ffmpeg: always use single threaded decoding for attached pictures

Since af1761f7b5b1b72197dc40934953b775c2d951cc ffmpeg waits for a frame in each
stream before writing the output header. If we are using threaded decoding for
attached pictures, we have to read till EOF to be able to finally flush the
decoder and output the decoded frame. This essentially makes ffmpeg buffer all
non-attached picture packets, which will cause a "Too many packets buffered for
output stream" eventually.

By forcing single threaded decoding, we get a frame from a single packet as
well and we can avoid the error.

Fixes part of ticket #6375:
ffmpeg -i 46564100.mp3 -acodec libmp3lame -ab 128k -ac 2 out.mp3

Reviewed-by: Hendrik Leppkes <h.leppkes@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

lavc: add support for OpenJPEG 2.3.0

Signed-off-by: Michael Bradshaw <mjbshaw@google.com>

lavu/utils: Use "__asm__" like everywhere else in the codebase.

lavfi: Rename local variables "main" as "master".

Silences several warnings:
main is usually a function

lavf/rtpenc: Add support for little-endian G.726.

lavf/sdp: Fix MIME-type for big-endian G.726.

RFC 3551 defines "G726" for little-endian ("right-justified") G.726
and announces "AAL2-G726" for big-endian ("left-justified") G.726.

lavfi/avfilter.c: Correct guess_status_pts to account for differing link timebases.

Signed-off-by: Sasi Inguva <isasi@google.com>

lavf/img2dec: Auto-detect svg images.

avformat/mp3enc: flush buffered packets if referencing fails

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>

avcodec/v4l2: fix single plane decoding

avdevice/decklink_dec: fix extracting luma

Signed-off-by: Marton Balint <cus@passwd.hu>

avfilter/vf_fps: add eof_action filter option

Allows to specify the action to be performed when reading the last frame
from the internal FIFO buffer. By default the last frame is written to
filter output depending on the timestamp rounding method. When using
"pass" action the last frame is passed through if input duration
has not been reached yet.

Examples using an input file with 25Hz, 1.4sec duration:
 - "fps=fps=1:round=near" generates an output file of 1sec
 - "fps=fps=1:round=near:eof_action=pass" generates an output file of
   2sec

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>

rtsp: Move message parsing to a separate function

Make easier to handle the polling function before we implement
full threading support.

(cherry picked from libav commit ca960161f087ca38267b88ce90592010c59584f1)
Signed-off-by: James Almer <jamrial@gmail.com>

avcodec/mips: Cleanup unused functions

Signed-off-by: Kaustubh Raste <kaustubh.raste@imgtec.com>
Reviewed-by: Manojkumar Bhosale <Manojkumar.Bhosale@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avformat: fix id3 chapters

These changes store id3 chapter data in ID3v2ExtraMeta and introduce
ff_id3v2_parse_chapters to parse them into the format context if needed.

Encoders using ff_id3v2_read, which previously parsed chapters into the
format context automatically, were adjusted to call
ff_id3v2_parse_chapters.

Signed-off-by: wm4 <nfxjfg@googlemail.com>

build: add install targets for the examples

Split it off from install-data.

Among other things, this prevents spamming triplicate log lines during install.

Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: James Almer <jamrial@gmail.com>

avfilter/vf_fps: clean-up filter options

Add missing AV_OPT_FLAG_FILTERING_PARAM flag to "start_time" option.
Fix indent of "round" named constants and clear unused field values.

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>

doc/filters: align order of fps filter options to implementation

Align order of "start_time" option within fps filter documentation to actual
implementation. Also fix some documentation cosmetics.

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>

lavc/v4l2: Fix printf format for int64_t

avformat/wavenc: replace literal numbers with enum constants

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>

x86/blockdsp: use three operand form for an instruction

Fixes assembling with old yasm.

avcodec/x86/lossless_videoencdsp: Fix warning: signed dword value exceeds bounds

Add () to regsize define

Suggested-by: Henrik Gramner <henrik@gramner.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/x86/lossless_videoencdsp: Fix handling of small widths

Fixes out of array access
Fixes: crash-huf.avi

Regression since: 6b41b4414934cc930468ccd5db598dd6ef643987

This could also be fixed by adding checks in the C code that calls the dsp

Found-by: Zhibin Hu and 连一汉 <lianyihan@360.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/v4l2: set sizeimage param for non-raw buffers [fixes #6716]

Some V4L2 drivers fail to allocate buffers when sizeimage is not set
to a max value. This is indeed the case for s5p-mfc [1]

Most drivers should be able to calculate this value from the frame
dimensions and format - or at least have their own default.

However since this work around should not impact those drivers doing
the "right thing" this commit just provides such a default.

The calculations were extracted from the v4l2 driver used to develop
the ffmpeg v4l2_m2m support [2]. See venc.c and vdec.c

[1] linux.git/drivers/media/platform/s5p-mfc
[2] linux.git/drivers/media/platform/qcom/venus/

lavc/v4l2: Mark static const tables as such

lavc/v4l2: Remove use of lfind()

This is not present in older bionic and therefore fails to build there,
and the code is much simpler without it anyway.

configure: fix detecting libdl when dlsym requires extra linker flags

Regression since 84b3f53acadced2dd31f6be95b491b25183b8c22.

avdevice/decklink: Fix segfault when running -list_devices on OSX

The string is allocated with CFStringGetCString but was being
deallocated with free(), which would intermittently result in
a segmentation fault.  Use the correct function for freeing the
allocated CFString.

Signed-off-by: Devin Heitmueller <dheitmueller@ltnglobal.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

avdevice/decklink_dec: fix multipacket op47 decoding

It was disabled by mistake.

Signed-off-by: Marton Balint <cus@passwd.hu>

MAINTAINERS: change the decklink maintainer to myself

Signed-off-by: Marton Balint <cus@passwd.hu>

movenc: take packet dts shifting into mention in check_pkt

This FFmpeg-specific "fuzzer fix" was never perfect, but now it
stopped encoding of actual content with a big enough DTS shift.
This returns the function to its original state of results
before negative CTS offsets were added.

I remember dealing with this function before, but somehow had
forgotten about it during VDD. The test cases not tripping this
over also didn't help.

build: make h264 VT encoder select the VT encoder dependency

Otherwise, it's never enabled unless the user explicitely enables it.

Regression since 9ef5a2f5f30bdc4ac86275ae4b4708ab4681b21d.

Fixes Ticket #6702.

Merge commit 'd154bdd3d053128c908a994bb26e14bbc17f0e53'

* commit 'd154bdd3d053128c908a994bb26e14bbc17f0e53':
  configure: Simplify dlopen check

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'd7b2bb5391bf55e8f9421bff7feb4c1fddfac4bf'

* commit 'd7b2bb5391bf55e8f9421bff7feb4c1fddfac4bf':
  h264_sei: Check actual presence of picture timing SEI message

This commit is a noop, see 6a37abc59af4d87d4c55f7d812ac62d4d6a7464b

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '21cca00dfeaec08ca93cf94ed33f4311cf1d8c84'

* commit '21cca00dfeaec08ca93cf94ed33f4311cf1d8c84':
  build: Explicitly disable external libraries when not explicitly enabled

This commit is a noop.

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'e1a6d63c7eeff2f0ec8173546357bfaa9deecea4'

* commit 'e1a6d63c7eeff2f0ec8173546357bfaa9deecea4':
  fate: Rename WMV8_DRM decoder tests to WMV3_DRM

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '79331df362fb05a0d04ca9489c87e5b80077a3f4'

* commit '79331df362fb05a0d04ca9489c87e5b80077a3f4':
  rtsp: Lazily set up the pollfd array once

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'd8f36a6aa33e9f904fa47caa0329ddaac391cd7d'

* commit 'd8f36a6aa33e9f904fa47caa0329ddaac391cd7d':
  nvenc: Fix the preset mapping list

This commit is a noop.

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '698ac8f9cabd053f2c19346a77b92f8eae4218fc'

* commit '698ac8f9cabd053f2c19346a77b92f8eae4218fc':
  fate: Make null comparison method more useful

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'c483398bb7ef66f61ed2dcb09f3d6160683da0eb'

* commit 'c483398bb7ef66f61ed2dcb09f3d6160683da0eb':
  build: Drop DOC_ prefix from EXAMPLES-related variables

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '5263f464db5f2df74ddf712f6d1221b24475fa8e'

* commit '5263f464db5f2df74ddf712f6d1221b24475fa8e':
  rtsp: Lazily allocate the pollfd array

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'b9b82151a1aaa8bbf389853a6142c4e101d80b86'

* commit 'b9b82151a1aaa8bbf389853a6142c4e101d80b86':
  rtsp: Move the pollfd setup out of the for loop

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '150e99d694f33ab9ad678834964909aa315d14a1'

* commit '150e99d694f33ab9ad678834964909aa315d14a1':
  rtsp: Factor out packet reading

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '4141a5a240fba44b4b4a1c488c279d7dd8a11ec7'

* commit '4141a5a240fba44b4b4a1c488c279d7dd8a11ec7':
  Use modern avconv syntax for codec selection in documentation and tests

Merged-by: James Almer <jamrial@gmail.com>

avformat/mp3dec: Fix definition of MIDDLE_BITS

The number of bits from bit #m to #n is n - m plus 1.

Signed-off-by: Ingo Brückl <ib@wupperonline.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/dxv: Check for end of input in dxv_decompress_dxt5()

Fixes: Timeout
Fixes: 3291/clusterfuzz-testcase-4630024655208448

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/truemotion2: Fix integer overflows in tm2_high_chroma()

Fixes: runtime error: signed integer overflow: -1408475220 + -1408475220 cannot be represented in type 'int'
Fixes: 3336/clusterfuzz-testcase-minimized-5656839179993088

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/aacdec_template: Clear tns present flag on error

Fixes: 3444/clusterfuzz-testcase-minimized-6270352105668608

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

mpegdec: fix redundant dummy frames issue of interlaced clips

It is to fix https://trac.ffmpeg.org/ticket/6677. Actucally it is a
regression of commit 99e07a4453732058df90885f80b3db3b4f37cb3c which
always inserts a dummy frame when decode the first key field picture.

Signed-off-by: Zhong Li <zhong.li@intel.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Merge commit 'da8093f712d625db7ce4a2526fb52994e01921ec'

* commit 'da8093f712d625db7ce4a2526fb52994e01921ec':
  fate: Use bitexact optimizations in the svq3-2 test

This commit is a noop, see b591329c3afe445c45eaecadd5fe3b80a837ee2f

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '984736dd9e5b50987a5910e22495304e4a6d975c'

* commit '984736dd9e5b50987a5910e22495304e4a6d975c':
  lavc: make sure not to return EAGAIN from codecs

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '4cc0227040adb9efc63be6a5765e3214f5c6f662'

* commit '4cc0227040adb9efc63be6a5765e3214f5c6f662':
  apetag: account for header size if present when returning the start position
  apetag: fix flag value to signal footer presence

This commit is a noop, see
e8d6fef3161f35878f8e0abf9d27d2c45a5d40b6
84d874a680ff647bc84de44967b638f246a8b832

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'b2788fe9347c02b1355574f3d28d60bfe1250ea7'

* commit 'b2788fe9347c02b1355574f3d28d60bfe1250ea7':
  svq3: fix the slice size check

Merged-by: James Almer <jamrial@gmail.com>

doc: Add mailing list FAQ

Signed-off-by: Lou Logan <lou@lrcd.com>
Reviewed-by: Kieran O Leary <kieran.o.leary@gmail.com>
Reviewed-by: Carl Eugen Hoyos <ceffmpeg@gmail.com>

Merge commit 'cd7a2e1502f174c725c0de82711d2c7649057574'

* commit 'cd7a2e1502f174c725c0de82711d2c7649057574':
  asfdec: fix reading files larger than 2GB

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '248dc5c1646dcdd96fe79761105c4ae889e711fd'

* commit '248dc5c1646dcdd96fe79761105c4ae889e711fd':
  h264dec: fix dropped initial SEI recovery point

Merged-by: James Almer <jamrial@gmail.com>

libavcodec/blockdsp : add AVX version

Also modify the required alignment, to 32 instead of 16
for several codecs

Signed-off-by: James Almer <jamrial@gmail.com>

lavf/mxfdec: Search all components of material track for source package.

Fixes ticket #5925.

Reviewed-by: Marton

fate: Add a test for latm-in-dvb auto-detection, ticket #6657.

avcodec/proresdec2: Use LAST_SKIP_BITS where possible

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/proresdec2: SKIP_BITS() does not work with len=32

Fixes: invalid shift
Fixes: 3482/clusterfuzz-testcase-minimized-5446915875405824

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/hevcdsp_template: Fix undefined shift

Fixes: runtime error: left shift of negative value -255
Fixes: 3373/clusterfuzz-testcase-minimized-5604083912146944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/encode: do proper cleanup on failure

Fixes the last remaining memleaks introduced by a22c6a4796ca1f2cbee6784262515da876fbec22.

Signed-off-by: James Almer <jamrial@gmail.com>

avformat/mxfenc: Fix labels for IEC PAL DV 420

avformat/mxfenc: Add IEC DV25

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

build: fix compilation of tools with OpenCL enabled

Signed-off-by: James Almer <jamrial@gmail.com>

fate: disable fate-svq3-2

The first frame changes depending on --enable-memory-poisoning being
used to configure ffmpeg or not, even if requesting bitexact decoding.
Disable the test until this is fixed.

Signed-off-by: James Almer <jamrial@gmail.com>

avcodec/encode: free non-referenced packets' side data in the old encode API functions

Fixes memleaks introduced by a22c6a4796ca1f2cbee6784262515da876fbec22.

Merge commit '8e4d4efc67e154fdffd65964a7cfeef740320827'

* commit '8e4d4efc67e154fdffd65964a7cfeef740320827':
  fate: Add another SVQ3 test to increase coverage

Also included a fix from da8093f712d625db7ce4a2526fb52994e01921ec.

The demuxer option "-ignore_editlist 1 " is temporarily added to the
test as well, to workaround a regression in the edit list mov parsing
code.

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'b8f66c0838b4c645227f23a35b4d54373da4c60a'

* commit 'b8f66c0838b4c645227f23a35b4d54373da4c60a':
  aarch64: vp9itxfm: Reorder iadst16 coeffs
  arm: vp9itxfm: Reorder iadst16 coeffs
  aarch64: vp9itxfm: Reorder the idct coefficients for better pairing
  arm: vp9itxfm: Reorder the idct coefficients for better pairing
  aarch64: vp9itxfm: Avoid reloading the idct32 coefficients
  arm: vp9itxfm: Avoid reloading the idct32 coefficients
  arm: vp9lpf: Implement the mix2_44 function with one single filter pass
  aarch64: vp9lpf: Use dup+rev16+uzp1 instead of dup+lsr+dup+trn1
  arm/aarch64: vp9lpf: Keep the comparison to E within 8 bit

This commit is a noop, see
3fbbad29847c79f422128ad88f174c53a5f6c449
f32690a298badbf2df66319e9b38236ad3d3e321
a88db8b9a016fe47997029e3653cdac4777994b4
600f4c9b03b8d39b986a00dd9dafa61be7d86a72
2905657b902fea8718434f0d29056cf4e7434307
4f693b56bdcfda37b4f2c48b39dcf12439c149c8
f952273019984da5e7bfa1298e1cdb0683049296
b2e20d89844b51c3d9565b293606d1433bd67f25
26ee83acc4ebd765529b666c7f050243b7677d76

Merged-by: James Almer <jamrial@gmail.com>

Merge commit 'ed6a891c364f8b0850b557d9578b8920cc15a937'

* commit 'ed6a891c364f8b0850b557d9578b8920cc15a937':
  Place attribute_deprecated in the right position for struct declarations

This commit is a noop, see
99530387283fc58e6c3ac42724955b8569daf548
6ff3da4f6a8e460d77bb65fed4267bf48f513fcf

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '04d2afa93b6c6f320ac45dd99ce1226f3c3d5ac8'

* commit '04d2afa93b6c6f320ac45dd99ce1226f3c3d5ac8':
  mkv: Update the seek test to match 5d3953a5dc
  fate: Update fate-lavf-mkv after commit 5d3953a5dc

This commit is a noop.

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '156bc0193bd47d3f4b3adaa93be0e206e12686ab'

* commit '156bc0193bd47d3f4b3adaa93be0e206e12686ab':
  fate: Add webp alpha test

This commit is a noop, see
bd2cec7021a0e275d4551a56d0a220ba2f9bd691
2bdb26b4eeec8142c927645a10b7f55cae5cdcc5
92bf87db294c0544168f572ba6739db7d2ba2ba3

Merged-by: James Almer <jamrial@gmail.com>

Merge commit '5d3953a5dcfd5f71391b7f34908517eb6f7e5146'

* commit '5d3953a5dcfd5f71391b7f34908517eb6f7e5146':
  matroskaenc: factor ts_offset into block timecode computation

Merged-by: James Almer <jamrial@gmail.com>

avdevice/decklink_dec: remove av_dup_packet() usage

Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: James Almer <jamrial@gmail.com>

avdevice/decklink_dec: use av_packet_add_side_data()

It uses the existing buffer instead of allocating a new one.

Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: James Almer <jamrial@gmail.com>

avcodec/encode: remove usage of av_dup_packet()

Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

avcodec/avpacket: deprecate av_copy_packet_side_data()

It leaks memory and destroys the dst packet in case of failure, and it
ultimately duplicates functionality already existing in the saner
av_packet_copy_props().

Reviewed-by: wm4
Signed-off-by: James Almer <jamrial@gmail.com>

Merge commit 'c95169f0ec68bdeeabc5fde8aa4076f406242524'

* commit 'c95169f0ec68bdeeabc5fde8aa4076f406242524':
  build: Move cli tool sources to a separate subdirectory

Merged-by: James Almer <jamrial@gmail.com>

tools/ismindex: remove unused header

libavcodec/exr : add x86 SIMD for predictor

Signed-off-by: James Almer <jamrial@gmail.com>

lavfi/vmafmotion: Allow more pix_fmts.

avdevice/decklink_dec: Used av_parity instead of duplicated function

Partially revert "Merge commit '71a49fe25f2e4468fbbadbebef8d073b1b3cc1a5'"

Revert back to the test as done by commit af7a75cb517141f649cbbe0a9dcdb4854359b740,
where it was changed to compile and not just preprocess to fix build failures on
FreeBSD with gcc 4.7

Signed-off-by: James Almer <jamrial@gmail.com>

avfilter/vf_thumbnail_cuda: Avoid mixing declaration and statements

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/v4l2_context: Reduce spelling variations

Reviewed-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/v4l2_buffers: More clear return code documentation

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/jpeg2000: Check that codsty->log2_prec_widths/heights has been initialized

Fixes: OOM
Fixes: 2225/clusterfuzz-testcase-minimized-5505632079708160

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

lavf/bit: Fix the G.729 bit auto-detection.

avfilter/vmaf_motion: use correct header guards

Fixes fate-source

Signed-off-by: James Almer <jamrial@gmail.com>

avfilter: add vmafmotion filter

Signed-off-by: Ashish Singh <ashk43712@gmail.com>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

build: fix cleaning compiled unstripped examples

Signed-off-by: James Almer <jamrial@gmail.com>

MAINTAINERS: add myself to the general developers list

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/hevc_sei: Support HEVC paired fields.

Correctly set the interlaced_frame and top_field_first fields when pic_struct
indicates paired fields.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

build: add missing changes to ensure examples build with progs-suffix

Merge commit 'ab566cc96bc0c31b34d944214bc06cec8ae8b640'

* commit 'ab566cc96bc0c31b34d944214bc06cec8ae8b640':
  build: Separate logic for building examples from that for building avtools

Merged-by: James Almer <jamrial@gmail.com>

build: don't call install with the -T option

It's not available on macOS.

Should fix a regression instroduced by b25d6290c67e193b91becab12e6c88df134cee81.

Signed-off-by: James Almer <jamrial@gmail.com>

Merge commit 'acb0dea27efff4b35796015b96570b59fd517078'

* commit 'acb0dea27efff4b35796015b96570b59fd517078':
  build: Split logic for building examples off into a separate Makefile

We already have a Makefile in doc/examples, but it's separate from the build
system and meant to be installed as part of the documentation to help users
compile the installed .c example files.
Move it to Makefile.example to make place for the new build system Makefile.

Merged-by: James Almer <jamrial@gmail.com>

lavf/bit: Use pkt->size instead of a constant for G.729 frame size.

Makes the code more readable, the muxer may support variable bit-rate in the future.

lavf/bit: Only build the G.729 bit demuxer if requested.

Fix the condition for the G.729 bit muxer.