Quando utilizzo FFMPEG per convertire un video da MP4 a M3U8, usando il comando seguente,
ffmpeg -i op.mp4 -b:v 128k -flags -global_header -map 0:0 -map 0:1 -f segment -segment_time 4 -segment_list_size 0 -segment_list op.m3u8 -segment_format mpegts op%05d.ts
Ricevo il seguente avviso:
Non-monotonous DTS in output stream 0:1; previous: 347527, current: 346508; changing to 347528. This may result in incorrect timestamps in the output file.
Viene generato M3U8, ma solo l'audio viene riprodotto sul lettore quicktime.
Sia il Sample MP4 che M3U8 sono disponibili qui
Quindi, vorrei sapere
Motivo alla base di questo errore. È un mp4 corrotto o un problema durante la conversione. Il m3u8 è riproducibile non è riproducibile correttamente in quicktime. Arriva solo l'audio, nessun video.
Come posso eventualmente risolvere questo problema
Uscita console FFMPEG completa:
ffmpeg version git-2013-06-06-c51654f Copyright (c) 2000-2013 the FFmpeg developers
built on Jun 6 2013 12:54:24 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
libavutil 52. 35.100 / 52. 35.100
libavcodec 55. 15.100 / 55. 15.100
libavformat 55. 8.102 / 55. 8.102
libavdevice 55. 2.100 / 55. 2.100
libavfilter 3. 75.101 / 3. 75.101
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'op.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.8.102
Duration: 00:00:06.00, start: 0.010000, bitrate: 679 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x364 [SAR 1:1 DAR 160:91], 590 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s
Metadata:
handler_name : SoundHandler
[segment @ 0x32e1d60] Codec for stream 0 does not use global headers but container format requires global headers
[segment @ 0x32e1d60] Codec for stream 1 does not use global headers but container format requires global headers
Output #0, segment, to 'op%05d.ts':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.8.102
Stream #0:0(eng): Video: mpeg2video, yuv420p, 640x364 [SAR 1:1 DAR 160:91], q=2-31, 128 kb/s, 90k tbn, 25 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: mp2, 44100 Hz, stereo, s16, 128 kb/s
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mpeg2video)
Stream #0:1 -> #0:1 (aac -> mp2)
Press [q] to stop, [?] for help
[segment @ 0x32e1d60] Non-monotonous DTS in output stream 0:1; previous: 347527, current: 346508; changing to 347528. This may result in incorrect timestamps in the output file.
frame= 109 fps=0.0 q=31.0 size=N/A time=00:00:04.29 bitrate=N/A dup=14 drop=0 frame= 151 fps=0.0 q=24.8 Lsize=N/A time=00:00:06.00 bitrate=N/A dup=14 drop=0
video:350kB audio:96kB subtitle:0 global headers:0kB muxing overhead -100.004823%
Con le opzioni vsync e async, l'errore che appare è "Il codec per lo stream 0 non utilizza le intestazioni globali ma il formato del contenitore richiede le intestazioni globali". Ecco l'output della console:
ffmpeg -i op.mp4 -b:v 128k -flags -global_header -map 0:0 -map 0:1 -f segment -segment_time 4 -segment_list_size 0 -segment_list nop.m3u8 -segment_format mpegts nop%05d.ts
ffmpeg version git-2013-06-06-c51654f Copyright (c) 2000-2013 the FFmpeg developers
built on Jun 6 2013 12:54:24 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
libavutil 52. 35.100 / 52. 35.100
libavcodec 55. 15.100 / 55. 15.100
libavformat 55. 8.102 / 55. 8.102
libavdevice 55. 2.100 / 55. 2.100
libavfilter 3. 75.101 / 3. 75.101
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'op.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.8.102
Duration: 00:00:06.00, start: 0.010000, bitrate: 679 kb/s
Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x364 [SAR 1:1 DAR 160:91], 590 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s
Metadata:
handler_name : SoundHandler
[segment @ 0x3bf3d60] Codec for stream 0 does not use global headers but container format requires global headers
[segment @ 0x3bf3d60] Codec for stream 1 does not use global headers but container format requires global headers
Output #0, segment, to 'nop%05d.ts':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.8.102
Stream #0:0(eng): Video: mpeg2video, yuv420p, 640x364 [SAR 1:1 DAR 160:91], q=2-31, 128 kb/s, 90k tbn, 25 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(eng): Audio: mp2, 44100 Hz, stereo, s16, 128 kb/s
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mpeg2video)
Stream #0:1 -> #0:1 (aac -> mp2)
Press [q] to stop, [?] for help
[segment @ 0x3bf3d60] Non-monotonous DTS in output stream 0:1; previous: 347527, current: 346508; changing to 347528. This may result in incorrect timestamps in the output file.
frame= 119 fps=0.0 q=31.0 size=N/A time=00:00:04.68 bitrate=N/A dup=14 drop=0 frame= 151 fps=0.0 q=24.8 Lsize=N/A time=00:00:06.00 bitrate=N/A dup=14 drop=0
video:350kB audio:96kB subtitle:0 global headers:0kB muxing overhead -100.004823%
-vsync 1 -async 1
?