally committed as revision 22709 to svn://svn.ffmpeg.org/ffmpeg/trunk

f990f6e3 03/28/2010 09:59 AM Vitor Sessak

Fix NUT (de)muxer warnings:
CC libavformat/nutdec.o
libavformat/nutdec.c: In function ‘read_seek’:
libavformat/nutdec.c:862: warning: passing argument 3 of ‘av_tree_find’ from incompatible pointer type
./libavutil/tree.h:44: note: expected ‘int ()(void *, const void *)’ but argument is of type ‘int ()(struct Syncpoint *, struct Syncpoint *)’...

4c1202f7 03/28/2010 08:48 AM Martin Storsjö

Initialize ssrc and base_timestamp using ff_random_get_seed()

Originally committed as revision 22706 to svn://svn.ffmpeg.org/ffmpeg/trunk

9b1db5ec 03/28/2010 01:15 AM Aurelien Jacobs

correct first pts for ogg skeleton

Originally committed as revision 22705 to svn://svn.ffmpeg.org/ffmpeg/trunk

66b6c745 03/27/2010 09:14 PM Stefano Sabatini

Document the behavior of av_metadata_get() if the prev parameter is
NULL.

Originally committed as revision 22704 to svn://svn.ffmpeg.org/ffmpeg/trunk

d14f5391 03/27/2010 07:10 PM Reimar Döffinger

Use more appropriate return values in txd demuxer.

Originally committed as revision 22703 to svn://svn.ffmpeg.org/ffmpeg/trunk

36031c20 03/27/2010 07:09 PM Reimar Döffinger

eacdata: fix a memleak, return partial packets and use proper return values.

Originally committed as revision 22702 to svn://svn.ffmpeg.org/ffmpeg/trunk

cae9a15c 03/26/2010 04:04 PM Martin Storsjö

Don't report EINTR from select as an error, retry select instead

Originally committed as revision 22694 to svn://svn.ffmpeg.org/ffmpeg/trunk

532aa889 03/26/2010 01:12 AM Micah F. Galizia

Fix updating condition for the probe_size variable in the internal
loop of ff_probe_input_buffer(), making sure that probe_size is always
set to probe_max_size in the last iteration.

Also make the function return an error if we get to the max probe
length and still cannot figure out what the format is....

4bc5cc23 03/25/2010 10:21 PM Martin Storsjö

Reassemble the RTSP URL before replacing hostname with the numerical IP

Originally committed as revision 22681 to svn://svn.ffmpeg.org/ffmpeg/trunk

7b4a3645 03/25/2010 10:04 PM Martin Storsjö

Simplify ff_rtsp_send_cmd_with_content_async, remove an unnecessary buffer

Originally committed as revision 22680 to svn://svn.ffmpeg.org/ffmpeg/trunk

60f198a7 03/25/2010 09:53 PM Martin Storsjö

Remove a redundant null pointer check

Originally committed as revision 22679 to svn://svn.ffmpeg.org/ffmpeg/trunk

30af0779 03/25/2010 09:49 PM Martin Storsjö

Don't force basic auth in RTSP, but retry with the server-specified method on failure

Originally committed as revision 22678 to svn://svn.ffmpeg.org/ffmpeg/trunk

2626308a 03/25/2010 09:48 PM Martin Storsjö

Actually parse the auth headers in RTSP

Originally committed as revision 22677 to svn://svn.ffmpeg.org/ffmpeg/trunk

aa8bf2fb 03/25/2010 09:47 PM Martin Storsjö

Make RTSP use the generic http authentication code

Still hardcoded to use Basic auth, without parsing the reply headers

Originally committed as revision 22676 to svn://svn.ffmpeg.org/ffmpeg/trunk

b17d11c6 03/25/2010 09:46 PM Martin Storsjö

Add separate method/url parameters to the rtsp_send_cmd functions

Originally committed as revision 22675 to svn://svn.ffmpeg.org/ffmpeg/trunk

e9fea405 03/25/2010 07:47 PM Martin Storsjö

Reindent

Originally committed as revision 22672 to svn://svn.ffmpeg.org/ffmpeg/trunk

4896dd57 03/25/2010 02:34 PM Jai Menon

Matroska muxer : Don't create audio tracks for unsupported audio codecs.

Originally committed as revision 22669 to svn://svn.ffmpeg.org/ffmpeg/trunk

855e7732 03/25/2010 01:58 PM Martin Storsjö

Add support for http digest authentication

Originally committed as revision 22667 to svn://svn.ffmpeg.org/ffmpeg/trunk

d8f92957 03/25/2010 07:14 AM Martin Storsjö

Reindent

Originally committed as revision 22666 to svn://svn.ffmpeg.org/ffmpeg/trunk

ddbeb954 03/25/2010 07:13 AM Martin Storsjö

Add a lowercase parameter to ff_data_to_hex

Originally committed as revision 22665 to svn://svn.ffmpeg.org/ffmpeg/trunk

b1cc5540 03/24/2010 11:06 PM Martin Storsjö

Make ff_rtsp_send_cmd simply call ff_rtsp_send_cmd_with_content

Originally committed as revision 22663 to svn://svn.ffmpeg.org/ffmpeg/trunk

3bfb30b9 03/24/2010 10:44 PM Vitor Sessak

Fix warnings in NUT demuxer:

libavformat/nutdec.c: In function ‘read_seek’:
libavformat/nutdec.c:862: warning: passing argument 4 of ‘av_tree_find’ from incompatible pointer type
./libavutil/tree.h:44: note: expected ‘void *’ but argument is of type ‘struct Syncpoint *’...

7ed8211b 03/24/2010 10:38 PM Luca Barbato

Issue a warning if the received CSeq isn't the expected one

Originally committed as revision 22661 to svn://svn.ffmpeg.org/ffmpeg/trunk

9405f733 03/24/2010 10:32 PM Martin Storsjö

Split out http authentication handling into a separate file

This prepares for adding support for more authentication methods

Originally committed as revision 22660 to svn://svn.ffmpeg.org/ffmpeg/trunk

59856b98 03/24/2010 07:58 PM Vitor Sessak

Fix warning:
libavformat/nut.c: In function ‘ff_nut_free_sp’:
libavformat/nut.c:80: warning: passing argument 4 of ‘av_tree_enumerate’ from incompatible pointer type
./libavutil/tree.h:92: note: expected ‘int ()(void *, void *)’ but argument is of type ‘void ()(void *, void *)’...

3032276b 03/24/2010 06:52 PM Martin Storsjö

Handle errors returned from ff_rtsp_read_reply in udp_read_packet properly

Originally committed as revision 22657 to svn://svn.ffmpeg.org/ffmpeg/trunk

852e0ca5 03/24/2010 06:40 PM Zhentan Feng

Move put_le16_nolen() to asf.c and give it a ff_ prefix. This way, it is easier
to share it with e.g. MMS.

Patch by Zhentan Feng <spyfeng gmail com>.

Originally committed as revision 22656 to svn://svn.ffmpeg.org/ffmpeg/trunk

d692850b 03/24/2010 11:11 AM Carl Eugen Hoyos

Silence ridiculous gcc warning.

Originally committed as revision 22654 to svn://svn.ffmpeg.org/ffmpeg/trunk

c6a5e087 03/24/2010 10:41 AM Tomas Härdin

Mask away AVSEEK_FORCE properly in some checks in url_fseek()
Patch by Tomas Härdin $(name).$(s/ä/a/ $(surname)) AT codemill DOT se

Originally committed as revision 22653 to svn://svn.ffmpeg.org/ffmpeg/trunk

06ebe916 03/23/2010 11:58 PM Justin Ruggles

Put ff_flac_write_header() in a separate C file to allow it to be shared without
duplicating code or adding a dependency on vorbiscomment.o.

Originally committed as revision 22652 to svn://svn.ffmpeg.org/ffmpeg/trunk

d40a999a 03/23/2010 05:22 PM Tomas Härdin

Fix seeking in DV when filesize is unknown.

Patch by Tomas Härdin, tomas D hardin A codemill D se

Originally committed as revision 22645 to svn://svn.ffmpeg.org/ffmpeg/trunk

7a033e08 03/23/2010 08:00 AM Martin Storsjö

Handle multiple RTSP transport options properly by adding all of them into the mask

Originally committed as revision 22644 to svn://svn.ffmpeg.org/ffmpeg/trunk

602eb779 03/23/2010 07:59 AM Martin Storsjö

Parse options in the RTSP URL only from the last question mark onwards

This helps if the URL (erroneously?) contains question marks within the path.

Originally committed as revision 22643 to svn://svn.ffmpeg.org/ffmpeg/trunk

2a21adf9 03/23/2010 07:55 AM Martin Storsjö

Reconstruct the RTSP URL, in order to remove the auth part from the URL sent to the server

Don't modify the user-specified s->filename at all, keep all modifications
locally and in rt->control_uri.

Originally committed as revision 22642 to svn://svn.ffmpeg.org/ffmpeg/trunk

19de452a 03/22/2010 09:58 PM Justin Ruggles

Move ff_flac_write_header() to flacenc.h, which removes the Matroska muxer's
dependency on flacenc.o and fixes the unnecessary dependency on vorbiscomment.o.

Originally committed as revision 22639 to svn://svn.ffmpeg.org/ffmpeg/trunk

c5113129 03/22/2010 08:18 PM Michael Niedermayer

Dont senselessly fail on rawvideo that isnt 3 files per frame.

Originally committed as revision 22637 to svn://svn.ffmpeg.org/ffmpeg/trunk

887af2aa 03/22/2010 04:26 PM Josh Allmann

RTP depacketization of Theora

Patch by Josh Allmann (joshua allmann gmail com)

Originally committed as revision 22636 to svn://svn.ffmpeg.org/ffmpeg/trunk

685e76b5 03/22/2010 03:07 PM Martin Storsjö

Reindent

Originally committed as revision 22635 to svn://svn.ffmpeg.org/ffmpeg/trunk

b7dc88fc 03/22/2010 03:07 PM Martin Storsjö

Add support for TCP as lower transport in the RTSP muxer

Originally committed as revision 22634 to svn://svn.ffmpeg.org/ffmpeg/trunk

9dff2308 03/22/2010 02:44 PM Martin Storsjö

Interpret valueless attributes in AMR ftmp lines as being 1

Originally committed as revision 22631 to svn://svn.ffmpeg.org/ffmpeg/trunk

6e69f6c4 03/22/2010 02:42 PM Martin Storsjö

Use the caller's RTSPMessageHeader in rtsp_setup_input_streams

Currently, the caller doesn't get the status_code and location for rediects,
since rtsp_setup_input_streams uses a copy of RTSPMessageHeader of its own.

Originally committed as revision 22630 to svn://svn.ffmpeg.org/ffmpeg/trunk

bb45237e 03/21/2010 06:06 PM James Darnley

Fix FLAC demuxer dependencies.
Patch by James Darnley <james darnley at gmail>

Originally committed as revision 22627 to svn://svn.ffmpeg.org/ffmpeg/trunk

2928b83c 03/21/2010 04:34 PM Stefano Sabatini

Make av_open_input_file() return AVERROR_INVALIDDATA rather than
AVERROR_NOFMT if the format is unknown / cannot be recognized.

It is returned AVERROR_INVALIDDATA, in the sense that the data is
invalid within what the specific libav* binary supports.

That was the last remaining use of AVERROR_NOFMT, which is going to be...

59b4b540 03/20/2010 01:42 PM Justin Ruggles

Add Changelog entry and bump lavf micro version for the addition of
VorbisComment writing for FLAC, Ogg/FLAC, and Ogg/Speex files.

Originally committed as revision 22607 to svn://svn.ffmpeg.org/ffmpeg/trunk

aeef3ec6 03/20/2010 01:39 PM James Darnley

Add VorbisComment writing to Ogg/FLAC and Ogg/Speex files.
Patch by James Darnley <james darnley at gmail>

Originally committed as revision 22606 to svn://svn.ffmpeg.org/ffmpeg/trunk

66061a12 03/20/2010 01:36 PM James Darnley

Add VorbisComment writing to FLAC files.
Patch by James Darnley <james darnley at gmail>.

Originally committed as revision 22605 to svn://svn.ffmpeg.org/ffmpeg/trunk

8d5e638f 03/18/2010 12:22 AM Stefano Sabatini

Make url_fseek() return AVERROR_EOF rather than AVERROR if end
of file is reached.

Originally committed as revision 22590 to svn://svn.ffmpeg.org/ffmpeg/trunk

a7a85dc4 03/17/2010 03:14 PM Ronald S. Bultje

Cast sample_fmt (as read from bitstream as a 16-bit value) to int16, so that
negative values, e.g. SAMPLE_FMT_NONE (-1), are read correctly also.

Originally committed as revision 22585 to svn://svn.ffmpeg.org/ffmpeg/trunk

c7f625ee 03/16/2010 09:45 PM Måns Rullgård

Fix erroneous behaviour when format probe hits end of file

If the format probe hits end of file, do not add the error code
to the buffer position. This is obviously wrong, and with a
small input file would cause a negative buffer overflow.

Fixes issue 1818....

972ffe62 03/15/2010 11:15 PM Aurelien Jacobs

rename av_read_frame_flush to ff_read_frame_flush
it is an internal function, not part of public API

Originally committed as revision 22562 to svn://svn.ffmpeg.org/ffmpeg/trunk

588af13f 03/15/2010 11:14 PM Aurelien Jacobs

rename av_program_add_stream_index to ff_program_add_stream_index
it is an internal function, not part of public API

Originally committed as revision 22561 to svn://svn.ffmpeg.org/ffmpeg/trunk

fbe8c56d 03/15/2010 11:04 PM Greg Maxwell

Correctly write last 0 lacing value when packet size is multiple of 255, patch by Greg Maxwell, gmaxwell at gmail dot com

Originally committed as revision 22559 to svn://svn.ffmpeg.org/ffmpeg/trunk

493f54ad 03/15/2010 10:54 PM Michael Niedermayer

Add AVSEEK_FORCE flag to indicate that the code should attempt to seek
by any means.

Originally committed as revision 22557 to svn://svn.ffmpeg.org/ffmpeg/trunk

6dfa52c8 03/15/2010 10:37 PM Aurelien Jacobs

matroskadec: fix missing dependency

Originally committed as revision 22555 to svn://svn.ffmpeg.org/ffmpeg/trunk

f75ab7a6 03/15/2010 07:03 PM Jai Menon

cosmetics : Print newline after error message.

Originally committed as revision 22551 to svn://svn.ffmpeg.org/ffmpeg/trunk

db128802 03/15/2010 04:36 PM Martin Storsjö

Reindent

Originally committed as revision 22549 to svn://svn.ffmpeg.org/ffmpeg/trunk

ad2ae6db 03/15/2010 04:36 PM Martin Storsjö

Don't let ff_rtsp_read_reply skip interleaved RTP/TCP packets in rtsp_write_packet.
Skip interleaved packets manually and recheck if there's more to be read.

Originally committed as revision 22548 to svn://svn.ffmpeg.org/ffmpeg/trunk

ec55edba 03/15/2010 04:31 PM Martin Storsjö

Make rtsp_skip_packet non-static, add ff prefix

Originally committed as revision 22547 to svn://svn.ffmpeg.org/ffmpeg/trunk

c040badb 03/15/2010 04:15 PM Martin Storsjö

Reindent

Originally committed as revision 22546 to svn://svn.ffmpeg.org/ffmpeg/trunk

c07c6f81 03/15/2010 02:20 PM Martin Storsjö

RTSP: Synchronize the start time of the chained RTP muxers

This makes sure that the streams get correctly synchronized when viewed,
previously the streams were out of sync by as much time as it took
between the initialization of the individual muxers.

Originally committed as revision 22545 to svn://svn.ffmpeg.org/ffmpeg/trunk

b1d55e5e 03/15/2010 10:37 AM Martin Storsjö

Use AVFormatContext.start_time_realtime in the RTP muxer

Originally committed as revision 22543 to svn://svn.ffmpeg.org/ffmpeg/trunk

2dad0dce 03/15/2010 10:36 AM Martin Storsjö

Move the NTP offset definitions to internal.h

Originally committed as revision 22542 to svn://svn.ffmpeg.org/ffmpeg/trunk

b8819c85 03/15/2010 10:29 AM Martin Storsjö

Add a new field AVFormatContext.start_time_realtime

Currently intended to be used by the RTP muxer

Originally committed as revision 22540 to svn://svn.ffmpeg.org/ffmpeg/trunk

63100f58 03/15/2010 08:49 AM Anton Khirnov

riff: don't pad extradata when writing ASF.
Patch by Anton Khirnov mirror(moc liamg saksyw)

Originally committed as revision 22539 to svn://svn.ffmpeg.org/ffmpeg/trunk

e536ccd6 03/15/2010 12:19 AM Aurelien Jacobs

matroskadec: use more appropriate error code

Originally committed as revision 22535 to svn://svn.ffmpeg.org/ffmpeg/trunk

e4a9e3cc 03/14/2010 11:59 PM Aurelien Jacobs

move ff_url_split() and ff_url_join() declarations to internal.h
those functions are not part of the public API

Originally committed as revision 22534 to svn://svn.ffmpeg.org/ffmpeg/trunk

eadd495d 03/14/2010 10:40 PM Micah F. Galizia

Move the probe loop from av_open_input_file() into its own method
av_probe_input_buffer() so that it can be reused. Here are a few
differences to the original way things were probed:

- maximum probe buffer size can be specified as a parameter.

- offset within the stream to probe from can be specified as a parameter....

28eb5773 03/14/2010 01:38 PM Reimar Döffinger

Avoid creating tiny (possibly only 64 bytes large) audio packets resulting in
huge processing and memory usage overhead for avi files with raw PCM audio.

Originally committed as revision 22521 to svn://svn.ffmpeg.org/ffmpeg/trunk

5ae092ee 03/13/2010 07:19 PM Stefano Sabatini

Replace all the occurrences of AVERROR_EIO with AVERROR, and mark
AVERROR_EIO for deletion at the next major bump.

Originally committed as revision 22513 to svn://svn.ffmpeg.org/ffmpeg/trunk

3477897e 03/13/2010 05:55 AM David Conrad

oggdec: Set packet duration for ogm streams

Originally committed as revision 22493 to svn://svn.ffmpeg.org/ffmpeg/trunk

6b10228a 03/12/2010 11:49 PM Aurelien Jacobs

matroskadec: add support for SIPR audio tracks

Originally committed as revision 22492 to svn://svn.ffmpeg.org/ffmpeg/trunk

1ab0406d 03/12/2010 11:35 PM Aurelien Jacobs

export rm_reorder_sipr_data() for future use by matroska demuxer

Originally committed as revision 22491 to svn://svn.ffmpeg.org/ffmpeg/trunk

adae9fa6 03/12/2010 11:34 PM Aurelien Jacobs

export sipr_subpk_size for future use by matroska demuxer

Originally committed as revision 22490 to svn://svn.ffmpeg.org/ffmpeg/trunk

81b743eb 03/12/2010 05:17 AM David Conrad

oggdec: Pass packets to header() until the stream is done with them

This fixes some old ogm files that had the 3rd vorbis header after a data
packet in another stream. This is invalid in ogg, but this change shouldn't
affect the behaviour of any valid file....

8730fad5 03/12/2010 05:16 AM David Conrad

oggdec: Parse ogm chapters

Originally committed as revision 22477 to svn://svn.ffmpeg.org/ffmpeg/trunk

2e508585 03/12/2010 05:16 AM David Conrad

oggdec: Cosmetics

Originally committed as revision 22476 to svn://svn.ffmpeg.org/ffmpeg/trunk

d8ba7483 03/12/2010 05:16 AM David Conrad

oggdec: Read ogm metadata

Originally committed as revision 22475 to svn://svn.ffmpeg.org/ffmpeg/trunk

533c30fc 03/12/2010 05:16 AM David Conrad

Const correctness for vorbis_comment

Originally committed as revision 22474 to svn://svn.ffmpeg.org/ffmpeg/trunk

b53cde48 03/12/2010 05:16 AM David Conrad

oggdec: Metadata is per-stream; don't merge multiple streams' together

Originally committed as revision 22473 to svn://svn.ffmpeg.org/ffmpeg/trunk

e4d2d8c5 03/12/2010 05:16 AM David Conrad

Add ff_ prefix to vorbis_comment

Originally committed as revision 22472 to svn://svn.ffmpeg.org/ffmpeg/trunk

34056cbb 03/11/2010 04:26 PM Martin Storsjö

Fix a crash in the H.263 RTP packetizer

If size 1 and buf[0] 0 and buf1 == 0 (the first byte after the
buffer), it would set size = -1 and crash in the later memcpy.

Originally committed as revision 22469 to svn://svn.ffmpeg.org/ffmpeg/trunk

70b462cc 03/11/2010 12:29 PM Peter Ross

Prevent memory leak introduced in r22389 in Bink demuxer: pass partial packets to decoder.

Originally committed as revision 22468 to svn://svn.ffmpeg.org/ffmpeg/trunk

5c7fd910 03/11/2010 08:33 AM Martin Storsjö

Cosmetics, break a long line, fix brace placement

Originally committed as revision 22465 to svn://svn.ffmpeg.org/ffmpeg/trunk

26cb700c 03/11/2010 08:24 AM Martin Storsjö

RTSP muxer: Create the SDP with the numerical IP of the peer
instead of using the original host name

Originally committed as revision 22464 to svn://svn.ffmpeg.org/ffmpeg/trunk

d8b91fae 03/11/2010 07:18 AM David Conrad

oggdec: Seek to keyframes

Originally committed as revision 22463 to svn://svn.ffmpeg.org/ffmpeg/trunk

873d117e 03/11/2010 07:17 AM David Conrad

oggdec: Determine pts and filepos on a packet basis in read_timestamp

This takes into account whether the granule defines the start or end times
of packets, and sets the correct file offset of the associated page.

Originally committed as revision 22462 to svn://svn.ffmpeg.org/ffmpeg/trunk

6abaa272 03/11/2010 07:17 AM David Conrad

oggdec: Move PTS/DTS calculation to a function

Originally committed as revision 22461 to svn://svn.ffmpeg.org/ffmpeg/trunk

2ac41150 03/11/2010 07:17 AM David Conrad

oggdec: Fix memory leak in setting up vorbis headers

Originally committed as revision 22460 to svn://svn.ffmpeg.org/ffmpeg/trunk

8f8320d7 03/11/2010 07:17 AM David Conrad

oggdec: Don't use ogg_stream's seq for vorbis or speex headers

Originally committed as revision 22459 to svn://svn.ffmpeg.org/ffmpeg/trunk

77560b0e 03/11/2010 07:17 AM David Conrad

oggdec: Fix duration calculation for streams with non-zero start

Originally committed as revision 22458 to svn://svn.ffmpeg.org/ffmpeg/trunk

32ad8692 03/11/2010 07:17 AM David Conrad

oggdec: Parse skeleton to determine the start time of each stream

Originally committed as revision 22457 to svn://svn.ffmpeg.org/ffmpeg/trunk

296bdf9c 03/11/2010 07:17 AM David Conrad

oggdec: Check that we have a codec in gptopts (needed for skeleton)

Originally committed as revision 22456 to svn://svn.ffmpeg.org/ffmpeg/trunk