[FFmpeg-trac] #8489(ffmpeg:new): MP4 file has too short audio
FFmpeg
trac at avcodec.org
Mon Jan 20 00:08:05 EET 2020
#8489: MP4 file has too short audio
--------------------------------+--------------------------------------
Reporter: mkoch | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
--------------------------------+--------------------------------------
Summary of the bug:
How to reproduce:
Step 1: Make a 6 seconds test video with 1kHz tone. The file is ok when
played.
ffmpeg -f lavfi -i testsrc2=size=vga -f lavfi -i sine=1000 -t 6 -y
video.mp4
Step 2: Make a 10 seconds audio file with silence and a short 3kHz tone at
t=3s. The file is ok when played.
ffmpeg -f lavfi -i "sine=3000:duration=0.1" -af adelay=3000,apad -t 10 -y
audio.wav
Step 3: Combine both files into one video, and the audio sources shall be
mixed:
ffmpeg -i video.mp4 -i audio.wav -filter_complex
"[0:a][1:a]amix=weights='1.0 1.0'" -shortest -y out.mp4
The output video has the correct length 6s, but unexpectedly the audio
length is only 4s. The last 2s are silence.
Known workarounds to solve the problem: add -c:v mpeg4, or use out.nut as
output filename
Below is the console output for step 3:
F:\Test_Audio>c:\ffmpeg\ffmpeg -i video.mp4 -i audio.wav -filter_complex
"[0:a][
1:a]amix=weights='1.0 1.0'" -shortest -y out.mp4
ffmpeg version git-2020-01-15-0dc0837 Copyright (c) 2000-2020 the FFmpeg
develop
ers
built with gcc 9.2.1 (GCC) 20200111
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-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-
dxva2 -
-enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 65.103 / 58. 65.103
libavformat 58. 35.102 / 58. 35.102
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 71.100 / 7. 71.100
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 : Lavf58.35.102
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
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, wav, from 'audio.wav':
Metadata:
encoder : Lavf58.35.102
Duration: 00:00:10.00, bitrate: 705 kb/s
Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono,
s16,
705 kb/s
Stream mapping:
Stream #0:1 (aac) -> amix:input0 (graph 0)
Stream #1:0 (pcm_s16le) -> 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 @ 00000000029d7540] using SAR=1/1
[libx264 @ 00000000029d7540] using cpu capabilities: MMX2 SSE2Fast SSSE3
SSE4.2
AVX FMA3 BMI2 AVX2
[libx264 @ 00000000029d7540] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 00000000029d7540] 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 : Lavf58.35.102
Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono,
fltp, 69 k
b/s (default)
Metadata:
encoder : Lavc58.65.103 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 : Lavc58.65.103 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame= 111 fps=0.0 q=28.0 size= 256kB time=00:00:02.36 bitrate=
885.6kbits/
frame= 150 fps=141 q=-1.0 Lsize= 635kB time=00:00:06.01 bitrate=
864.7kbits
/s speed=5.66x
video:612kB audio:17kB subtitle:0kB other streams:0kB global headers:0kB
muxing
overhead: 0.982628%
[aac @ 00000000029dbb40] Qavg: 62202.113
[libx264 @ 00000000029d7540] frame I:1 Avg QP:18.28 size: 9171
[libx264 @ 00000000029d7540] frame P:47 Avg QP:25.28 size: 5109
[libx264 @ 00000000029d7540] frame B:102 Avg QP:29.85 size: 3690
[libx264 @ 00000000029d7540] consecutive B-frames: 2.0% 13.3% 26.0% 58.7%
[libx264 @ 00000000029d7540] mb I I16..4: 45.2% 42.3% 12.5%
[libx264 @ 00000000029d7540] 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 @ 00000000029d7540] 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 @ 00000000029d7540] 8x8 transform intra:56.4% inter:25.6%
[libx264 @ 00000000029d7540] coded y,uvDC,uvAC intra: 19.1% 27.7% 26.1%
inter: 4
.0% 9.1% 7.5%
[libx264 @ 00000000029d7540] i16 v,h,dc,p: 71% 19% 8% 1%
[libx264 @ 00000000029d7540] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 12% 75%
0% 0%
0% 0% 0% 0%
[libx264 @ 00000000029d7540] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 22% 33%
7% 3%
4% 4% 6% 4%
[libx264 @ 00000000029d7540] i8c dc,h,v,p: 71% 11% 17% 2%
[libx264 @ 00000000029d7540] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000000029d7540] ref P L0: 56.9% 7.7% 22.6% 12.9%
[libx264 @ 00000000029d7540] ref B L0: 74.2% 21.4% 4.4%
[libx264 @ 00000000029d7540] ref B L1: 94.6% 5.4%
[libx264 @ 00000000029d7540] kb/s:834.26
--
Ticket URL: <https://trac.ffmpeg.org/ticket/8489>
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