次のようなプロセスがあります:
入力ビデオが N 個あります。次のコードを使用して、それらをカットおよびトランスコードします。
ffmpeg.exe -c:v h264_cuvid -resize 1920x1080 -noaccurate_seek -ss 00:00:04.000 -to 00:00:44.240 -i "input_N.MP4" -v error -filter:v fps=fps=25 -c:v h264_nvenc -preset medium -profile high -b:v 8000k -bufsize 8000k -maxrate 10000k -qmin 0 -g 250 -bf 2 -i_qfactor 0.75 -b_qfactor 1.1 "output_N.mp4"
次の形式で videoArrayFile.txt を作成します。
ファイル 'myFilePath\output_N.mp4' ファイル 'myFilePath\output_N.mp4' ファイル 'myFilePath\output_N.mp4' ...
次のコマンドを使用して、videoArrayFile.txt 内のファイルを連結します。
ffmpeg.exe -f concat -v error -safe 0 -i "myPath\videoArrayFile.txt" -filter:a "volume=1" -c:v copy -c:a aac "myPath\outputConcat.mp4"
これは上記のコマンドを実行したときの ffmpeg ログです:
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (50) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (50) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (50) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (50) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (50) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (50) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (50) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
[aac @ 000001fa4273e000] Number of scalefactor bands in group (51) exceeds limit (49).
Error while decoding stream #0:1: Invalid data found when processing input
手順は機能していますが、いくつかの入力ファイルを使用すると、いくつかの問題が発生します。FPS とオーディオピッチの問題: 出力ファイルは可変フレームレートであり、オーディオ速度が間違っています。
「output_N」のFfprobeは以下を生成します。
file 'D:\SharedExp_SSD\Outs\0.51.8\2020-10-30_11-45_LancioTandem-30FPS_1604054749\video_HL\tmp\introEncoded.mp4'
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'introEncoded.mp4': Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.42.100 Duration: 00:00:04.60, start: 0.000000, bitrate: 2707 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 2575 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : Core Media Video
Stream #0:1(ita): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 131 kb/s (default)
Metadata:
handler_name : Core Media Audio
file 'D:\SharedExp_SSD\Outs\0.51.8\2020-10-30_11-45_LancioTandem-30FPS_1604054749\video_HL\tmp\Exp_1488_clip_0.mp4'
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Exp_1488_clip_0.mp4': Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.42.100 Duration: 00:00:40.27, start: 0.000000, bitrate: 8142 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 8221 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : GoPro AVC
timecode : 12:52:03:24
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 69 kb/s (default)
Metadata:
handler_name : GoPro AAC
Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
Metadata:
handler_name : GoPro AVC
timecode : 12:52:03:24 Unsupported codec with id 0 for input stream 2
file 'D:\SharedExp_SSD\Outs\0.51.8\2020-10-30_11-45_LancioTandem-30FPS_1604054749\video_HL\tmp\Exp_1488_clip_1.mp4'
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Exp_1488_clip_1.mp4': Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.42.100 Duration: 00:00:05.03, start: 0.000000, bitrate: 8460 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 10239 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : GoPro AVC
timecode : 13:22:01:01
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 69 kb/s (default)
Metadata:
handler_name : GoPro AAC
Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
handler_name : GoPro AVC
timecode : 13:22:01:01 Unsupported codec with id 0 for input stream 2
file 'D:\SharedExp_SSD\Outs\0.51.8\2020-10-30_11-45_LancioTandem-30FPS_1604054749\video_HL\tmp\Exp_1488_clip_2.mp4'
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Exp_1488_clip_2.mp4': Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.42.100 Duration: 00:00:08.03, start: 0.000000, bitrate: 8926 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 9303 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : GoPro AVC
timecode : 13:22:01:01
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 69 kb/s (default)
Metadata:
handler_name : GoPro AAC
Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
Metadata:
handler_name : GoPro AVC
timecode : 13:22:01:01 Unsupported codec with id 0 for input stream 2
outputConcat.mp4でffprobeを実行すると、
outputConcat.mp4:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'outputConcat.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.42.100
Duration: 00:00:57.54, start: 0.000000, bitrate: 7900 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 7820 kb/s, 24.28 fps, 25 tbr, 15360 tbn, 50 tbc (default)
Metadata:
handler_name : Core Media Video
Stream #0:1(ita): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 111 kb/s (default)
Metadata:
handler_name : Core Media Audio
outputConcat.mp4 のタイムベースが他のものと異なります。この動作は、オーディオ ストリームの異なるサンプル レート (入力ファイルで気付く唯一の違い) に関連していますか?
ポイント 1) からわかるように、入力 FPS は 25 に設定されており、すべての入力ビデオのコーデックと解像度はまったく同じです。
出力ビデオが入力と同じ FPS を持ち、オーディオ ピッチの問題が発生しないようにビデオを連結するにはどうすればよいですか? これはタイムベースの問題でしょうか?
ありがとう、マルコ
答え1
この問題の部分的な解決策を見つけました。問題は、入力のオーディオサンプルレートが一貫しておらず、最初の変換中にこれを管理していなかったことです。-ar 32000すべての初期変換文字列を追加することで、オーディオピッチの問題を解決しました。fpsが変化する理由をまだ理解しようとしています。