#1437: probe less than the whole file with -show_frames -------------------------------------+----------------------------------- Reporter: mdsh | Owner: stefano Type: enhancement | Status: open Priority: wish | Component: FFprobe Version: git-master | Resolution: Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+----------------------------------- Description changed by ubitux: Old description:

I'd like to probe a file to get interlaced_frame="1" top_field_first="1" - which I believe is only available in -show_frames.

My file is 30 minutes log - I only want the data from the first frame.

I can't see anything in -h to answer this question. The ffmpeg -vframes, -frames:v and -t are not listed in ffprobe's help, and do not work.

I usually use FFprobe with a -probesize, and that is also ignored with -show_frames.

Stefano suggested "And of course you can get it with a crude trick, you trim the file *physically* in order to reduce the amount of data to be decoded" but that's a workaround I'd like to avoid.

example current file based command line:

ffprobe -show_format -show_streams -show_frames -probesize 40000 -print_format xml "tortoise.mxf"

ffprobe version N-41487-gee1748a Copyright (c) 2007-2012 the FFmpeg developers built on Jun 10 2012 17:04:40 with llvm_gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00) configuration: --prefix=/Users/mdsh/ffmpeg --arch=x86_64 --enable- ffplay --enable-ffprobe --enable-shared --disable-indev=jack --enable-gpl --enable-nonfree --enable-pthreads --enable-libfaac --enable-libx264 libavutil 51. 56.100 / 51. 56.100 libavcodec 54. 25.100 / 54. 25.100 libavformat 54. 6.101 / 54. 6.101 libavdevice 54. 0.100 / 54. 0.100 libavfilter 2. 78.101 / 2. 78.101 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 15.100 / 0. 15.100 libpostproc 52. 0.100 / 52. 0.100 [mxf @ 0x7fddb081ae00] Stream #0: not enough frames to estimate rate; consider increasing probesize [mxf @ 0x7fddb081ae00] Stream #1: not enough frames to estimate rate; consider increasing probesize Input #0, mxf, from 'tortoise.mxf': Metadata: timecode : 10:53:51:04 Duration: 00:28:21.92, start: 0.000000, bitrate: 42598 kb/s Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 720x608 [SAR 608:405 DAR 16:9], 30000 kb/s, 25 tbr, 25 tbn, 50 tbc Stream #0:1: Audio: pcm_s16le, 48000 Hz, 4 channels, s16, 3072 kb/s <?xml version="1.0" encoding="UTF-8"?> <ffprobe> <frames> <frame media_type="video" key_frame="1" pkt_pts="0" pkt_pts_time="0.000000" pkt_dts="0" pkt_dts_time="0.000000" pkt_duration="1" pkt_duration_time="0.040000" pkt_pos="7168" width="720" height="608" pix_fmt="yuv422p" sample_aspect_ratio="608:405" pict_type="I" coded_picture_number="0" display_picture_number="0" interlaced_frame="1" top_field_first="1" repeat_pict="0" reference="3"/> <frame media_type="audio" key_frame="1" pkt_pts="0" pkt_pts_time="0.000000" pkt_dts="0" pkt_dts_time="0.000000" pkt_duration="1" pkt_duration_time="0.040000" pkt_pos="157696" sample_fmt="s16" nb_samples="1920"/> ... goes on for a long time - you *really* don't want the uncut output

New description: I'd like to probe a file to get interlaced_frame="1" top_field_first="1" - which I believe is only available in -show_frames. My file is 30 minutes log - I only want the data from the first frame. I can't see anything in -h to answer this question. The ffmpeg -vframes, -frames:v and -t are not listed in ffprobe's help, and do not work. I usually use FFprobe with a -probesize, and that is also ignored with -show_frames. Stefano suggested "And of course you can get it with a crude trick, you trim the file *physically* in order to reduce the amount of data to be decoded" but that's a workaround I'd like to avoid. example current file based command line: {{{ % ffprobe -show_format -show_streams -show_frames -probesize 40000 -print_format xml "tortoise.mxf" ffprobe version N-41487-gee1748a Copyright (c) 2007-2012 the FFmpeg developers built on Jun 10 2012 17:04:40 with llvm_gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00) configuration: --prefix=/Users/mdsh/ffmpeg --arch=x86_64 --enable-ffplay --enable-ffprobe --enable-shared --disable-indev=jack --enable-gpl --enable-nonfree --enable-pthreads --enable-libfaac --enable-libx264 libavutil 51. 56.100 / 51. 56.100 libavcodec 54. 25.100 / 54. 25.100 libavformat 54. 6.101 / 54. 6.101 libavdevice 54. 0.100 / 54. 0.100 libavfilter 2. 78.101 / 2. 78.101 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 15.100 / 0. 15.100 libpostproc 52. 0.100 / 52. 0.100 [mxf @ 0x7fddb081ae00] Stream #0: not enough frames to estimate rate; consider increasing probesize [mxf @ 0x7fddb081ae00] Stream #1: not enough frames to estimate rate; consider increasing probesize Input #0, mxf, from 'tortoise.mxf': Metadata: timecode : 10:53:51:04 Duration: 00:28:21.92, start: 0.000000, bitrate: 42598 kb/s Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 720x608 [SAR 608:405 DAR 16:9], 30000 kb/s, 25 tbr, 25 tbn, 50 tbc Stream #0:1: Audio: pcm_s16le, 48000 Hz, 4 channels, s16, 3072 kb/s <?xml version="1.0" encoding="UTF-8"?> <ffprobe> <frames> <frame media_type="video" key_frame="1" pkt_pts="0" pkt_pts_time="0.000000" pkt_dts="0" pkt_dts_time="0.000000" pkt_duration="1" pkt_duration_time="0.040000" pkt_pos="7168" width="720" height="608" pix_fmt="yuv422p" sample_aspect_ratio="608:405" pict_type="I" coded_picture_number="0" display_picture_number="0" interlaced_frame="1" top_field_first="1" repeat_pict="0" reference="3"/> <frame media_type="audio" key_frame="1" pkt_pts="0" pkt_pts_time="0.000000" pkt_dts="0" pkt_dts_time="0.000000" pkt_duration="1" pkt_duration_time="0.040000" pkt_pos="157696" sample_fmt="s16" nb_samples="1920"/> [...] }}} goes on for a long time - you *really* don't want the uncut output -- -- Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1437#comment:2> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker