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FFmpeg not cropping video correctly
7 avril 2022, par user973254I'm using ffmpeg as :


ffmpeg -i "video.webm" -c:v libx264 -vf "crop=in_w:in_h:in_w/2:in_h" -ss 00:02:56.000 -to 00:03:02.750 cut.mp4 -y


to get left side of screen to crop out right one, but in result I'm getting uncropped video (both sides present), when I change command to get right side (to crop out left one) :


ffmpeg -i "video.webm" -c:v libx264 -vf "crop=in_w/2:in_h:in_w:in_h" -ss 00:2:56.000 -to 00:03:02.750 cut.mp4 -y


everything works as it should (only right side of original video presents in "cut.mp4").


What am I doing wrong ?


P.S.


ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
 built with gcc 11.2.1 (Gentoo 11.2.1_p20220115 p4) 20220115
 configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/share/doc/ffmpeg-4.4.1-r5/html --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --nm=x86_64-pc-linux-gnu-nm --strip=x86_64-pc-linux-gnu-strip --ranlib=x86_64-pc-linux-gnu-ranlib --pkg-config=x86_64-pc-linux-gnu-pkg-config --optflags='-march=native -O2 -pipe' --extra-libs= --disable-static --enable-avfilter --enable-avresample --disable-stripping --disable-optimizations --disable-libcelt --enable-nonfree --disable-indev=v4l2 --disable-outdev=v4l2 --disable-indev=alsa --disable-indev=oss --disable-indev=jack --disable-indev=sndio --disable-outdev=alsa --disable-outdev=oss --disable-outdev=sndio --enable-version3 --enable-bzlib --enable-runtime-cpudetect --disable-debug --disable-gcrypt --enable-gnutls --enable-gmp --enable-gpl --disable-hardcoded-tables --enable-iconv --disable-libxml2 --enable-lzma --enable-network --disable-opencl --enable-openssl --enable-postproc --disable-libsmbclient --disable-ffplay --disable-sdl2 --disable-vaapi --disable-vdpau --disable-vulkan --disable-xlib --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --disable-opengl --disable-libv4l2 --disable-libpulse --disable-libdrm --disable-libjack --disable-libopencore-amrwb --disable-libopencore-amrnb --disable-libcodec2 --enable-libdav1d --disable-libfdk-aac --disable-libopenjpeg --disable-libbluray --disable-libgme --disable-libgsm --disable-libaribb24 --disable-mmal --disable-libmodplug --disable-libopus --disable-libilbc --disable-librtmp --disable-libssh --disable-libspeex --disable-libsrt --enable-librsvg --disable-ffnvcodec --disable-libvorbis --disable-libvpx --disable-libzvbi --disable-appkit --disable-libbs2b --disable-chromaprint --disable-cuda-llvm --disable-libflite --disable-frei0r --disable-libvmaf --disable-libfribidi --disable-fontconfig --disable-ladspa --disable-libass --disable-libtesseract --disable-lv2 --enable-libfreetype --disable-libvidstab --disable-librubberband --disable-libzmq --disable-libzimg --disable-libsoxr --enable-pthreads --disable-amf --disable-libvo-amrwbenc --disable-libkvazaar --disable-libaom --disable-libmp3lame --disable-libopenh264 --disable-librav1e --disable-libsnappy --disable-libsvtav1 --disable-libtheora --disable-libtwolame --enable-libwebp --enable-libx264 --disable-libx265 --disable-libxvid --disable-gnutls --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-neon --disable-vfp --disable-vfpv3 --disable-armv8 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-altivec --disable-vsx --disable-power8 --disable-amd3dnow --disable-amd3dnowext --disable-fma3 --disable-fma4 --disable-xop --cpu=host --disable-doc --disable-htmlpages --enable-manpages
 libavutil 56. 70.100 / 56. 70.100
 libavcodec 58.134.100 / 58.134.100
 libavformat 58. 76.100 / 58. 76.100
 libavdevice 58. 13.100 / 58. 13.100
 libavfilter 7.110.100 / 7.110.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 9.100 / 5. 9.100
 libswresample 3. 9.100 / 3. 9.100
 libpostproc 55. 9.100 / 55. 9.100
Input #0, matroska,webm, from 'video.webm':
 Metadata:
 ENCODER : Lavf58.76.100
 Duration: 00:36:29.58, start: -0.007000, bitrate: 1066 kb/s
 Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 1920x1080, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
 Metadata:
 DURATION : 00:36:29.560000000
 Stream #0:1(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
 Metadata:
 DURATION : 00:36:29.581000000
Stream mapping:
 Stream #0:0 -> #0:0 (vp9 (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (opus (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x564b4eda52c0] using SAR=1/1
[libx264 @ 0x564b4eda52c0] using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX
[libx264 @ 0x564b4eda52c0] profile Progressive High, level 4.0, 4:2:0, 8-bit
[libx264 @ 0x564b4eda52c0] 264 - core 157 - 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_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=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'cut.mp4':
 Metadata:
 encoder : Lavf58.76.100
 Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 12800 tbn (default)
 Metadata:
 DURATION : 00:36:29.560000000
 encoder : Lavc58.134.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 DURATION : 00:36:29.581000000
 encoder : Lavc58.134.100 aac
frame= 169 fps= 28 q=-1.0 Lsize= 851kB time=00:00:06.74 bitrate=1033.9kbits/s speed=1.12x
video:738kB audio:106kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.764865%
[libx264 @ 0x564b4eda52c0] frame I:1 Avg QP:14.29 size: 31413
[libx264 @ 0x564b4eda52c0] frame P:43 Avg QP:16.65 size: 9476
[libx264 @ 0x564b4eda52c0] frame B:125 Avg QP:22.36 size: 2529
[libx264 @ 0x564b4eda52c0] consecutive B-frames: 1.2% 0.0% 1.8% 97.0%
[libx264 @ 0x564b4eda52c0] mb I I16..4: 31.6% 63.8% 4.6%
[libx264 @ 0x564b4eda52c0] mb P I16..4: 1.4% 5.4% 0.3% P16..4: 13.8% 3.2% 1.0% 0.0% 0.0% skip:75.0%
[libx264 @ 0x564b4eda52c0] mb B I16..4: 0.1% 0.2% 0.0% B16..8: 11.4% 0.7% 0.1% direct: 0.4% skip:87.0% L0:48.2% L1:48.1% BI: 3.7%
[libx264 @ 0x564b4eda52c0] 8x8 transform intra:73.0% inter:90.2%
[libx264 @ 0x564b4eda52c0] coded y,uvDC,uvAC intra: 38.9% 41.7% 6.4% inter: 2.2% 2.7% 0.0%
[libx264 @ 0x564b4eda52c0] i16 v,h,dc,p: 45% 18% 5% 31%
[libx264 @ 0x564b4eda52c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 20% 22% 5% 6% 7% 5% 7% 5%
[libx264 @ 0x564b4eda52c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 22% 14% 6% 10% 8% 7% 5% 3%
[libx264 @ 0x564b4eda52c0] i8c dc,h,v,p: 55% 19% 19% 6%
[libx264 @ 0x564b4eda52c0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x564b4eda52c0] ref P L0: 67.6% 9.2% 16.0% 7.3%
[libx264 @ 0x564b4eda52c0] ref B L0: 88.6% 9.5% 1.9%
[libx264 @ 0x564b4eda52c0] ref B L1: 97.3% 2.7%
[libx264 @ 0x564b4eda52c0] kb/s:893.47
[aac @ 0x564b4edde600] Qavg: 208.505


-
FFMPEG atempo introducing phasing for multichannel mono audio tracks
27 septembre 2021, par BrainNoWerkIs this a bug, or expected behaviour ? When converting materials from PAL to NTSC I invoke atempo as follows :


-map 0:a:? -af atempo=24000/25025 ^
-c:a pcm_s24le


I use this in a windows batch file (hence the caret) as a catch-all for all files that need to be converted, not having to deal with how many audio channels might be present or in what order.


However, when my input was a broadcast MXF with 10channel mono audio (1 per stream) it introduced wild phasing between the tracks.


Merging the tracks into a single stream to be processed by atempo resulted in no phasing.


-filter_complex "[0:a:0][0:a:1][0:a:2][0:a:3][0:a:4][0:a:5][0:a:6][0:a:7][0:a:8][0:a:9] amerge=inputs=10, atempo=24000/25025[FRC]" ^
-map "[FRC]" -c:a pcm_s24le


Is this expected behaviour ? I can't see any documentation detailing the need to first use amerge before invoking atempo.


If indeed this step is necessary, is there a way to "wildcard" the amerge operation so that I don't have to manually enter all the audio channels, and then the "inputs=" ? This would allow me to make it more universal.


This is my first question on stack overflow, so please be gentle. I've come here to find so many answers to my FFMPEG questions in the past—but this seems to be an edge case I can't get much detail on.


Thanks !


EDIT :


This output using the wildcard produces phasing :


C:\Windows>ffmpeg -ss 00:05:13.0 -r 24000/1001 -i "\\bdfs11\array21\Eps101_1920x1080_20_51_DV_CC_25fps_20210622.mov" -t 00:00:22.0 -map 0:v:0 -c:v mpeg2video -profile:v 0 -level:v 2 -b:v 50000k -minrate 50000k -maxrate 50000k -pix_fmt yuv422p -vtag xd5d -force_key_frames "expr:gte(t,n_forced*1)" -streamid 0:481 -streamid 1:129 -map 0:a:? -af atempo=24000/25025 -c:a pcm_s24le "R:\2_SERIES\%~n1_25to23976_works.%Container%" -y
ffmpeg version N-94566-gddd92ba2c6 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.1.1 (GCC) 20190807
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-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 --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 libavutil 56. 33.100 / 56. 33.100
 libavcodec 58. 55.100 / 58. 55.100
 libavformat 58. 30.100 / 58. 30.100
 libavdevice 58. 9.100 / 58. 9.100
 libavfilter 7. 58.100 / 7. 58.100
 libswscale 5. 6.100 / 5. 6.100
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 06ea4cc0] Could not find codec parameters for stream 12 (Subtitle: none (c708 / 0x38303763), 1920x1080, 21 kb/s): unknown codec
 Consider increasing the value for the 'analyzeduration' and 'probesize' options
 Guessed Channel Layout for Input Stream #0.2 : mono
 Guessed Channel Layout for Input Stream #0.3 : mono
 Guessed Channel Layout for Input Stream #0.4 : mono
 Guessed Channel Layout for Input Stream #0.5 : mono
 Guessed Channel Layout for Input Stream #0.6 : mono
 Guessed Channel Layout for Input Stream #0.7 : mono
 Guessed Channel Layout for Input Stream #0.8 : mono
 Guessed Channel Layout for Input Stream #0.9 : mono
 Guessed Channel Layout for Input Stream #0.10 : mono
 Guessed Channel Layout for Input Stream #0.11 : mono
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '\\bdfs11\array21\Eps101_1920x1080_20_51_DV_CC_25fps_20210622.mov':
 Metadata:
 major_brand : qt
 minor_version : 537199360
 compatible_brands: qt
 creation_time : 2021-06-22T17:39:50.000000Z
 Duration: 00:59:08.16, start: 0.000000, bitrate: 217983 kb/s
 Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(tv, bt709, progressive), 1920x1080, 206438 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Video Media Handler
 encoder : Apple ProRes 422 HQ
 timecode : 00:59:59:00
 Stream #0:1(eng): Data: none (tmcd / 0x64636D74) (default)
 Metadata:
 rotate : 0
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Time Code Media Handler
 reel_name : untitled
 timecode : 00:59:59:00
 Stream #0:2(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:3(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:4(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:5(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:6(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:7(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:8(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:9(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:10(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:11(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:12(eng): Subtitle: none (c708 / 0x38303763), 1920x1080, 21 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Closed Caption Media Handler
 Stream mapping:
 Stream #0:0 -> #0:0 (prores (native) -> mpeg2video (native))
 Stream #0:2 -> #0:1 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:3 -> #0:2 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:4 -> #0:3 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:5 -> #0:4 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:6 -> #0:5 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:7 -> #0:6 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:8 -> #0:7 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:9 -> #0:8 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:10 -> #0:9 (pcm_s24le (native) -> pcm_s24le (native))
 Stream #0:11 -> #0:10 (pcm_s24le (native) -> pcm_s24le (native))
 Press [q] to stop, [?] for help
 [mpeg2video @ 06f8aa40] Automatically choosing VBV buffer size of 746 kbyte
 Output #0, mxf, to 'R:\2_SERIES\Eps101_1920x1080_20_51_DV_CC_25fps_20210622_25to23976_works.mxf':
 Metadata:
 major_brand : qt
 minor_version : 537199360
 compatible_brands: qt
 encoder : Lavf58.30.100
 Stream #0:0(eng): Video: mpeg2video (4:2:2) (xd5d / 0x64356478), yuv422p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 50000 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Video Media Handler
 timecode : 00:59:59:00
 encoder : Lavc58.55.100 mpeg2video
 Side data:
 cpb: bitrate max/min/avg: 50000000/50000000/50000000 buffer size: 6111232 vbv_delay: 18446744073709551615
 Stream #0:1(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:2(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:3(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:4(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:5(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:6(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:7(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:8(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:9(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 Stream #0:10(eng): Audio: pcm_s24le, 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 encoder : Lavc58.55.100 pcm_s24le
 frame= 527 fps= 52 q=2.0 Lsize= 166106kB time=00:00:22.00 bitrate=61851.7kbits/s speed=2.19x
 video:133971kB audio:30938kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.726204%


This is the output that produces no phasing


C:\Windows>ffmpeg -ss 00:05:13.0 -r 24000/1001 -i "\\bdfs11\array21\Eps101_1920x1080_20_51_DV_CC_25fps_20210622.mov" -t 00:00:22.0 -map 0:v:0 -c:v mpeg2video -profile:v 0 -level:v 2 -b:v 50000k -minrate 50000k -maxrate 50000k -pix_fmt yuv422p -vtag xd5d -force_key_frames "expr:gte(t,n_forced*1)" -streamid 0:481 -streamid 1:129 -filter_complex "[0:a:0][0:a:1][0:a:2][0:a:3][0:a:4][0:a:5][0:a:6][0:a:7][0:a:8][0:a:9] amerge=inputs=10, atempo=24000/25025[FRC]" -map "[FRC]" -c:a pcm_s24le "R:\2_SERIES\Eps101_1920x1080_20_51_DV_CC_25fps_20210622_25to23976_works.mxf" -y
ffmpeg version N-94566-gddd92ba2c6 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.1.1 (GCC) 20190807
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-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 --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
 libavutil 56. 33.100 / 56. 33.100
 libavcodec 58. 55.100 / 58. 55.100
 libavformat 58. 30.100 / 58. 30.100
 libavdevice 58. 9.100 / 58. 9.100
 libavfilter 7. 58.100 / 7. 58.100
 libswscale 5. 6.100 / 5. 6.100
 libswresample 3. 6.100 / 3. 6.100
 libpostproc 55. 6.100 / 55. 6.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 064f5580] Could not find codec parameters for stream 12 (Subtitle: none (c708 / 0x38303763), 1920x1080, 21 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Guessed Channel Layout for Input Stream #0.2 : mono
Guessed Channel Layout for Input Stream #0.3 : mono
Guessed Channel Layout for Input Stream #0.4 : mono
Guessed Channel Layout for Input Stream #0.5 : mono
Guessed Channel Layout for Input Stream #0.6 : mono
Guessed Channel Layout for Input Stream #0.7 : mono
Guessed Channel Layout for Input Stream #0.8 : mono
Guessed Channel Layout for Input Stream #0.9 : mono
Guessed Channel Layout for Input Stream #0.10 : mono
Guessed Channel Layout for Input Stream #0.11 : mono
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '\\bdfs11\array21\Eps101_1920x1080_20_51_DV_CC_25fps_20210622.mov':
 Metadata:
 major_brand : qt
 minor_version : 537199360
 compatible_brands: qt
 creation_time : 2021-06-22T17:39:50.000000Z
 Duration: 00:59:08.16, start: 0.000000, bitrate: 217983 kb/s
 Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(tv, bt709, progressive), 1920x1080, 206438 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Video Media Handler
 encoder : Apple ProRes 422 HQ
 timecode : 00:59:59:00
 Stream #0:1(eng): Data: none (tmcd / 0x64636D74) (default)
 Metadata:
 rotate : 0
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Time Code Media Handler
 reel_name : untitled
 timecode : 00:59:59:00
 Stream #0:2(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:3(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:4(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:5(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:6(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:7(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:8(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:9(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:10(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:11(eng): Audio: pcm_s24le (lpcm / 0x6D63706C), 48000 Hz, mono, s32 (24 bit), 1152 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Sound Media Handler
 Stream #0:12(eng): Subtitle: none (c708 / 0x38303763), 1920x1080, 21 kb/s (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Closed Caption Media Handler
Stream mapping:
 Stream #0:2 (pcm_s24le) -> amerge:in0 (graph 0)
 Stream #0:3 (pcm_s24le) -> amerge:in1 (graph 0)
 Stream #0:4 (pcm_s24le) -> amerge:in2 (graph 0)
 Stream #0:5 (pcm_s24le) -> amerge:in3 (graph 0)
 Stream #0:6 (pcm_s24le) -> amerge:in4 (graph 0)
 Stream #0:7 (pcm_s24le) -> amerge:in5 (graph 0)
 Stream #0:8 (pcm_s24le) -> amerge:in6 (graph 0)
 Stream #0:9 (pcm_s24le) -> amerge:in7 (graph 0)
 Stream #0:10 (pcm_s24le) -> amerge:in8 (graph 0)
 Stream #0:11 (pcm_s24le) -> amerge:in9 (graph 0)
 Stream #0:0 -> #0:0 (prores (native) -> mpeg2video (native))
 atempo (graph 0) -> Stream #0:1 (pcm_s24le)
Press [q] to stop, [?] for help
[Parsed_amerge_0 @ 06e18dc0] No channel layout for input 1
[Parsed_amerge_0 @ 06e18dc0] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
[mpeg2video @ 06dea000] Automatically choosing VBV buffer size of 746 kbyte
Output #0, mxf, to 'R:\2_SERIES\Eps101_1920x1080_20_51_DV_CC_25fps_20210622_25to23976_works.mxf':
 Metadata:
 major_brand : qt
 minor_version : 537199360
 compatible_brands: qt
 encoder : Lavf58.30.100
 Stream #0:0(eng): Video: mpeg2video (4:2:2) (xd5d / 0x64356478), yuv422p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 50000 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default)
 Metadata:
 creation_time : 2021-06-22T17:39:50.000000Z
 handler_name : Apple Video Media Handler
 timecode : 00:59:59:00
 encoder : Lavc58.55.100 mpeg2video
 Side data:
 cpb: bitrate max/min/avg: 50000000/50000000/50000000 buffer size: 6111232 vbv_delay: 18446744073709551615
 Stream #0:1: Audio: pcm_s24le, 48000 Hz, 10 channels (FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL), s32, 11520 kb/s (default)
 Metadata:
 encoder : Lavc58.55.100 pcm_s24le
frame= 527 fps= 61 q=2.0 Lsize= 165571kB time=00:00:22.00 bitrate=61652.6kbits/s speed=2.56x
video:133971kB audio:30938kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.402084%


Let me know if you need more detail than what I've provided.


Tangential questions related to this job and potentially not worth their own thread, even though I've looked extensively and not found the answers (happy to post them individually if that's necessary) :


- 

-
I can't seem to split any portion of the filter_complex above with a caret (^) within a windows batch file (no number of spaces before or after resolve this issue). It breaks the chain and the filter graphs complain of no input.


-
Is FFMBC still the only way to include broadcast closed captioning ? This functionality doesn't exist within FFMPEG ?








-
-
FFMPEG Api conversion from YUV420P to RGB produces strange output
20 novembre 2024, par fasc8I'm using the FFMPEG Api in Rust to get RGB images from video files.


While some videos work correct and I get the frames back as expected, some work not. Or at least the result is not the way I expected it to be.


The code I use in Rust :


ffmpeg::init().unwrap();

let in_ctx = input(&Path::new(source)).unwrap();
let input = in_ctx
 .streams()
 .best(Type::Video)
 .ok_or(ffmpeg::Error::StreamNotFound)?;

let decoder = input.codec().decoder().video()?;

let scaler = Context::get(
 decoder.format(),
 decoder.width(),
 decoder.height(),
 Pixel::RGB24,
 decoder.width(),
 decoder.height(),
 Flags::FULL_CHR_H_INT | Flags::ACCURATE_RND,
)?; // <--- Is basically sws_getContext

// later to get the actual frame
let mut decoded = Video::empty();
if self.decoder.receive_frame(&mut decoded).is_ok() {
 let mut rgb_frame = Video::empty();
 self.scaler.run(&decoded, &mut rgb_frame)?; // <--- Does sws_scale
 println!("Converted Pixel Format: {}", rgb_frame.format() as i32);
 Ok(Some(rgb_frame))
}


Which should roughly translate to C like so :


// Get the context and video stream
SwsContext * ctx = sws_getContext(imgWidth, imgHeight,
 imgFormat, imgWidth, imgHeight,
 AV_PIX_FMT_RGB24, 0, 0, 0, 0);
sws_scale(ctx, decoded.data, decoded.linesize, 0, decoded.height, rgb_frame.data, rbg_frame.linesize);


And like I said earlier, sometimes it works fine and I get the expected frame back. But sometimes I get something like this :
Weird result image


I saved the images as .ppm files for quick visual comparison. I used this method, which basically writes the bytes to a file with a simple .ppm header :


fn save_file(frame: &Video, index: usize) -> std::result::Result<(), std::io::Error> 
{
 let mut file = File::create(format!("frame{}.ppm", index))?;
 file.write_all(format!("P6\n{} {}\n255\n", frame.width(), frame.height()).as_bytes())?;
 file.write_all(frame.data(0))?;
 Ok(())
}


Here you can see that on the left side there is a good image result vs. on the right side there is a bad image result.
Comparison of the .ppm files


To come to the question now :


Why is this happening. I tested everything on my side and the only thing left is ffmpeg conversion. FFMPEG seems to convert these two test files differently even though it reports YUV420P as format for both. I cannot figure out what the difference may be...


Here the info for the two video files i used :


Good video file :


General
Complete name : /mnt/smb/Snapchat-174933781.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 1.90 MiB
Duration : 9 s 612 ms
Overall bit rate : 1 661 kb/s
Encoded date : UTC 2021-07-28 22:09:36
Tagged date : UTC 2021-07-28 22:09:36
eng : -180.00

Video
ID : 512
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings : CABAC / 1 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 9 s 598 ms
Bit rate : 1 597 kb/s
Width : 480 pixels
Height : 944 pixels
Display aspect ratio : 0.508
Frame rate mode : Variable
Frame rate : 29.797 FPS
Minimum frame rate : 15.000 FPS
Maximum frame rate : 30.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.118
Stream size : 1.83 MiB (96%)
Title : Snap Video
Language : English
Encoded date : UTC 2021-07-28 22:09:36
Tagged date : UTC 2021-07-28 22:09:36
Color range : Full
colour_range_Original : Limited
Color primaries : BT.709
Transfer characteristics : BT.601
transfer_characteristics_Original : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC

Audio
ID : 256
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 9 s 612 ms
Bit rate mode : Constant
Bit rate : 62.0 kb/s
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 73.3 KiB (4%)
Title : Snap Audio
Language : English
Encoded date : UTC 2021-07-28 22:09:36
Tagged date : UTC 2021-07-28 22:09:36


Bad video file :


General
Complete name : /mnt/smb/Snapchat-1989594918.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42 (isom/mp42)
File size : 2.97 MiB
Duration : 6 s 313 ms
Overall bit rate : 3 948 kb/s
Encoded date : UTC 2019-07-11 06:43:04
Tagged date : UTC 2019-07-11 06:43:04
com.android.version : 9

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L3.1
Format settings : 1 Ref Frames
Format settings, CABAC : No
Format settings, Reference frames : 1 frame
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 6 s 313 ms
Bit rate : 3 945 kb/s
Width : 496 pixels
Height : 960 pixels
Display aspect ratio : 0.517
Frame rate mode : Variable
Frame rate : 29.306 FPS
Minimum frame rate : 19.767 FPS
Maximum frame rate : 39.508 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.283
Stream size : 2.97 MiB (100%)
Title : VideoHandle
Language : English
Encoded date : UTC 2019-07-11 06:43:04
Tagged date : UTC 2019-07-11 06:43:04
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC


Or as a diff image :


The problem is that I am not that familiar with ffmpeg yet I don't know all the quirks it has.


I hope someone can point me in the right direction.


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