Concat много видео: неправильный FPS и аудио Pitch

2024-9-5 • tag-icon

Concat много видео: неправильный FPS и аудио Pitch

У меня процесс такой:

У меня есть N входных видео; я разрезаю и перекодирую их, используя следующий код:

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"
Я создаю videoArrayFile.txt в следующем формате:

файл 'myFilePath\output_N.mp4' файл 'myFilePath\output_N.mp4' файл 'myFilePath\output_N.mp4' ...
Я объединяю файлы в videoArrayFile.txt с помощью следующей команды:

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"

Это журнал ffmpeg, когда я запускаю указанную выше команду:

[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

Процедура работает, но при использовании некоторых входных файлов я сталкиваюсь с некоторымиПроблема с FPS и высотой звука: выходной файл имеет переменную частоту кадров, а скорость звука неверна.

Ffprobe на "output_N" выдает следующее:

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

В то время как ffprobe на outputConcat.mp4 производит

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

Временная развертка в outputConcat.mp4 отличается от других: связано ли это поведение с разной частотой дискретизации аудиопотоков (единственное отличие, которое я заметил во входных файлах)?

Как видно из пункта 1), входной FPS установлен на 25, и все входные видео имеют абсолютно одинаковый кодек и разрешение.

Как мне объединить видео так, чтобы выходной FPS был таким же, как и входной, и не было проблем с высотой звука? Может ли это быть проблемой временной развертки?

Спасибо, Марко.

решение1

Я нашел частичное решение проблемы: проблема была в том, что частота дискретизации аудио входов не была согласованной, и я не управлял этим во время первого преобразования. Добавив -ar 32000ко всем первоначальным строкам преобразования, я решил проблему с высотой звука. Я все еще пытаюсь понять, почему меняется fps

решение1

Связанный контент