On 27.11.2017 12:00, Carles Vila wrote:
[0:1] is the input stream mapping to the complex filter chain. With
this syntax, it references the second stream from the first file. For
your particular file, it's indeed the audio stream. You could use
"[0:a]", just in case the order of video and audio streams are swapped
(or undetermined, as in VOBs).
Carles$ ffmpeg -i MEAT01_01A_ENG_ME_DV_5.1_24HD_TC.mov -filter_complex
"[0:1]pan=2c|c0=c0+c1|c1=c2+c3" -s 640x360 -pix_fmt yuv420p
proxy_stereo.mp4
While this result looks okay:
Stream mapping:
Stream #0:1 (pcm_s24le) -> pan (graph 0)
pan (graph 0) -> Stream #0:0 (aac)
Stream #0:0 -> #0:1 (prores (native) -> h264 (libx264))
please do try changing that command line to the more specific mapping
variant:
$ ffmpeg -i MEAT01_01A_ENG_ME_DV_5.1_24HD_TC.mov -filter_complex
"[0:a]pan=2c|c0=c0+c1|c1=c2+c3[a]" -s 640x360 -pix_fmt yuv420p -map 0:v
-map "[a]" proxy_stereo.mp4
Additionally, if you increase the logging level with "loglevel verbose",
the pan
filter should show you what it's doing.
If that command still doesn't work, can you change the filter
expression to
"[0:a]pan=2c|c0=c0+c1|c1=c2+c3[a],volumedetect"
so that we can get an impression whether something should be heard?
ffmpeg version 3.1.4 Copyright (c) 2000-2016 the FFmpeg developers
This is a bit old. Could you kindly test a recent build from git
master, or a recent release? We don't want to help you debug
long-solved bugs, if you know what I mean. (If you can't build
yourself, binaries are available for many major platforms.)
Hi Moritz Thanks for your help! but still no luck.
I found a 3.3.1 binary which I hope is enough up to date. I'm stuck on OSX
10.8 on this machine.... I used your syntax and I included the verbose
option. Here is the output. The volumedetect filter was giving me problems
regarding unsupported channel layout, I left it out at this time. Reading
the pan coefficients everything seems ok, but still silent... Maybe the s32
bit audio format?
ffmpeg331 -i MEAT01_02A_ENG_ME_DV_5.1_24HD_TC.mov -filter_complex
"[0:a]pan=2c|c0=c0+c1|c1=c2+c3[a]" -s 640x360 -pix_fmt yuv420p -map 0:v
-map "[a]" -loglevel verbose proxy_stereo_2A.mp4
ffmpeg version 3.3.1 Copyright (c) 2000-2017 the FFmpeg developers
built with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
configuration: --prefix=/Volumes/Ramdisk/sw --enable-gpl
--enable-pthreads --enable-version3 --enable-libspeex --enable-libvpx
--disable-decoder=libvpx --enable-libmp3lame --enable-libtheora
--enable-libvorbis --enable-libx264 --enable-avfilter
--enable-libopencore_amrwb --enable-libopencore_amrnb --enable-filters
--enable-libgsm --enable-libvidstab --enable-libx265 --disable-doc
--arch=x86_64 --enable-runtime-cpudetect
libavutil 55. 58.100 / 55. 58.100
libavcodec 57. 89.100 / 57. 89.100
libavformat 57. 71.100 / 57. 71.100
libavdevice 57. 6.100 / 57. 6.100
libavfilter 6. 82.100 / 6. 82.100
libswscale 4. 6.100 / 4. 6.100
libswresample 2. 7.100 / 2. 7.100
libpostproc 54. 5.100 / 54. 5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'MEAT01_02A_ENG_ME_DV_5.1_24HD_TC.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2017-11-09T12:16:50.000000Z
Duration: 00:11:13.59, start: 0.000000, bitrate: 179162 kb/s
Stream #0:0(eng): Video: prores, 1 reference frame (apch / 0x68637061),
yuv422p10le(bt709, progressive), 1920x1080, 165325 kb/s, SAR 1:1 DAR 16:9,
23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
Metadata:
creation_time : 2017-11-09T12:16:50.000000Z
handler_name : Apple Alias Data Handler
encoder : Apple ProRes 422 (HQ)
timecode : 00:00:00:00
Stream #0:1(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, 12
channels, s32 (24 bit), 13824 kb/s (default)
Metadata:
creation_time : 2017-11-09T12:16:50.000000Z
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
Metadata:
creation_time : 2017-11-09T12:16:50.000000Z
handler_name : Apple Alias Data Handler
timecode : 00:00:00:00
File 'proxy_stereo_2A.mp4' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:1 (pcm_s24le) -> pan (graph 0)
Stream #0:0 -> #0:0 (prores (native) -> h264 (libx264))
pan (graph 0) -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[graph 1 input from stream 0:0 @ 0x7fe0e1000940] w:1920 h:1080
pixfmt:yuv422p10le tb:1/24000 fr:24000/1001 sar:1/1 sws_param:flags=2
[scaler_out_0_0 @ 0x7fe0e1000e60] w:640 h:360 flags:'bicubic' interl:0
[scaler_out_0_0 @ 0x7fe0e1000e60] w:1920 h:1080 fmt:yuv422p10le sar:1/1 ->
w:640 h:360 fmt:yuv420p sar:1/1 flags:0x4
[libx264 @ 0x7fe0e0808600] using SAR=1/1
[libx264 @ 0x7fe0e0808600] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fe0e0808600] profile High, level 3.0
[libx264 @ 0x7fe0e0808600] 264 - core 148 - H.264/MPEG-4 AVC codec -
Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1
ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11
fast_pskip=1 chroma_qp_offset=-2 threads=11 lookahead_threads=1
sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1
weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40
intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0
qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[graph_0_in_0_1 @ 0x7fe0e120e360] tb:1/48000 samplefmt:s32 samplerate:48000
chlayout:(null)
[format_out_0_1 @ 0x7fe0e120e8a0] auto-inserting filter 'auto_resampler_0'
between the filter 'Parsed_pan_0' and the filter 'format_out_0_1'
[Parsed_pan_0 @ 0x7fe0e120e180] o0 = 1 i0 + 1 i1 + 0 i2 + 0 i3 + 0 i4 + 0
i5 + 0 i6 + 0 i7 + 0 i8 + 0 i9 + 0 i10 + 0 i11
[Parsed_pan_0 @ 0x7fe0e120e180] o1 = 0 i0 + 0 i1 + 1 i2 + 1 i3 + 0 i4 + 0
i5 + 0 i6 + 0 i7 + 0 i8 + 0 i9 + 0 i10 + 0 i11
[auto_resampler_0 @ 0x7fe0e120f1a0] ch:2 chl:stereo fmt:s32 r:48000Hz ->
ch:2 chl:stereo fmt:fltp r:48000Hz
[...]
Seems similar but not exactly the same as a pan filter bug I recently
stumbled over: http://trac.ffmpeg.org/ticket/6790
In my case the input channel layout is known but output channel layout
is empty. In your case the output channel layout is known (stereo) but
the input channel layout is empty (null).
Have not found the time yet to debug this further.
Regards,
Tobias
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