FFMPEG extrahiert eine unzumutbare Anzahl von I-Frames

1332
mooky

ffmpeg version git-2014-01-14-abcde

ffprobe -show_frames a.mp4 | grep pict_type=I | wc identifiziert 142 I-Frames.

ffmpeg -i a.mp4 -filter:v select='eq(pict_type\,I)' I.%03d.png erzeugt Tausende von PNGs.

Wie kann ich nur die 142 extrahieren?

EDIT # 1 :

$ ffmpeg -i a.mp4 -filter:v select='eq(pict_type\,I)' I.%03d.png ffmpeg version git-2014-01-14-abcde copyright (c) 2000-2014 the FFmpeg developers built on Jan 14 2014 09:10:34 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) configuration: <snip> libavutil 52. 62.100 / 52. 62.100 libavcodec 55. 48.101 / 55. 48.101 libavformat 55. 23.103 / 55. 23.103 libavdevice 55. 5.102 / 55. 5.102 libavfilter 4. 1.100 / 4. 1.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 17.104 / 0. 17.104 libpostproc 52. 3.100 / 52. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 1970-01-01 00:00:00 encoder : Lavf53.29.100 Duration: 00:19:02.63, start: 0.000000, bitrate: 128 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 43 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default) Metadata: creation_time : 1970-01-01 00:00:00 handler_name : VideoHandler Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 75 kb/s (default) Metadata: creation_time : 1970-01-01 00:00:00 handler_name : SoundHandler Output #0, image2, to 'I.%03d.png': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf55.23.103 Stream #0:0(und): Video: png, rgb24, 960x540 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 30 tbc (default) Metadata: creation_time : 1970-01-01 00:00:00 handler_name : VideoHandler Stream mapping: Stream #0:0 -> #0:0 (h264 -> png) Press [q] to stop, [?] for help

EDIT # 2:

Press [q] to stop, [?] for help frame=34228 fps=9.6 q=0.0 Lsize=N/A time=00:19:00.93 bitrate=N/A dup=34086 drop=0  video:5583968kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000000%
1
Ich habe eine Idee, aber ich muss Ihre Konsolenausgabe sehen. Zeigen Sie die vollständige Ausgabe der `ffmpeg`-Konsole Ihres` ffmpeg`-Befehls an. Sie sollten diese Informationen immer angeben, wenn Sie nach der Hilfe von `ffmpeg` fragen. LordNeckbeard vor 10 Jahren 0

1 Antwort auf die Frage

3
mooky

http://www.ffmpeg.org/ffmpeg-filters.html#Examples-10

-vsync 0

ffmpeg -i a.mp4 -filter:v select='eq(pict_type\,I)' -vsync 0 I.%06d.png

$ ffmpeg -i a.mp4 -filter:v select='eq(pict_type\,I)' -vsync 0 I.%06d.png ffmpeg version git-2014-01-14-abcde Copyright (c) 2000-2014 the FFmpeg developers built on Jan 14 2014 09:10:34 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) configuration: <snip> libavutil 52. 62.100 / 52. 62.100 libavcodec 55. 48.101 / 55. 48.101 libavformat 55. 23.103 / 55. 23.103 libavdevice 55. 5.102 / 55. 5.102 libavfilter 4. 1.100 / 4. 1.100 libswscale 2. 5.101 / 2. 5.101 libswresample 0. 17.104 / 0. 17.104 libpostproc 52. 3.100 / 52. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 1970-01-01 00:00:00 encoder : Lavf53.29.100 Duration: 00:19:02.63, start: 0.000000, bitrate: 128 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 43 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default) Metadata: creation_time : 1970-01-01 00:00:00 handler_name : VideoHandler Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 75 kb/s (default) Metadata: creation_time : 1970-01-01 00:00:00 handler_name : SoundHandler Output #0, image2, to 'I.%06d.png': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf55.23.103 Stream #0:0(und): Video: png, rgb24, 960x540 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 30 tbc (default) Metadata: creation_time : 1970-01-01 00:00:00 handler_name : VideoHandler Stream mapping: Stream #0:0 -> #0:0 (h264 -> png) Press [q] to stop, [?] for help frame= 142 fps=1.0 q=0.0 Lsize=N/A time=00:19:00.93 bitrate=N/A  video:22992kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.000093%

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