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• How to apply 'simple 'opacity to combined(layered) mp4s in FFMPEG

  27 mai 2021, par Cam

  I am not getting the final image results I need when layering together multiple mp4s of the same length and format into a single output MP4. I am using ffmpeg to create a pseudo 'motion blur' effect on animation, and need to layer mp4s together with identical opacities to produce the final video.

  


  I am using a base 'black' MP4 as the first layer for a background, and then adding a series of source mp4s with equal opacity over the top in each pass. Here I am showing a photoshop mockup using their 'normal' blending mode which is exactly the blending effect I am trying to replicate with ffmpeg. I understand that the final composite is less "bright" but that's fine (unless you have any ideas).


  


  Instead of looking like the result above, I am getting output where the colors are either all pink, garbled, super dark or generally hugely overbright etc based on trying different blend modes.

  


  Here are the commands I am using :

  


  To create the original (uncompressed ?) 'black' MP4 from a sequence of black pngs :

  


  ffmpeg -start_number 0 -r 24 -f image2 -s 1920x1080 -i black_seq.%04d.png -vcodec libx264 -crf 0 -pix_fmt yuv420p   black_seq.mp4 -y


  


  I then take that "black_seq.mp4" and blend a set of n number of source mp4s over the top with an opacity value. This runs in a loop and the output.mp4 of each pass becomes the input.mp4 of the next pass until it completes. In this example a total of 10 source mp4s assigns their opacity to 0.1 for each pass, and this is a single pass (below). The source mp4s are all very similar in their appearance and color, essentially just the same sequence of animation but offset in time by fractions of a single frame and have been generated from color pngs, using the same code that produced the first black layer (above).

  


  ffmpeg i input.mp4 -i n_layer.mp4 -vcodec libx264 -crf 0 -pix_fmt yuv420p   -filter_complex "blend=all_mode='overlay':all_opacity=0.1" output.mp4 -y


  


  Then finally add some compression to the result as the final "blur.mp4"

  


  ffmpeg -i "output.mp4" -vcodec libx264 -crf 25 -pix_fmt yuv420p "blur.mp4" -y


  


  And yes, this is certainly highly inefficient as an approach, but I am learning. The main issue I am trying to solve is, despite the final blur.mp4 being less "bright", it has colors that are not matching the original animation and instead looks like the animation has been hue shifted somehow.

  


  This image shows a cropped output for comparison (the processed blur is set to zero for clarity)


  


  I would love some insight.

  


• Error in writing video file using moviepy and ffmpeg

  13 juillet, par Divakar Sharma

  I have been working with moviepy library for the first time. I have a video clip around 7 hours long, and I'd like to clip it into small clips. I have a list of start and end time.

  


  video = VideoFileClip("videoFile.mp4")
clips = []
for cut in cuts:
   clip = video.subclip(cut[0], cut[1])
   clips.append(clip)
clips
clip = video.subclip("7:32:18", "7:38:38")
clips.append(clip)
for clip, title in zip(clips, title_list):
 clip.write_videofile(title + '.mp4', threads=8, fps=24, audio=True, codec='libx264',preset=compression)
video.close()


  


  clips[] contain the start and end time for clipping. I have a list of title too which I have scraped from youtube. I have not included the two lists here but a small example could be :

  


  cuts = [('0:00', '2:26'),
 ('2:26', '5:00'),
 ('5:00', '7:15'),
 ('7:15', '10:57'),
 ('10:57', '18:00'),
 ('18:00', '18:22'),
 ('18:22', '19:57'),
 ('19:57', '20:37'),
 ('20:37', '28:27'),
 ('28:27', '40:32'),
 ('40:32', '49:57'),...
title_list = ['Introduction (What is Todoist?), tech stack talk', 'Showing the final application (with dark mode!)', 'Installing create react app', "Clearing out what we don't need from create react app", "Let's get building our components!", 'Installing packages using Yarn', 'Building the Header component', 'Building the Content component',...


  


  OSError: [Errno 32] Broken pipe

MoviePy error: FFMPEG encountered the following error while writing file Introduction(WhatisTodoist?),techstacktalkTEMP_MPY_wvf_snd.mp3:

b'Introduction(WhatisTodoist?),techstacktalkTEMP_MPY_wvf_snd.mp3: Invalid argument\r\n'

In case it helps, make sure you are using a recent version of FFMPEG (the versions in the Ubuntu/Debian repos are deprecated).


  


  Above is the error I am getting after running the write_videofile(). I have looked at the documentation and the issues on github, I tried updating the ffmpeg through pip too. I don't know why it can't write the audio file.

  


• FFMPEG Artwork cover image not set [duplicate]

  16 août 2021, par DP_Dev

  Bellow is my FFMPEG command where is converting video file to audio and also setting artwork, but artwork not setting in audio file. FFMPEG command not giving any error.

  


  [-y, -i, input.mp4, -i, artwork.jpg, -ss, 00:00:00.00, -to, 00:00:15.00, -map, 0:1, -map, 1, -vn, -acodec, copy, -metadata, comment=Cover (Front), -id3v2_version, 3, -write_id3v1, 1, output.m4a]

  


  I am extracting audio file from video file and adding art cover to audio output file. Output generated in FFmpeg process. Cover of output file is not set and no error in output. :

  


  I/ffmpeg-kit: ffmpeg version v4.4-dev-3015-gc0d0b1c4f6
I/ffmpeg-kit:  Copyright (c) 2000-2021 the FFmpeg developers
I/ffmpeg-kit:   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/22.0.7026061/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/storage/dark/projects/ffmpeg-kit/prebuilt/android-arm64-lts/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --cc=aarch64-linux-android21-clang --cxx=aarch64-linux-android21-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/storage/dark/projects/ffmpeg-kit/prebuilt/android-arm64-lts/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 --disable-static --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-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 --disable-sdl2 --enable-libmp3lame --enable-iconv --enable-libvorbis --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libilbc --enable-libopus --enable-libsoxr --enable-libtwolame --enable-libvo-amrwbenc --enable-zlib --enable-mediacodec
V/FA: Activity resumed, time: 113363059
I/ffmpeg-kit:   libavutil      56. 65.100 / 56. 65.100
I/ffmpeg-kit:   libavcodec     58.123.100 / 58.123.100
I/ffmpeg-kit:   libavformat    58. 67.100 / 58. 67.100
I/ffmpeg-kit:   libavdevice    58. 12.100 / 58. 12.100
I/ffmpeg-kit:   libavfilter     7.106.100 /  7.106.100
I/ffmpeg-kit:   libswscale      5.  8.100 /  5.  8.100
I/ffmpeg-kit:   libswresample   3.  8.100 /  3.  8.100

I/ffmpeg-kit: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4'
I/ffmpeg-kit:   Metadata:
I/ffmpeg-kit:     major_brand     : 
I/ffmpeg-kit: mp42
I/ffmpeg-kit:     minor_version   : 
I/ffmpeg-kit: 0
I/ffmpeg-kit:     compatible_brands: 
I/ffmpeg-kit: isommp42
I/ffmpeg-kit:     creation_time   : 
I/ffmpeg-kit: 2021-05-30T10:25:09.000000Z
I/ffmpeg-kit:     com.android.version: 
I/ffmpeg-kit: 10
I/ffmpeg-kit:   Duration: 
I/ffmpeg-kit: 00:00:51.40
I/ffmpeg-kit: , start: 
I/ffmpeg-kit: 0.000000
I/ffmpeg-kit: , bitrate: 
I/ffmpeg-kit: 20306 kb/s
I/ffmpeg-kit:   Stream #0:0
I/ffmpeg-kit: (eng)
I/ffmpeg-kit: : Video: h264 (avc1 / 0x31637661), yuvj420p(pc, bt470bg/bt470bg/smpte170m), 1920x1080, 20084 kb/s
I/ffmpeg-kit: , SAR 1:1 DAR 16:9
I/ffmpeg-kit: , 
I/ffmpeg-kit: 30 fps, 
I/ffmpeg-kit: 30 tbr, 
I/ffmpeg-kit: 90k tbn, 
I/ffmpeg-kit: 180k tbc
I/ffmpeg-kit:  (default)
I/ffmpeg-kit:     Metadata:
I/ffmpeg-kit:       rotate          : 
I/ffmpeg-kit: 90
I/ffmpeg-kit:       creation_time   : 
I/ffmpeg-kit: 2021-05-30T10:25:09.000000Z
I/ffmpeg-kit:       handler_name    : 
I/ffmpeg-kit: VideoHandle
I/ffmpeg-kit:       vendor_id       : 
I/ffmpeg-kit: [0][0][0][0]
I/ffmpeg-kit:     Side data:
I/ffmpeg-kit:       
I/ffmpeg-kit: displaymatrix: rotation of -90.00 degrees
I/ffmpeg-kit:   Stream #0:1
I/ffmpeg-kit: (eng)
I/ffmpeg-kit: : Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s
I/ffmpeg-kit:  (default)
I/ffmpeg-kit:     Metadata:
I/ffmpeg-kit:       creation_time   : 
I/ffmpeg-kit: 2021-05-30T10:25:09.000000Z
I/ffmpeg-kit:       handler_name    : 
I/ffmpeg-kit: SoundHandle
I/ffmpeg-kit:       vendor_id       : 
I/ffmpeg-kit: [0][0][0][0]
W/turn.videotomp: Accessing hidden method Lsun/misc/Unsafe;->compareAndSwapObje
I/ffmpeg-kit: Input #1, image2, from 'cover.jpg'
I/ffmpeg-kit:   Duration: 
I/ffmpeg-kit: 00:00:00.04
I/ffmpeg-kit: , start: 
I/ffmpeg-kit: 0.000000
I/ffmpeg-kit: , bitrate: 
I/ffmpeg-kit: 245926 kb/s
I/ffmpeg-kit:   Stream #1:0
I/ffmpeg-kit: : Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 2420x3226 
I/ffmpeg-kit: , 
I/ffmpeg-kit: 25 fps, 
I/ffmpeg-kit: 25 tbr, 
I/ffmpeg-kit: 25 tbn, 
I/ffmpeg-kit: 25 tbc
I/ffmpeg-kit: Output #0, ipod, to 'output.m4a'
I/ffmpeg-kit:   Metadata:
I/ffmpeg-kit:     major_brand     : 
I/ffmpeg-kit: mp42
I/ffmpeg-kit:     minor_version   : 
I/ffmpeg-kit: 0
I/ffmpeg-kit:     compatible_brands: 
I/ffmpeg-kit: isommp42
I/ffmpeg-kit:     com.android.version: 
I/ffmpeg-kit: 10
I/ffmpeg-kit:     encoder         : 
I/ffmpeg-kit: Lavf58.67.100
I/ffmpeg-kit:   Stream #0:0
I/ffmpeg-kit: (eng)
I/ffmpeg-kit: : Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s
I/ffmpeg-kit:  (default)
I/ffmpeg-kit:     Metadata:
I/ffmpeg-kit:       creation_time   : 
I/ffmpeg-kit: 2021-05-30T10:25:09.000000Z
I/ffmpeg-kit:       handler_name    : 
I/ffmpeg-kit: SoundHandle
I/ffmpeg-kit:       vendor_id       : 
I/ffmpeg-kit: [0][0][0][0]
I/ffmpeg-kit: Stream mapping:
I/ffmpeg-kit:   Stream #0:1 -> #0:0
I/ffmpeg-kit:  (copy)
I/ffmpeg-kit: Press [q] to stop, [?] for help
I/ffmpeg-kit: size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x