The Matroska muxer does not yet support muxing cook

[deTian0]

Describe the bug
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The Matroska muxer does not yet support muxing cook
Matroska muxer 尚不支持 muxing cook

To Reproduce
Steps to reproduce the behavior:

使用音频编码为 cook 的 视频
Use audio encoded as cook for the video

Expected behavior
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Actual behavior
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Screenshots
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Environment:

• OS: Windows 11
• GPU: NVIDIA GeForce RTX 4060ti
• Video2X Version: 6.3.1

Full command
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Additional context
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[2025-01-15 20:52:28] [info] Starting Video2X Qt6 6.3.1
[2025-01-15 20:53:58] [error] [FFmpeg] [rm @ 000001e05e658f80] Invalid stream index 2 for index at pos 134338399
[2025-01-15 20:53:58] [info] [FFmpeg] [libx264 @ 000001e05e69c140] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[2025-01-15 20:53:58] [info] [FFmpeg] [libx264 @ 000001e05e69c140] profile High, level 5.0, 4:2:0, 8-bit
[2025-01-15 20:53:58] [info] [FFmpeg] [libx264 @ 000001e05e69c140] 264 - core 164 r3192 c24e06c - H.264/MPEG-4 AVC codec - Copyleft 2003-2024 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 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=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[2025-01-15 20:53:58] [error] [FFmpeg] [matroska @ 000001e066c85c00] The Matroska muxer does not yet support muxing cook
[2025-01-15 20:53:58] [error] Error writing output file header
[2025-01-15 20:53:58] [critical] Failed to initialize encoder: Not yet implemented in FFmpeg, patches welcome

[k4yt3x]

That's the expected behavior right now, since the program only copies the audio streams without any re-encoding:

video2x/src/libvideo2x.cpp

Lines 262 to 267 in 031c0a7

	} else if (enc_cfg_.copy_streams && stream_map[packet->stream_index] >= 0) {
	ret = write_raw_packet(packet.get(), ifmt_ctx, ofmt_ctx, stream_map);
	if (ret < 0) {
	return ret;
	}
	}

video2x/src/libvideo2x.cpp

Lines 320 to 342 in 031c0a7

	int VideoProcessor::write_raw_packet(
	AVPacket* packet,
	AVFormatContext* ifmt_ctx,
	AVFormatContext* ofmt_ctx,
	int* stream_map
	) {
	char errbuf[AV_ERROR_MAX_STRING_SIZE];
	int ret = 0;
	AVStream* in_stream = ifmt_ctx->streams[packet->stream_index];
	int out_stream_idx = stream_map[packet->stream_index];
	AVStream* out_stream = ofmt_ctx->streams[out_stream_idx];
	av_packet_rescale_ts(packet, in_stream->time_base, out_stream->time_base);
	packet->stream_index = out_stream_idx;
	ret = av_interleaved_write_frame(ofmt_ctx, packet);
	if (ret < 0) {
	av_strerror(ret, errbuf, sizeof(errbuf));
	logger()->critical("Error muxing audio/subtitle packet: {}", errbuf);
	}
	return ret;
	}

In order to support ANY codec, we'll need to also implement an encoder for the audio streams. It can be done but will require extra work. You can try changing to a container that supports the cook codec or let v2x to not copy the audio stream for now: