Video compress produces black screen, no video, but keeps audio

[danielgchap]

Description
Using ffmpeg I am able to upload a compressed video to firebase storage. However, the video is just a black screen but the audio is successfully there.

Here is my code:
static compressvideo(File video, BuildContext context) async { final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg(); Directory appDocumentDir = await getApplicationDocumentsDirectory(); String rawDocumentPath = appDocumentDir.path; await _flutterFFmpeg .execute('-i "${video.path}" -y -c:v mpeg4 $rawDocumentPath/output.mp4') .then((rc) => print("FFmpeg process exited with rc $rc")); File videoFile = new File("$rawDocumentPath/output.mp4"); return videoFile; }

Expected behavior
Compressed video with integrity of visual/audio elements left intact.

Current behavior
Black screen for length of video, audio is audible.

Screenshots
Here is a screenshot from my firebase storage of the video.

Logs
Post logs here or paste them to Ghostbin and insert the link here.
I/mobile-ffmpeg(29950): ffmpeg version v4.4-dev-416 I/mobile-ffmpeg(29950): Copyright (c) 2000-2020 the FFmpeg developers I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn) I/mobile-ffmpeg(29950): configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --extra-libs='-L/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-iconv --disable-sdl2 --enable-zlib --enable-mediacodec I/mobile-ffmpeg(29950): libavutil 56. 55.100 / 56. 55.100 I/mobile-ffmpeg(29950): libavcodec 58. 96.100 / 58. 96.100 I/mobile-ffmpeg(29950): libavformat 58. 48.100 / 58. 48.100 I/mobile-ffmpeg(29950): libavdevice 58. 11.101 / 58. 11.101 I/mobile-ffmpeg(29950): libavfilter 7. 87.100 / 7. 87.100 I/mobile-ffmpeg(29950): libswscale 5. 8.100 / 5. 8.100 I/mobile-ffmpeg(29950): libswresample 3. 8.100 / 3. 8.100 I/mobile-ffmpeg(29950): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/xxxxxxxxxxxxx/files/video_compress/VID_2021-05-24 11-16-36.mp4': I/mobile-ffmpeg(29950): Metadata: I/mobile-ffmpeg(29950): major_brand : I/mobile-ffmpeg(29950): mp42 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): minor_version : I/mobile-ffmpeg(29950): 0 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): compatible_brands: I/mobile-ffmpeg(29950): isommp42 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): creation_time : I/mobile-ffmpeg(29950): 2021-05-24T15:16:41.000000Z I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): location : I/mobile-ffmpeg(29950): +27.8752-082.6433/ I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): location-eng : I/mobile-ffmpeg(29950): +27.8752-082.6433/ I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): com.android.version: I/mobile-ffmpeg(29950): 10 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Duration: I/mobile-ffmpeg(29950): 00:00:12.12 I/mobile-ffmpeg(29950): , start: I/mobile-ffmpeg(29950): 0.000000 I/mobile-ffmpeg(29950): , bitrate: I/mobile-ffmpeg(29950): 3164 kb/s I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Stream #0:0 I/mobile-ffmpeg(29950): (eng) I/mobile-ffmpeg(29950): : Video: h264 (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/smpte170m), 640x1136, 3063 kb/s I/mobile-ffmpeg(29950): , SAR 1:1 DAR 40:71 I/mobile-ffmpeg(29950): , I/mobile-ffmpeg(29950): 30.03 fps, I/mobile-ffmpeg(29950): 30 tbr, I/mobile-ffmpeg(29950): 90k tbn, I/mobile-ffmpeg(29950): 180k tbc I/mobile-ffmpeg(29950): (default) I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Metadata: I/mobile-ffmpeg(29950): creation_time : I/mobile-ffmpeg(29950): 2021-05-24T15:16:41.000000Z I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): handler_name : I/mobile-ffmpeg(29950): VideoHandle I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Stream #0:1 I/mobile-ffmpeg(29950): (eng) I/mobile-ffmpeg(29950): : Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 95 kb/s I/mobile-ffmpeg(29950): (default) I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Metadata: I/mobile-ffmpeg(29950): creation_time : I/mobile-ffmpeg(29950): 2021-05-24T15:16:41.000000Z I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): handler_name : I/mobile-ffmpeg(29950): SoundHandle I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Stream mapping: I/mobile-ffmpeg(29950): Stream #0:0 -> #0:0 I/mobile-ffmpeg(29950): (h264 (native) -> mpeg4 (native)) I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Stream #0:1 -> #0:1 I/mobile-ffmpeg(29950): (aac (native) -> aac (native)) I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Press [q] to stop, [?] for help W/mobile-ffmpeg(29950): [graph 0 input from stream 0:0 @ 0x7105c3d040] sws_param option is deprecated and ignored I/mobile-ffmpeg(29950): Output #0, mp4, to '/data/user/0/xxxxxxxxxxxx/app_flutter/output.mp4': I/mobile-ffmpeg(29950): Metadata: I/mobile-ffmpeg(29950): major_brand : I/mobile-ffmpeg(29950): mp42 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): minor_version : I/mobile-ffmpeg(29950): 0 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): compatible_brands: I/mobile-ffmpeg(29950): isommp42 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): com.android.version: I/mobile-ffmpeg(29950): 10 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): location : I/mobile-ffmpeg(29950): +27.8752-082.6433/ I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): location-eng : I/mobile-ffmpeg(29950): +27.8752-082.6433/ I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): encoder : I/mobile-ffmpeg(29950): Lavf58.48.100 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Stream #0:0 I/mobile-ffmpeg(29950): (eng) I/mobile-ffmpeg(29950): : Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 640x1136 [SAR 1:1 DAR 40:71], q=2-31, 200 kb/s I/mobile-ffmpeg(29950): , I/mobile-ffmpeg(29950): 30 fps, I/mobile-ffmpeg(29950): 15360 tbn, I/mobile-ffmpeg(29950): 30 tbc I/mobile-ffmpeg(29950): (default) I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Metadata: I/mobile-ffmpeg(29950): creation_time : I/mobile-ffmpeg(29950): 2021-05-24T15:16:41.000000Z I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): handler_name : I/mobile-ffmpeg(29950): VideoHandle I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): encoder : I/mobile-ffmpeg(29950): Lavc58.96.100 mpeg4 I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Side data: I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): cpb: I/mobile-ffmpeg(29950): bitrate max/min/avg: 0/0/200000 buffer size: 0 I/mobile-ffmpeg(29950): vbv_delay: N/A I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Stream #0:1 I/mobile-ffmpeg(29950): (eng) I/mobile-ffmpeg(29950): : Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 69 kb/s I/mobile-ffmpeg(29950): (default) I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): Metadata: I/mobile-ffmpeg(29950): creation_time : I/mobile-ffmpeg(29950): 2021-05-24T15:16:41.000000Z I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): handler_name : I/mobile-ffmpeg(29950): SoundHandle I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): encoder : I/mobile-ffmpeg(29950): Lavc58.96.100 aac I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): frame= 38 fps=0.0 q=31.0 size= 256kB time=00:00:02.04 bitrate=1026.0kbits/s speed=4.06x I/mobile-ffmpeg(29950): frame= 87 fps= 86 q=31.0 size= 256kB time=00:00:03.06 bitrate= 683.6kbits/s speed=3.04x I/mobile-ffmpeg(29950): frame= 131 fps= 87 q=31.0 size= 256kB time=00:00:05.05 bitrate= 415.2kbits/s speed=3.35x I/mobile-ffmpeg(29950): frame= 183 fps= 91 q=31.0 size= 512kB time=00:00:07.05 bitrate= 594.3kbits/s speed= 3.5x I/mobile-ffmpeg(29950): frame= 234 fps= 93 q=31.0 size= 512kB time=00:00:08.06 bitrate= 520.4kbits/s speed= 3.2x I/mobile-ffmpeg(29950): frame= 283 fps= 93 q=31.0 size= 768kB time=00:00:10.06 bitrate= 625.1kbits/s speed=3.32x I/mobile-ffmpeg(29950): frame= 335 fps= 95 q=31.0 size= 768kB time=00:00:11.13 bitrate= 565.1kbits/s speed=3.15x I/mobile-ffmpeg(29950): frame= 364 fps= 96 q=31.0 Lsize= 1051kB time=00:00:12.10 bitrate= 711.2kbits/s speed=3.18x I/mobile-ffmpeg(29950): video:934kB audio:105kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: I/mobile-ffmpeg(29950): 1.127637% I/mobile-ffmpeg(29950): I/mobile-ffmpeg(29950): [aac @ 0x708591db00] Qavg: 416.785 D/flutter-ffmpeg(29950): FFmpeg exited with rc: 0 I/flutter (29950): FFmpeg process exited with rc 0

Environment
`[✓] Flutter (Channel stable, 2.2.0, on Mac OS X 10.15.7 19H524 darwin-x64, locale
en-US)
• Flutter version 2.2.0 at /Users/danielchapman/Dev/flutter
• Framework revision b22742018b (10 days ago), 2021-05-14 19:12:57 -0700
• Engine revision a9d88a4d18
• Dart version 2.13.0

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
• Android SDK at /Users/danielchapman/Library/Android/sdk
• Platform android-30, build-tools 30.0.2
• Java binary at: /Applications/Android
Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build
1.8.0_242-release-1644-b3-6915495)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.2, Build version 12B45b
• CocoaPods version 1.10.0

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build
1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.56.2)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.22.0

[✓] Connected device (2 available)
• Pixel 2 (mobile) • FA7AK1A00856 • android-arm64 • Android 10 (API 29)
• Chrome (web) • chrome • web-javascript • Google Chrome 90.0.4430.212

• No issues found!`

Other

Thank you so much for your help!

[danielgchap]

I'm sure this is from my own ignorance but if anyone has any thoughts, I'd appreciate it!

[jonasN5]

flutter/plugins#1307

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.