[FFmpeg-user] audio is too short
Michael Koch
astroelectronic at t-online.de
Wed Feb 26 17:48:15 EET 2020
Hi,
I'd like to know if someone can reproduce this problem:
Make a 6s video with audio:
ffmpeg -f lavfi -i testsrc2=size=vga -f lavfi -i sine=1000 -t 6 -y video.mp4
The video plays correctly and has 6s of audio.
Now mix the audio channels from two of these input videos:
ffmpeg -i video.mp4 -i video.mp4 -lavfi "[0:a][1:a]amix=weights='1.0
0.1'" -y out.mp4
You can hear that the audio from the first input ends too early at 4s,
and the audio from the second input has the correct length 6s.
Tested with FFplay and VLC.
Known workaround: add -c:v mpeg4
This is ticket 8489, but so far nobody did have a look at it.
Michael
C:\Users\mKoch\Desktop>c:\ffmpeg\ffmpeg -f lavfi -i testsrc2=size=vga -f
lavfi -
i sine=1000 -t 6 -y video.mp4
ffmpeg version git-2020-02-25-36451f9 Copyright (c) 2000-2020 the FFmpeg
develop
ers
built with gcc 9.2.1 (GCC) 20200122
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfi
g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d
--enable-libb
luray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-libshine --e
nable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame
--enable
-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
--enable-libx265 -
-enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
--enable-gmp --enab
le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --en
able-libspeex --enable-libxvid --enable-libaom --enable-libmfx
--enable-ffnvcode
c --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc
--enable-nvd
ec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 42.100 / 56. 42.100
libavcodec 58. 73.102 / 58. 73.102
libavformat 58. 39.101 / 58. 39.101
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 77.100 / 7. 77.100
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, lavfi, from 'testsrc2=size=vga':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480
[SAR 1:1
DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Input #1, lavfi, from 'sine=1000':
Duration: N/A, start: 0.000000, bitrate: 705 kb/s
Stream #1:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 00000000001bee80] using SAR=1/1
[libx264 @ 00000000001bee80] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
AVX FMA3 BMI2 AVX2
[libx264 @ 00000000001bee80] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 00000000001bee80] 264 - core 159 - H.264/MPEG-4 AVC codec -
Copyleft
2003-2019 - 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_rang
e=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1
chroma_qp_
offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
interla
ced=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 qpma
x=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'video.mp4':
Metadata:
encoder : Lavf58.39.101
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),
yuv420p(progressive)
, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc58.73.102 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 69 k
b/s
Metadata:
encoder : Lavc58.73.102 aac
frame= 103 fps=0.0 q=28.0 size= 0kB time=00:00:02.02 bitrate=
0.2kbits/
frame= 150 fps=128 q=-1.0 Lsize= 690kB time=00:00:06.01 bitrate=
940.0kbits
/s speed=5.14x
video:633kB audio:51kB subtitle:0kB other streams:0kB global headers:0kB
muxing
overhead: 0.899108%
[libx264 @ 00000000001bee80] frame I:1 Avg QP:21.21 size: 9168
[libx264 @ 00000000001bee80] frame P:46 Avg QP:26.76 size: 5209
[libx264 @ 00000000001bee80] frame B:103 Avg QP:30.60 size: 3875
[libx264 @ 00000000001bee80] consecutive B-frames: 1.3% 10.7% 32.0% 56.0%
[libx264 @ 00000000001bee80] mb I I16..4: 25.0% 62.2% 12.8%
[libx264 @ 00000000001bee80] mb P I16..4: 1.5% 6.0% 1.0% P16..4:
9.3% 5.3
% 2.9% 0.0% 0.0% skip:74.1%
[libx264 @ 00000000001bee80] mb B I16..4: 0.2% 0.4% 0.5% B16..8:
13.8% 4.2
% 1.0% direct: 1.7% skip:78.3% L0:50.3% L1:42.7% BI: 7.0%
[libx264 @ 00000000001bee80] 8x8 transform intra:63.2% inter:22.1%
[libx264 @ 00000000001bee80] coded y,uvDC,uvAC intra: 16.1% 23.3% 22.4%
inter: 4
.2% 8.7% 7.4%
[libx264 @ 00000000001bee80] i16 v,h,dc,p: 70% 23% 6% 1%
[libx264 @ 00000000001bee80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 15% 73%
0% 0%
0% 0% 0% 0%
[libx264 @ 00000000001bee80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 22% 31%
6% 3%
4% 3% 5% 3%
[libx264 @ 00000000001bee80] i8c dc,h,v,p: 69% 11% 19% 1%
[libx264 @ 00000000001bee80] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000000001bee80] ref P L0: 55.3% 6.9% 23.3% 14.5%
[libx264 @ 00000000001bee80] ref B L0: 71.5% 23.5% 5.0%
[libx264 @ 00000000001bee80] ref B L1: 93.0% 7.0%
[libx264 @ 00000000001bee80] kb/s:863.86
[aac @ 00000000032a88c0] Qavg: 19623.219
C:\Users\mKoch\Desktop>c:\ffmpeg\ffmpeg -i video.mp4 -i video.mp4 -lavfi
"[0:a][
1:a]amix=weights='1.0 0.1'" -y out.mp4
ffmpeg version git-2020-02-25-36451f9 Copyright (c) 2000-2020 the FFmpeg
develop
ers
built with gcc 9.2.1 (GCC) 20200122
configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-fontconfi
g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d
--enable-libb
luray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-libshine --e
nable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame
--enable
-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
--enable-libx265 -
-enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
--enable-gmp --enab
le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc
--enable-libmysofa --en
able-libspeex --enable-libxvid --enable-libaom --enable-libmfx
--enable-ffnvcode
c --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc
--enable-nvd
ec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 42.100 / 56. 42.100
libavcodec 58. 73.102 / 58. 73.102
libavformat 58. 39.101 / 58. 39.101
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 77.100 / 7. 77.100
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.39.101
Duration: 00:00:06.02, start: 0.000000, bitrate: 938 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
640x480 [
SAR 1:1 DAR 4:3], 864 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
mono, fltp,
68 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.39.101
Duration: 00:00:06.02, start: 0.000000, bitrate: 938 kb/s
Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
640x480 [
SAR 1:1 DAR 4:3], 864 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
mono, fltp,
68 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:1 (aac) -> amix:input0 (graph 0)
Stream #1:1 (aac) -> amix:input1 (graph 0)
amix (graph 0) -> Stream #0:0 (aac)
Stream #0:0 -> #0:1 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 00000000004de280] using SAR=1/1
[libx264 @ 00000000004de280] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
AVX FMA3 BMI2 AVX2
[libx264 @ 00000000004de280] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 00000000004de280] 264 - core 159 - H.264/MPEG-4 AVC codec -
Copyleft
2003-2019 - 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_rang
e=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1
chroma_qp_
offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
interla
ced=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 qpma
x=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'out.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.39.101
Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 69 k
b/s (default)
Metadata:
encoder : Lavc58.73.102 aac
Stream #0:1(und): Video: h264 (libx264) (avc1 / 0x31637661),
yuv420p, 640x48
0 [SAR 1:1 DAR 4:3], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.73.102 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame= 95 fps=0.0 q=28.0 size= 0kB time=00:00:01.69 bitrate=
0.2kbits/
frame= 150 fps=130 q=-1.0 Lsize= 661kB time=00:00:06.01 bitrate=
900.9kbits
/s speed=5.21x
video:612kB audio:43kB subtitle:0kB other streams:0kB global headers:0kB
muxing
overhead: 0.942758%
[aac @ 0000000002990a40] Qavg: 25713.752
[libx264 @ 00000000004de280] frame I:1 Avg QP:18.28 size: 9171
[libx264 @ 00000000004de280] frame P:47 Avg QP:25.28 size: 5109
[libx264 @ 00000000004de280] frame B:102 Avg QP:29.85 size: 3690
[libx264 @ 00000000004de280] consecutive B-frames: 2.0% 13.3% 26.0% 58.7%
[libx264 @ 00000000004de280] mb I I16..4: 45.2% 42.3% 12.5%
[libx264 @ 00000000004de280] mb P I16..4: 1.5% 5.5% 0.8% P16..4:
11.1% 5.0
% 2.8% 0.0% 0.0% skip:73.3%
[libx264 @ 00000000004de280] mb B I16..4: 0.2% 0.1% 0.5% B16..8:
14.1% 3.7
% 0.9% direct: 1.7% skip:78.6% L0:49.5% L1:44.3% BI: 6.2%
[libx264 @ 00000000004de280] 8x8 transform intra:56.4% inter:25.6%
[libx264 @ 00000000004de280] coded y,uvDC,uvAC intra: 19.1% 27.7% 26.1%
inter: 4
.0% 9.1% 7.5%
[libx264 @ 00000000004de280] i16 v,h,dc,p: 71% 19% 8% 1%
[libx264 @ 00000000004de280] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 12% 75%
0% 0%
0% 0% 0% 0%
[libx264 @ 00000000004de280] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 22% 33%
7% 3%
4% 4% 6% 4%
[libx264 @ 00000000004de280] i8c dc,h,v,p: 71% 11% 17% 2%
[libx264 @ 00000000004de280] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000000004de280] ref P L0: 56.9% 7.7% 22.6% 12.9%
[libx264 @ 00000000004de280] ref B L0: 74.2% 21.4% 4.4%
[libx264 @ 00000000004de280] ref B L1: 94.6% 5.4%
[libx264 @ 00000000004de280] kb/s:834.26
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