I'm trying to add custom chapters with ffmpeg to an mp4 file by extracting the metadata file and following this guide.
However, when I edit the metadata file to change any of the chapter names, the second command to re-add the metadata ignores changes to the chapters and leaves them as they are. It definitely reads in the metadata file correctly, as when ffmpeg prints out the data of the two input files, it prints the streams of the mp4 and all the metadata of the metadata file, with all the chapters correctly formatted and parsed.
As soon as it creates the output file though, it has the old chapter names again. If I change other metadata that works (such as the title key or artist keys), but the chapters don't.
Full log of the start of the command:
PS D:\ffmpeg> ./bin/ffmpeg.exe -i .\new_file.mp4 -i FFMETADATAFILE -map_metadata 1 -codec copy .\output.mp4
ffmpeg version N-90979-g08032331ac Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 7.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --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
libavutil 56. 18.100 / 56. 18.100
libavcodec 58. 19.100 / 58. 19.100
libavformat 58. 13.101 / 58. 13.101
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 21.100 / 7. 21.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\new_file.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : new_file
encoder : Lavf57.46.100
Duration: 02:01:34.85, start: 0.000000, bitrate: 2940 kb/s
Chapter #0:0: start 0.000000, end 628.962000
Metadata:
title : Chapter 1
Chapter #0:1: start 628.962000, end 1042.083000
Metadata:
title : Chapter 2
Chapter #0:2: start 1042.083000, end 1882.172000
Metadata:
title : Chapter 3
Chapter #0:3: start 1882.172000, end 2479.102000
Metadata:
title : Chapter 4
Chapter #0:4: start 2479.102000, end 3095.718000
Metadata:
title : Chapter 5
Chapter #0:5: start 3095.718000, end 3681.511000
Metadata:
title : Chapter 6
Chapter #0:6: start 3681.511000, end 4145.600000
Metadata:
title : Chapter 7
Chapter #0:7: start 4145.600000, end 5149.019000
Metadata:
title : Chapter 8
Chapter #0:8: start 5149.019000, end 5704.908000
Metadata:
title : Chapter 9
Chapter #0:9: start 5704.908000, end 5980.850000
Metadata:
title : Chapter 10
Chapter #0:10: start 5980.850000, end 6826.403000
Metadata:
title : Chapter 11
Chapter #0:11: start 6826.403000, end 7294.746000
Metadata:
title : Chapter 12
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x816 [SAR 1:1 DAR 40:17], 2678 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream #0:2(eng): Data: bin_data (text / 0x74786574)
Metadata:
handler_name : SubtitleHandler
Input #1, ffmetadata, from 'FFMETADATAFILE':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : Title
encoder : Lavf58.13.101
Duration: 02:01:34.75, start: 0.000000, bitrate: 0 kb/s
Chapter #1:0: start 0.000000, end 628.962000
Metadata:
title : Edited Name
Chapter #1:1: start 628.962000, end 1042.083000
Metadata:
title : Chapter 2
Chapter #1:2: start 1042.083000, end 1882.172000
Metadata:
title : Chapter 3
Chapter #1:3: start 1882.172000, end 2479.102000
Metadata:
title : Chapter 4
Chapter #1:4: start 2479.102000, end 3095.718000
Metadata:
title : Chapter 5
Chapter #1:5: start 3095.718000, end 3681.511000
Metadata:
title : Chapter 6
Chapter #1:6: start 3681.511000, end 4145.600000
Metadata:
title : Chapter 7
Chapter #1:7: start 4145.600000, end 5149.019000
Metadata:
title : Chapter 8
Chapter #1:8: start 5149.019000, end 5704.908000
Metadata:
title : Chapter 9
Chapter #1:9: start 5704.908000, end 5980.850000
Metadata:
title : Chapter 10
Chapter #1:10: start 5980.850000, end 6826.403000
Metadata:
title : Chapter 11
Chapter #1:11: start 6826.403000, end 7294.746000
Metadata:
title : Chapter 12
File '.\output.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to '.\output.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
title : Title
encoder : Lavf58.13.101
Chapter #0:0: start 0.000000, end 628.962000
Metadata:
title : Chapter 1
Chapter #0:1: start 628.962000, end 1042.083000
Metadata:
title : Chapter 2
Chapter #0:2: start 1042.083000, end 1882.172000
Metadata:
title : Chapter 3
Chapter #0:3: start 1882.172000, end 2479.102000
Metadata:
title : Chapter 4
Chapter #0:4: start 2479.102000, end 3095.718000
Metadata:
title : Chapter 5
Chapter #0:5: start 3095.718000, end 3681.511000
Metadata:
title : Chapter 6
Chapter #0:6: start 3681.511000, end 4145.600000
Metadata:
title : Chapter 7
Chapter #0:7: start 4145.600000, end 5149.019000
Metadata:
title : Chapter 8
Chapter #0:8: start 5149.019000, end 5704.908000
Metadata:
title : Chapter 9
Chapter #0:9: start 5704.908000, end 5980.850000
Metadata:
title : Chapter 10
Chapter #0:10: start 5980.850000, end 6826.403000
Metadata:
title : Chapter 11
Chapter #0:11: start 6826.403000, end 7294.746000
Metadata:
title : Chapter 12
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x816 [SAR 1:1 DAR 40:17], q=2-31, 2678 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 90k tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
You can see I've edited the title key and the name of the first chapter in Input #1, the metadata file, but then only the title is different in the output.
Any help appreciated.
Answer
Solved - looks like -map_metadata only does the top keys before the chapters, you need -map_chapters to get the chapters as well.
ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -map_chapters 1 -codec copy OUTPUT
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