ffmpeg seems to output a video with a wrong codec? - flutter

Question

I´m using ffmpeg with flutter and I create a video from a lot of images. The problem: ffmpeg seems to not create a video with a right codec or something else.... please check my description below for concrete informations.
First the code parts:
Creating video from images
-r $settings_fps -i $tempPath/img%04d.jpg -vcodec libx264 -y -an -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -shortest $tempPath/$videoFileName.mp4
Adding audio to the created video
-i ${finalSong.path} -i $videoPath -c:a aac -shortest $tempPath/$newVideoFileName.mp4
This is my video output from console on creating this video:
flutter: ffmpeg version git-2020-01-25-fd11dd500 Copyright (c) 2000-2020 the FFmpeg developers
built with Apple clang version 11.0.0 (clang-1100.0.33.17)
configuration: --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk --prefix=/Users/taner/Projects/mobile-ffmpeg/prebuilt/ios-arm64-apple-darwin/ffmpeg --enable-version3 --arch=aarch64 --cpu=armv8 --target-os=darwin --ar=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --cc=clang --cxx=clang++ --as='/Users/taner/Projects/mobile-ffmpeg/.tmp/gas-preprocessor.pl -arch aarch64 -- clang -arch arm64 -target aarch64-ios-darwin -march=armv8-a+crc+crypto -mcpu=generic -DMOBILE_FFMPEG_ARM64 -Wno-unused-function -Wno-deprecated-declarations -fstrict-aliasing -fembed-bitcode -DIOS -DMOBILE_FFMPEG_BUILD_DATE=20200125 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk -Oz -miphoneos-version-min=12.1 -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include' --ranlib=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib --strip=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip --enable-neon --enable-cross-compile --enable-pic --enable-asm --enable-inline-asm --enable-optimizations --enable-swscale --enable-static --disable-shared --enable-small --disable-v4l2-m2m --disable-outdev=v4l2 --disable-outdev=fbdev --disable-indev=v4l2 --disable-indev=fbdev --disable-openssl --disable-xmm-clobber-test --disable-debug --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --disable-sdl2 --enable-zlib --enable-audiotoolbox --enable-coreimage --enable-bzlib --enable-videotoolbox --enable-avfoundation --enable-iconv
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 65.102 / 58. 65.102
libavformat 58. 35.101 / 58. 35.101
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 70.101 / 7. 70.101
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
Input #0, mp3, from '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/melodic_slow.mp3':
Metadata:
encoder : LAME 32bits version 3.99.5 (http://lame.sf.net)
TLEN : 134072
Duration: 00:02:14.11, start: 0.025057, bitrate: 320 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
Metadata:
encoder : LAME3.99r
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/Memories_163dfbf0-f4cf-11ea-86c6-cd08c5621e56.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.35.101
Duration: 00:00:03.50, start: 0.000000, bitrate: 10069 kb/s
Stream #1:0(und): Video: h264 (avc1 / 0x31637661), yuvj422p(pc), 1920x1080 [SAR 1:1 DAR 16:9], 10065 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
Metadata:
handler_name : VideoHandler
Stream mapping:
Stream #1:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=0.0 size= 0kB time=-577014:32:22.77 bitrate= -0.0kbits/s speed=N/A
sws_param option is deprecated and ignored
using SAR=1/1
using cpu capabilities: ARMv8 NEON
profile High 4:2:2, level 4.0, 4:2:2, 8-bit
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_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=9 lookahead_threads=1 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=24 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 '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/Memories_191007b0-f4cf-11ea-9024-c9fcef51db39.mp4':
Metadata:
TLEN : 134072
encoder : Lavf58.35.101
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuvj422p(pc, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.65.102 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavc58.65.102 aac
frame= 47 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
frame= 61 fps= 49 q=28.0 size= 256kB time=00:00:00.23 bitrate=9033.3kbits/s speed=0.187x
frame= 73 fps= 42 q=28.0 size= 512kB time=00:00:00.71 bitrate=5827.4kbits/s speed=0.411x
frame= 84 fps= 21 q=-1.0 Lsize= 3418kB time=00:00:03.50 bitrate=7986.4kbits/s speed=0.856x
video:3359kB audio:55kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.117042%
frame I:1 Avg QP:22.78 size:170700
frame P:22 Avg QP:23.95 size: 83595
frame B:61 Avg QP:28.22 size: 23428
consecutive B-frames: 2.4% 2.4% 0.0% 95.2%
mb I I16..4: 1.8% 97.3% 0.9%
mb P I16..4: 0.4% 13.4% 1.0% P16..4: 39.0% 21.7% 14.2% 0.0% 0.0% skip:10.3%
mb B I16..4: 0.1% 2.4% 0.2% B16..8: 27.0% 6.3% 2.1% direct: 2.4% skip:59.5% L0:39.3% L1:47.8% BI:12.9%
8x8 transform intra:91.6% inter:83.1%
coded y,uvDC,uvAC intra: 88.4% 97.3% 40.9% inter: 21.1% 26.6% 1.7%
i16 v,h,dc,p: 18% 27% 7% 48%
i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 18% 16% 5% 8% 8% 9% 7% 9%
i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 16% 13% 7% 11% 10% 10% 7% 8%
i8c dc,h,v,p: 41% 19% 28% 12%
Weighted P-Frames: Y:0.0% UV:0.0%
ref P L0: 53.9% 22.4% 18.3% 5.4%
ref B L0: 86.7% 9.9% 3.4%
ref B L1: 96.1% 3.9%
kb/s:7860.37
Qavg: 149.884
flutter: ffmpeg version git-2020-01-25-fd11dd500
flutter: Copyright (c) 2000-2020 the FFmpeg developers
flutter:
flutter: built with Apple clang version 11.0.0 (clang-1100.0.33.17)
flutter: configuration: --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk --prefix=/Users/taner/Projects/mobile-ffmpeg/prebuilt/ios-arm64-apple-darwin/ffmpeg --enable-version3 --arch=aarch64 --cpu=armv8 --target-os=darwin --ar=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --cc=clang --cxx=clang++ --as='/Users/taner/Projects/mobile-ffmpeg/.tmp/gas-preprocessor.pl -arch aarch64 -- clang -arch arm64 -target aarch64-ios-darwin -march=armv8-a+crc+crypto -mcpu=generic -DMOBILE_FFMPEG_ARM64 -Wno-unused-function -Wno-deprecated-declarations -fstrict-aliasing -fembed-bitcode -DIOS -DMOBILE_FFMPEG_BUILD_DATE=20200125 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk -Oz -miphoneos-version-min=12.1 -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include' --ranlib=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib --strip=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip --enable-neon --enable-cross-compile --enable-pic --enable-asm --enable-inline-asm --enable-optimizations --enable-swscale --enable-static --disable-shared --enable-small --disable-v4l2-m2m --disable-outdev=v4l2 --disable-outdev=fbdev --disable-indev=v4l2 --disable-indev=fbdev --disable-openssl --disable-xmm-clobber-test --disable-debug --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --disable-sdl2 --enable-zlib --enable-audiotoolbox --enable-coreimage --enable-bzlib --enable-videotoolbox --enable-avfoundation --enable-iconv
flutter: libavutil 56. 38.100 / 56. 38.100
flutter: libavcodec 58. 65.102 / 58. 65.102
flutter: libavformat 58. 35.101 / 58. 35.101
flutter: libavdevice 58. 9.103 / 58. 9.103
flutter: libavfilter 7. 70.101 / 7. 70.101
flutter: libswscale 5. 6.100 / 5. 6.100
flutter: libswresample 3. 6.100 / 3. 6.100
flutter: Input #0, image2, from '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/img%04d.jpg':
flutter: Duration:
flutter: 00:00:03.40
flutter: , start:
flutter: 0.000000
flutter: , bitrate:
flutter: N/A
flutter:
flutter: Stream #0:0
flutter: : Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9]
flutter: ,
flutter: 25 fps,
flutter: 25 tbr,
flutter: 25 tbn,
flutter: 25 tbc
flutter:
flutter: Stream mapping:
flutter: Stream #0:0 -> #0:0
flutter: (mjpeg (native) -> h264 (libx264))
flutter:
flutter: Press [q] to stop, [?] for help
flutter: sws_param option is deprecated and ignored
flutter: using SAR=1/1
flutter: using cpu capabilities: ARMv8 NEON
flutter: profile High 4:2:2, level 4.0, 4:2:2, 8-bit
flutter: 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_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=9 lookahead_threads=1 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=24 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
flutter: Output #0, mp4, to '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/Memories_f578a1c0-f4d0-11ea-9e60-5b43394b2511.mp4':
flutter: Metadata:
flutter: encoder :
flutter: Lavf58.35.101
flutter:
flutter: Stream #0:0
flutter: : Video: h264 (libx264) (avc1 / 0x31637661), yuvj422p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1
flutter: ,
flutter: 24 fps,
flutter: 12288 tbn,
flutter: 24 tbc
flutter:
flutter: Metadata:
flutter: encoder :
flutter: Lavc58.65.102 libx264
flutter:
flutter: Side data:
flutter:
flutter: cpb:
flutter: bitrate max/min/avg: 0/0/0 buffer size: 0
flutter: vbv_delay: N/A
flutter:
flutter: frame= 1 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed=N/A
flutter: frame= 47 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
flutter: frame= 60 fps= 53 q=28.0 size= 256kB time=00:00:00.16 bitrate=12579.1kbits/s speed=0.147x
flutter: frame= 72 fps= 43 q=28.0 size= 768kB time=00:00:00.66 bitrate=9436.6kbits/s speed=0.401x
flutter: frame= 84 fps= 38 q=28.0 size= 1280kB time=00:00:01.16 bitrate=8987.5kbits/s speed=0.527x
flutter: frame= 85 fps= 19 q=-1.0 Lsize= 4334kB time=00:00:03.41 bitrate=10391.1kbits/s speed=0.773x
flutter: video:4332kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
flutter: 0.043800%
flutter:
flutter: frame I:1 Avg QP:22.19 size:178746
flutter: frame P:21 Avg QP:23.69 size:106999
flutter: frame B:63 Avg QP:28.13 size: 31899
flutter: consecutive B-frames: 1.2% 0.0% 0.0% 98.8%
flutter: mb I I16..4: 2.4% 97.0% 0.6%
flutter: mb P I16..4: 0.7% 38.2% 0.8% P16..4: 22.6% 19.2% 15.1% 0.0% 0.0% skip: 3.3%
flutter: mb B I16..4: 0.2% 6.7% 0.2% B16..8: 24.6% 8.6% 3.0% direct: 4.2% skip:52.5% L0:47.8% L1:36.8% BI:15.4%
flutter: 8x8 transform intra:95.8% inter:86.8%
flutter: coded y,uvDC,uvAC intra: 89.3% 95.1% 22.5% inter: 26.3% 28.9% 3.0%
flutter: i16 v,h,dc,p: 20% 33% 22% 24%
flutter: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 24% 33% 3% 4% 3% 4% 4% 5%
flutter: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 20% 16% 6% 10% 7% 9% 6% 7%
flutter: i8c dc,h,v,p: 44% 22% 29% 5%
flutter: Weighted P-Frames: Y:0.0% UV:0.0%
flutter: ref P L0: 43.8% 18.2% 23.0% 15.0%
flutter: ref B L0: 69.6% 22.3% 8.1%
flutter: ref B L1: 86.1% 13.9%
flutter: kb/s:10018.70
flutter: Video erfolgreich erstellt
flutter: Ja. Video existiert im Pfad!
flutter: ffmpeg version git-2020-01-25-fd11dd500
flutter: Copyright (c) 2000-2020 the FFmpeg developers
flutter:
flutter: built with Apple clang version 11.0.0 (clang-1100.0.33.17)
flutter: configuration: --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk --prefix=/Users/taner/Projects/mobile-ffmpeg/prebuilt/ios-arm64-apple-darwin/ffmpeg --enable-version3 --arch=aarch64 --cpu=armv8 --target-os=darwin --ar=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar --cc=clang --cxx=clang++ --as='/Users/taner/Projects/mobile-ffmpeg/.tmp/gas-preprocessor.pl -arch aarch64 -- clang -arch arm64 -target aarch64-ios-darwin -march=armv8-a+crc+crypto -mcpu=generic -DMOBILE_FFMPEG_ARM64 -Wno-unused-function -Wno-deprecated-declarations -fstrict-aliasing -fembed-bitcode -DIOS -DMOBILE_FFMPEG_BUILD_DATE=20200125 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk -Oz -miphoneos-version-min=12.1 -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include' --ranlib=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib --strip=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip --enable-neon --enable-cross-compile --enable-pic --enable-asm --enable-inline-asm --enable-optimizations --enable-swscale --enable-static --disable-shared --enable-small --disable-v4l2-m2m --disable-outdev=v4l2 --disable-outdev=fbdev --disable-indev=v4l2 --disable-indev=fbdev --disable-openssl --disable-xmm-clobber-test --disable-debug --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-libx264 --enable-gpl --enable-libxvid --enable-gpl --enable-libx265 --enable-gpl --enable-libvidstab --enable-gpl --disable-sdl2 --enable-zlib --enable-audiotoolbox --enable-coreimage --enable-bzlib --enable-videotoolbox --enable-avfoundation --enable-iconv
flutter: libavutil 56. 38.100 / 56. 38.100
flutter: libavcodec 58. 65.102 / 58. 65.102
flutter: libavformat 58. 35.101 / 58. 35.101
flutter: libavdevice 58. 9.103 / 58. 9.103
flutter: libavfilter 7. 70.101 / 7. 70.101
flutter: libswscale 5. 6.100 / 5. 6.100
flutter: libswresample 3. 6.100 / 3. 6.100
flutter: Input #0, mp3, from '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/melodic_slow.mp3':
flutter: Metadata:
flutter: encoder :
flutter: LAME 32bits version 3.99.5 (http://lame.sf.net)
flutter:
flutter: TLEN :
flutter: 134072
flutter:
flutter: Duration:
flutter: 00:02:14.11
flutter: , start:
flutter: 0.025057
flutter: , bitrate:
flutter: 320 kb/s
flutter:
flutter: Stream #0:0
flutter: : Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
flutter:
flutter: Metadata:
flutter: encoder :
flutter: LAME3.99r
flutter:
flutter: Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/Memories_f578a1c0-f4d0-11ea-9e60-5b43394b2511.mp4':
flutter: Metadata:
flutter: major_brand :
flutter: isom
flutter:
flutter: minor_version :
flutter: 512
flutter:
flutter: compatible_brands:
flutter: isomiso2avc1mp41
flutter:
flutter: encoder :
flutter: Lavf58.35.101
flutter:
flutter: Duration:
flutter: 00:00:03.54
flutter: , start:
flutter: 0.000000
flutter: , bitrate:
flutter: 10023 kb/s
flutter:
flutter: Stream #1:0
flutter: (und)
flutter: : Video: h264 (avc1 / 0x31637661), yuvj422p(pc), 1920x1080 [SAR 1:1 DAR 16:9], 10020 kb/s
flutter: ,
flutter: 24 fps,
flutter: 24 tbr,
flutter: 12288 tbn,
flutter: 48 tbc
flutter: (default)
flutter:
flutter: Metadata:
flutter: handler_name :
flutter: VideoHandler
flutter:
flutter: Stream mapping:
flutter: Stream #1:0 -> #0:0
flutter: (h264 (native) -> h264 (libx264))
flutter:
flutter: Stream #0:0 -> #0:1
flutter: (mp3 (mp3float) -> aac (native))
flutter:
flutter: Press [q] to stop, [?] for help
flutter: frame= 0 fps=0.0 q=0.0 size= 0kB time=-577014:32:22.77 bitrate= -0.0kbits/s speed=N/A
flutter: sws_param option is deprecated and ignored
flutter: using SAR=1/1
flutter: using cpu capabilities: ARMv8 NEON
flutter: profile High 4:2:2, level 4.0, 4:2:2, 8-bit
flutter: 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_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=9 lookahead_threads=1 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=24 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
flutter: Output #0, mp4, to '/var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/Memories_f81f09a0-f4d0-11ea-983d-0b683ab874e3.mp4':
flutter: Metadata:
flutter: TLEN :
flutter: 134072
flutter:
flutter: encoder :
flutter: Lavf58.35.101
flutter:
flutter: Stream #0:0
flutter: (und)
flutter: : Video: h264 (libx264) (avc1 / 0x31637661), yuvj422p(pc, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1
flutter: ,
flutter: 24 fps,
flutter: 12288 tbn,
flutter: 24 tbc
flutter: (default)
flutter:
flutter: Metadata:
flutter: handler_name :
flutter: VideoHandler
flutter:
flutter: encoder :
flutter: Lavc58.65.102 libx264
flutter:
flutter: Side data:
flutter:
flutter: cpb:
flutter: bitrate max/min/avg: 0/0/0 buffer size: 0
flutter: vbv_delay: N/A
flutter:
flutter: Stream #0:1
flutter: : Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
flutter:
flutter: Metadata:
flutter: encoder :
flutter: Lavc58.65.102 aac
flutter:
flutter: frame= 47 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
flutter: frame= 61 fps= 57 q=28.0 size= 256kB time=00:00:00.23 bitrate=9033.3kbits/s speed=0.218x
flutter: frame= 74 fps= 46 q=28.0 size= 768kB time=00:00:00.78 bitrate=7969.6kbits/s speed=0.489x
flutter: frame= 85 fps= 22 q=-1.0 Lsize= 3440kB time=00:00:03.55 bitrate=7933.2kbits/s speed=0.902x
flutter: video:3380kB audio:56kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
flutter: 0.117084%
flutter:
flutter: frame I:1 Avg QP:22.68 size:174045
flutter: frame P:22 Avg QP:23.88 size: 84065
flutter: frame B:62 Avg QP:28.21 size: 23184
flutter: consecutive B-frames: 1.2% 4.7% 0.0% 94.1%
flutter: mb I I16..4: 2.0% 97.3% 0.7%
flutter: mb P I16..4: 0.4% 13.4% 0.9% P16..4: 39.3% 21.6% 14.6% 0.0% 0.0% skip: 9.7%
flutter: mb B I16..4: 0.1% 2.4% 0.2% B16..8: 26.7% 6.3% 2.0% direct: 2.5% skip:59.8% L0:41.1% L1:45.7% BI:13.1%
flutter: 8x8 transform intra:91.8% inter:83.1%
flutter: coded y,uvDC,uvAC intra: 88.3% 97.2% 41.4% inter: 21.0% 26.5% 1.7%
flutter: i16 v,h,dc,p: 18% 25% 5% 52%
flutter: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 19% 16% 5% 8% 8% 9% 7% 9%
flutter: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 16% 13% 7% 12% 9% 10% 7% 8%
flutter: i8c dc,h,v,p: 41% 19% 28% 12%
flutter: Weighted P-Frames: Y:0.0% UV:0.0%
flutter: ref P L0: 53.4% 22.2% 18.9% 5.5%
flutter: ref B L0: 86.6% 10.3% 3.2%
flutter: ref B L1: 95.8% 4.2%
flutter: kb/s:7817.54
flutter: Qavg: 149.529
flutter: Speichern mit GallerySaver: /var/mobile/Containers/Data/Application/AEEF7BB8-36F3-4ECD-824B-B294E9DF7294/Library/Caches/Memories_f81f09a0-f4d0-11ea-983d-0b683ab874e3.mp4
flutter: Speichern mit GallerySaver nicht erfolgreich
In general the created video works, but: If i try to save it as video with flutter gallery_saver to the device, this video will not saved. Other videos for example works well. But not the created with ffmpeg.
Can you find any reason for this in the ffmpeg output log? Thank you!

Answer 1

Videos for web playback usually require chroma sampling to be 4:2:0. FFmpeg, by default, will try to preserve the source sampling scheme, so your output is 4:2:2 (see yuvj422p in the output stream).
Use for step 1,
-r $settings_fps -i $tempPath/img%04d.jpg -vcodec libx264 -y -an -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -pix_fmt yuv420p $tempPath/$videoFileName.mp4
And in step 2, avoid re-encoding video
-i ${finalSong.path} -i $videoPath -c:v copy -c:a aac -shortest $tempPath/$newVideoFileName.mp4