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Collections - Formulaire de création rapide
19 février 2013, par
Mis à jour : Février 2013
Langue : français
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Why ffmpeg concat results wrong fps ? How to avoid it ?
29 avril 2024, par JinglongI have several mp4 video files and want to concat there video streams into a new mp4 file. The command I used shows below :


ffmpeg -f concat -safe 0 -i concat.txt -an -c:v copy -y out.mp4



The fps of result does not meet expectations.


For example, there are two input wrote in
concat.txt
:

file temp_result_0.mp4
file temp_result_1.mp4







 file 

duration 

number of frames 

fps 

tbr 







 temp_result_0.mp4 

60.0 

1200 

20 

20 




 temp_result_0.mp4 

0.1 

2 

20 

20 




 out.mp4 

60.1 

1202 

19.97 

20 







The
out.mp4
has correctduration
,nb_frames
but wrongavg_frame_rate
(expecting 20 but get 6010/301).

ng01@MacBook-Pro-3 Downloads % ffprobe -select_streams v:0 -show_entries stream=r_frame_rate,avg_frame_rate,nb_frames,duration out.mp4
ffprobe version 7.0 Copyright (c) 2007-2024 the FFmpeg developers
 built with Apple clang version 15.0.0 (clang-1500.3.9.4)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
 libavutil 59. 8.100 / 59. 8.100
 libavcodec 61. 3.100 / 61. 3.100
 libavformat 61. 1.100 / 61. 1.100
 libavdevice 61. 1.100 / 61. 1.100
 libavfilter 10. 1.100 / 10. 1.100
 libswscale 8. 1.100 / 8. 1.100
 libswresample 5. 1.100 / 5. 1.100
 libpostproc 58. 1.100 / 58. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf60.14.100
 Duration: 00:01:00.10, start: 0.000000, bitrate: 1645 kb/s
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1920 [SAR 1:1 DAR 9:16], 1643 kb/s, 19.97 fps, 20 tbr, 10240 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
[STREAM]
r_frame_rate=20/1
avg_frame_rate=6010/301
duration=60.100000
nb_frames=1202
[/STREAM]



I tried use lower version 4.1.3 of ffmpeg, the result has wrong fps and wrong duration. expectation duration is 60.10 but get 60.20


-
first audio lost when using ffmpeg to overlay one mp4 on top of a big mp4
11 septembre 2024, par James HaoI searched a lot (including chatgtp and google), and tried a lot of methods, not work.
below is my ffmpeg command line on windows 10 :


ffmpeg -i video.mp4 -i b-.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS[b1];[1:v]scale=300:-1,setpts=PTS-STARTPTS+0.0/TB[top];[b1][top]overlay=x=50:y=50:enable='between(t\,0.0,5)'[outv];[1:a]adelay=0|0[a1]; [0:a][a1]amerge=inputs=2[outa]" -map "[outv]" -map "[outa]" -pix_fmt yuv420p -c:a aac -ac 2 -c:v libx264 -crf 18 final_video6.mp4



two mp4 files, b-.mp4 should be on top of video.mp4 and play from 0th second and scale to 300 :-1, [0:a][a1]amerge is to merge two audio from the mp4 files, using "-ac 2" to replace pan statement according to enter link description here


in result mp4 file, the audio from video.mp4 is lost ; sometimes with the same instruction, but replace b-.mp4 with another mp4 file, the audio may partially lost. any help will be very appreciated.
below is the console output from ffmpeg :


ffmpeg version 7.0.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
 built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 59. 8.100 / 59. 8.100
 libavcodec 61. 3.100 / 61. 3.100
 libavformat 61. 1.100 / 61. 1.100
 libavdevice 61. 1.100 / 61. 1.100
 libavfilter 10. 1.100 / 10. 1.100
 libswscale 8. 1.100 / 8. 1.100
 libswresample 5. 1.100 / 5. 1.100
 libpostproc 58. 1.100 / 58. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf61.1.100
 Duration: 00:00:09.40, start: 0.000000, bitrate: 72 kb/s
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 854x480, 21 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 encoder : Lavc61.3.100 libx264
 Stream #0:1[0x2](und): Audio: mp3 (mp3float) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 47 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'b-.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf59.27.100
 Duration: 00:00:05.29, start: 0.030000, bitrate: 325 kb/s
 Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 366x132, 196 kb/s, 25.15 fps, 50 tbr, 90k tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #1:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Stream mapping:
 Stream #0:0 (h264) -> setpts:default
 Stream #0:1 (mp3float) -> amerge
 Stream #1:0 (h264) -> scale:default
 Stream #1:1 (aac) -> adelay:default
 overlay:default -> Stream #0:0 (libx264)
 amerge:default -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[Parsed_amerge_5 @ 000002a6613bf100] No channel layout for input 1
[vost#0:0/libx264 @ 000002a6612936c0] No information about the input framerate is available. Falling back to a default value of 25fps. Use the -r option if you want a different framerate.
[libx264 @ 000002a6612b8f40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000002a6612b8f40] profile High, level 3.0, 4:2:0, 8-bit
[libx264 @ 000002a6612b8f40] 264 - core 164 r3191 4613ac3 - H.264/MPEG-4 AVC codec - Copyleft 2003-2024 - 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=15 lookahead_threads=2 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=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'final_video6.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf61.1.100
 Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(progressive), 854x480, q=2-31, 25 fps, 12800 tbn
 Metadata:
 encoder : Lavc61.3.100 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, stereo, fltp, 128 kb/s
 Metadata:
 encoder : Lavc61.3.100 aac
[out#0/mp4 @ 000002a66105e640] video:93KiB audio:78KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 3.974328%
frame= 236 fps=0.0 q=-1.0 Lsize= 178KiB time=00:00:04.97 bitrate= 292.5kbits/s dup=0 drop=46 speed=16.9x
[libx264 @ 000002a6612b8f40] frame I:2 Avg QP: 4.89 size: 4803
[libx264 @ 000002a6612b8f40] frame P:63 Avg QP:14.43 size: 854
[libx264 @ 000002a6612b8f40] frame B:171 Avg QP:12.25 size: 181
[libx264 @ 000002a6612b8f40] consecutive B-frames: 2.1% 1.7% 6.4% 89.8%
[libx264 @ 000002a6612b8f40] mb I I16..4: 86.1% 10.0% 3.8%
[libx264 @ 000002a6612b8f40] mb P I16..4: 0.3% 0.1% 0.3% P16..4: 1.4% 0.6% 0.1% 0.0% 0.0% skip:97.1%
[libx264 @ 000002a6612b8f40] mb B I16..4: 0.0% 0.0% 0.1% B16..8: 1.4% 0.3% 0.0% direct: 0.0% skip:98.1% L0:52.4% L1:39.0% BI: 8.6%
[libx264 @ 000002a6612b8f40] 8x8 transform intra:11.2% inter:13.3%
[libx264 @ 000002a6612b8f40] coded y,uvDC,uvAC intra: 11.2% 12.4% 12.0% inter: 0.2% 0.2% 0.1%
[libx264 @ 000002a6612b8f40] i16 v,h,dc,p: 90% 6% 4% 0%
[libx264 @ 000002a6612b8f40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 3% 67% 0% 0% 0% 0% 0% 1%
[libx264 @ 000002a6612b8f40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 35% 15% 3% 4% 4% 5% 3% 4%
[libx264 @ 000002a6612b8f40] i8c dc,h,v,p: 86% 10% 3% 0%
[libx264 @ 000002a6612b8f40] Weighted P-Frames: Y:1.6% UV:1.6%
[libx264 @ 000002a6612b8f40] ref P L0: 69.2% 3.3% 18.7% 8.8%
[libx264 @ 000002a6612b8f40] ref B L0: 64.6% 31.0% 4.3%
[libx264 @ 000002a6612b8f40] ref B L1: 94.4% 5.6%
[libx264 @ 000002a6612b8f40] kb/s:80.06
[aac @ 000002a6612d0fc0] Qavg: 498.856