[Chzrz89]

Summary

FFmpeg 7 removed the codec capability lists (pix_fmts, supported_samplerates, sample_fmts, ch_layouts, and pre-5.1 channel_layouts) from the public AVCodec struct, so FFmpegWriter.cpp no longer compiles against current FFmpeg releases (8.x/9.x as shipped by MSYS2, Fedora 41+, Arch, etc.).

This adds four small inline helpers to FFmpegUtilities.h:

ffmpeg_codec_pix_fmts(codec)      // AV_CODEC_CONFIG_PIX_FORMAT
ffmpeg_codec_sample_rates(codec)  // AV_CODEC_CONFIG_SAMPLE_RATE
ffmpeg_codec_sample_fmts(codec)   // AV_CODEC_CONFIG_SAMPLE_FORMAT
ffmpeg_codec_ch_layouts(codec)    // AV_CODEC_CONFIG_CHANNEL_LAYOUT

• For LIBAVCODEC_VERSION_MAJOR >= 61: backed by avcodec_get_supported_config() (the API introduced alongside the struct-field removal)
• For older FFmpeg: return the existing struct fields directly, so behavior is byte-for-byte identical on FFmpeg <= 6 (including current CI on Ubuntu 22.04/24.04)

All call sites in FFmpegWriter.cpp now go through these helpers.

Incidental fix: while porting, a latent bug in the HAVE_CH_LAYOUT path became visible - the layout loop tested if (av_channel_layout_compare(&ch_layout, &codec_layouts[i])), treating non-matching layouts as valid instead of matching ones. Corrected to compare == 0. On old FFmpeg this bug was masked because both branches copied the same requested layout; on FFmpeg 7 it would have accepted the first non-matching entry.

Also: add missing #include "Exceptions.h" to tests/BeatSync.cpp, which uses openshot::InvalidJSON but previously only got it transitively.

Testing

Windows 11 / MSYS2, MinGW-w64 GCC 16.2.0, FFmpeg 9.0.1 (libavcodec 63.1.101):

• Full build: library, all unit tests, SWIG Python bindings, openshot-player example - PASS
• Functional round-trip via the Python bindings: read H.264/AAC MP4 -> Timeline with Blur effect -> export via FFmpegWriter (libx264 + AAC, sample format auto-negotiated to fltp through the new config path) -> output verified with ffprobe - PASS
• The legacy path is untouched for LIBAVCODEC < 61, so existing CI (FFmpeg 4.x/6.x) is unaffected

[jonoomph]

Thanks for the focused helpers and channel-layout comparison fix! Could you guard the entire AVChannelLayout helper for older FFmpeg versions and use the full libavcodec 61.13.100 boundary for avcodec_get_supported_config? The current declaration fails on FFmpeg 4.4, and the major-version check selects an unavailable API on FFmpeg 7.0. Please also preserve the legacy channel-layout validation and include older-version build checks alongside the modern build.

[jonoomph]

Thanks for the focused compatibility helpers and channel-layout fix! We’ve integrated this into arm64-support, where we’ll validate it with the other ARM groundwork before merging anything into develop.

• Corrected the API boundary to libavcodec 61.13.100, guarded the entire newer channel-layout declaration, and restored legacy layout validation.
• Added context-aware queries (also explored in Split newer-toolchain compatibility fixes from Arm64 readiness #1096), explicit query-error handling, and regression tests.
• The older full suite and focused FFmpeg 7.0/8.0 export tests pass locally; a new GitHub matrix also checks 7.0, 7.1, and 8.0.

Integration PR: #1117. The broader changes in #1096 remain separate.