Tengo un proceso como este:
tengo N entrada de vídeo; Los corto y transcodifico usando el siguiente código:
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 medio -perfil alto -b:v 8000k -bufsize 8000k -maxrate 10000k -qmin 0 -g 250 -bf 2 -i_qfactor 0,75 -b_qfactor 1,1 "output_N.mp4"
Creo un videoArrayFile.txt en el siguiente formato:
archivo 'myFilePath\output_N.mp4' archivo 'myFilePath\output_N.mp4' archivo 'myFilePath\output_N.mp4' ...
Concateno los archivos en videoArrayFile.txt usando el siguiente comando:
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"
Este es el registro de ffmpeg cuando ejecuto el comando anterior:
[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
El procedimiento está funcionando pero, al utilizar algunos archivos de entrada, me enfrento a algunosProblema de FPS y tono de audio: el archivo de salida tiene una velocidad de fotogramas variable y la velocidad del audio es incorrecta.
Ffprobe en "output_N" produce lo siguiente:
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
Mientras ffprobe en outputConcat.mp4 produce
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
La base de tiempo en outputConcat.mp4 cambia con respecto a los demás: ¿este comportamiento está relacionado con las diferentes frecuencias de muestreo de las transmisiones de audio (la única diferencia que puedo notar en los archivos de entrada)?
Como puede ver en el punto 1), el FPS de entrada está configurado en 25 y todo el vídeo de entrada tiene exactamente el mismo códec y resolución.
¿Cómo puedo concatenar los videos para que el de salida tenga el mismo FPS de las entradas y no haya problemas de tono de audio? ¿Puede ser el problema de la base de tiempo?
Gracias, Marco
Respuesta1
Encontré una solución parcial al problema: el problema era que la frecuencia de muestreo de audio de las entradas no es coherente y no lo logré durante la primera conversión. Agregando -ar 32000a toda la cadena de conversión inicial resolví el problema del tono del audio. Todavía estoy tratando de entender por qué cambian los fps.