Dear list,
My institution has transformed an old SD telecine and added a 4K camera with a
Decklink capture card.
We are currently capturing Uncompressed avi.
After capture, the file plays correctly (both video and audio).
The problem comes when transcoding with ffmpeg (either transcoding to ffv1 or
x264). After transcoding, the file plays incorrectly, with the sound playing
only noise.
We realized that if we start the transcoding a few seconds after the beginning,
the ouput file comes out well.
So, we are assuming the problem is the original file with a messed up timestamp
(?)
The error it gives us is:
Invalid PCM packet, data has size 4 but at least a size of 6 was expected
I've searched the forum but didn't find anything related.
Our command is:
ffmpeg -i
N:\CAPTURES\TELECINE\NITRATS-2019\FFMPEG-AUDIO-CRASH-TEST\ffmpeg\Audio-4K-25p.avi
N:\CAPTURES\TELECINE\NITRATS-2019\FFMPEG-AUDIO-CRASH-TEST\ffmpeg\Audio-4K-25p.mp4
ffmpeg version N-93083-g8522d219ce Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.2.1 (Rev1, Built by MSYS2 project) 20181214
configuration: --disable-autodetect --enable-amf --enable-bzlib
--enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv
--enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --disable-debug
--enable-ffnvcodec --enable-nvdec --enable-libmp3lame --enable-libopus
--enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
--enable-libdav1d --enable-fontconfig --enable-libass --enable-libbluray
--enable-libfreetype --enable-libmfx --enable-libmysofa
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora
--enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc
--enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libzimg
--enable-libshine --enable-gpl --enable-avisynth --enable-libxvid
--enable-libaom --enable-version3 --enable-chromaprint --enable-decklink
--enable-frei0r --enable-libbs2b --enable-libcaca --enable-libcdio
--enable-libfdk-aac --enable-libflite --enable-libfribidi --enable-libgme
--enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmodplug
--enable-libopenh264 --enable-libopenmpt --enable-librtmp
--enable-librubberband --enable-libssh --enable-libtesseract --enable-libxavs
--enable-libzmq --enable-libzvbi --enable-opencl --enable-opengl
--enable-libvmaf --enable-libcodec2 --enable-libsrt --enable-ladspa
--enable-openssl --extra-cflags=-fopenmp --extra-libs=-lgomp
--extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++
--extra-cflags=-DLIBSSH_STATIC
--extra-ldflags='-Wl,--allow-multiple-definition' --extra-cflags=-DCACA_STATIC
--extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCHROMAPRINT_NODLL
--extra-libs=-lstdc++ --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi
--extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
--extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 46.100 / 58. 46.100
libavformat 58. 26.100 / 58. 26.100
libavdevice 58. 6.101 / 58. 6.101
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
[avi @ 000001ba2cae5400] Stream #0: not enough frames to estimate rate;
consider increasing probesize
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, avi, from
'N:\CAPTURES\TELECINE\NITRATS-2019\FFMPEG-AUDIO-CRASH-TEST\ffmpeg\Audio-4K-25p.avi':
Duration: 00:00:05.92, start: 0.000000, bitrate: 4427770 kb/s
Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le, 3840x2160, 25
fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, stereo,
s32 (24 bit), 2304 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (v210 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (pcm_s24le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 000001ba2cb02f00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
AVX FMA3 BMI2 AVX2
[libx264 @ 000001ba2cb02f00] profile High 4:2:2, level 5.1, 4:2:2, 10-bit
[libx264 @ 000001ba2cb02f00] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC
codec - Copyleft 2003-2018 - 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=60 lookahead_threads=10
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=25 scenecut=40 intra_refresh=0
rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=81 qpstep=4
ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to
'N:\CAPTURES\TELECINE\NITRATS-2019\FFMPEG-AUDIO-CRASH-TEST\ffmpeg\Audio-4K-25p.mp4':
Metadata:
encoder : Lavf58.26.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),
yuv422p10le(progressive), 3840x2160, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc58.46.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp
(24 bit), 128 kb/s
Metadata:
encoder : Lavc58.46.100 aac
[pcm_s24le @ 000001ba2cb13b00] Multiple frames in a packet.bitrate=
122.6kbits/s speed= 26x
[pcm_s24le @ 000001ba2cb13b00] Invalid PCM packet, data has size 4 but at least
a size of 6 was expected
Error while decoding stream #0:1: Invalid data found when processing input
[avi @ 000001ba2cae5400] Switching to NI mode, due to poor interleaving
frame= 148 fps=6.0 q=-1.0 Lsize= 13680kB time=00:04:09.89 bitrate=
448.4kbits/s speed=10.1x
video:9715kB audio:3916kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.359518%
[libx264 @ 000001ba2cb02f00] frame I:4 Avg QP:34.57 size:142338
[libx264 @ 000001ba2cb02f00] frame P:40 Avg QP:37.03 size: 81535
[libx264 @ 000001ba2cb02f00] frame B:104 Avg QP:37.50 size: 58813
[libx264 @ 000001ba2cb02f00] consecutive B-frames: 5.4% 1.4% 4.1% 89.2%
[libx264 @ 000001ba2cb02f00] mb I I16..4: 26.7% 65.2% 8.1%
[libx264 @ 000001ba2cb02f00] mb P I16..4: 8.4% 18.6% 1.3% P16..4: 27.4%
7.5% 2.6% 0.0% 0.0% skip:34.3%
[libx264 @ 000001ba2cb02f00] mb B I16..4: 4.1% 4.3% 0.1% B16..8: 38.7%
6.4% 0.7% direct: 3.4% skip:42.4% L0:50.4% L1:48.5% BI: 1.1%
[libx264 @ 000001ba2cb02f00] 8x8 transform intra:60.5% inter:87.4%
[libx264 @ 000001ba2cb02f00] coded y,uvDC,uvAC intra: 38.7% 0.0% 0.0% inter:
19.9% 0.0% 0.0%
[libx264 @ 000001ba2cb02f00] i16 v,h,dc,p: 15% 62% 2% 21%
[libx264 @ 000001ba2cb02f00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 16% 13% 7% 10%
11% 10% 8% 8%
[libx264 @ 000001ba2cb02f00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 17% 10% 8% 11%
11% 7% 6% 4%
[libx264 @ 000001ba2cb02f00] i8c dc,h,v,p: 100% 0% 0% 0%
[libx264 @ 000001ba2cb02f00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 000001ba2cb02f00] ref P L0: 56.6% 24.5% 18.9%
[libx264 @ 000001ba2cb02f00] ref B L0: 72.6% 20.7% 6.8%
We have uploaded a sample file:
https://drive.google.com/file/d/1HirBRHUcqLB_HLtadzp2mbRNZhXsWGit/view?usp=sharing
I apologize the file is 3GB (for only 10 seconds! As it's an uncompressed 4K
file) but we didn't want to modify the file for testing purposes.
We tried using ffmpeg to directly capture from the Decklink using our preferred
archival codec (ffv1) but at 4K it was mission impossible, too many drops even
by increasing the buffer).
Regards
Xavi
Xavier Càmara
Centre de Conservació i Restauració
[cid:[email protected]]
Carretera BV-1274 Km.1 Tel. 93 693 26 54 Ext. 15905
08225 Terrassa Email:
[email protected]<mailto:[email protected]>
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