Alphamoose <[email protected]> added the comment:
Every slice in interlaced raw-264 is handled as one frame, although pairs of
slices are clearly marked as two fields of one frame (according to num_frame,
field_pic_flag). Resulting in double frame rate and dropped frames when encoding
as 25fps.
Sample file attached.
ffmpeg.exe -i E:\DVB\tmp\field_frame_detection.264
FFmpeg version SVN-r25685, Copyright (c) 2000-2010 the FFmpeg developers
built on Nov 7 2010 04:09:14 with gcc 4.4.2
configuration: --enable-gpl --enable-version3 --enable-libgsm
--enable-pthreads --enable-libvorbis --enable-libtheora --enable-libspeex
--enable-libmp3lame --enable-libopenjpeg --enable-libschroedinger
--enable-libopencore_amrwb --enable-libopencore_amrnb --enable-libvpx
--disable-decoder=libvpx --arch=x86 --enable-runtime-cpudetect --enable-libxvid
--enable-libx264 --extra-libs='-lx264 -lpthread' --enable-librtmp
--extra-libs='-lrtmp -lpolarssl -lws2_32 -lwinmm' --target-os=mingw32
--enable-avisynth --cross-prefix=i686-mingw32- --cc='ccache i686-mingw32-gcc'
--enable-memalign-hack
libavutil 50.32. 6 / 50.32. 6
libavcore 0.12. 0 / 0.12. 0
libavcodec 52.94. 3 / 52.94. 3
libavformat 52.84. 0 / 52.84. 0
libavdevice 52. 2. 2 / 52. 2. 2
libavfilter 1.56. 0 / 1.56. 0
libswscale 0.12. 0 / 0.12. 0
[h264 @ 019ce650] mmco: unref short failure
Last message repeated 1 times
[h264 @ 019cbd00] max_analyze_duration reached
[h264 @ 019cbd00] Estimating duration from bitrate, this may be inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1)
-> 25.00 (50/2)
Input #0, h264, from 'E:\DVB\tmp\field_frame_detection.264':
Duration: N/A, bitrate: N/A
Stream #0.0: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 50 fps, 25
tbr, 1200k tbn, 50 tbc
At least one output file must be specified
First part of output of mpeg4ip's h264_parse:
h264_parse.exe - mpeg4ip version 1.5.0.1
Nal length 6 start code 4 bytes
ref 0 type 9 Access unit delimeter
primary_pic_type: 0
Nal length 30 start code 4 bytes
ref 1 type 7 Sequence parameter set
profile: 100
constaint_set0_flag: 0
constaint_set1_flag: 0
constaint_set2_flag: 0
constaint_set3_flag: 0
level_idc: 40
seq parameter set id: 0
chroma format idx: 1
bit depth luma minus8: 0
bit depth chroma minus8: 0
Qpprime Y Zero Transform Bypass flag: 0
Seq Scaling Matrix Present Flag: 0
log2_max_frame_num_minus4: 5
pic_order_cnt_type: 0
log2_max_pic_order_cnt_lsb_minus4: 5
num_ref_frames: 4
gaps_in_frame_num_value_allowed_flag: 0
pic_width_in_mbs_minus1: 119 (1920)
pic_height_in_map_minus1: 33
frame_mbs_only_flag: 0
derived height: 1088
mb_adaptive_frame_field_flag: 0
direct_8x8_inference_flag: 1
frame_cropping_flag: 1
frame_crop_left_offset: 0
frame_crop_right_offset: 0
frame_crop_top_offset: 0
frame_crop_bottom_offset: 2
vui_parameters_present_flag: 1
aspect_ratio_info_present_flag: 1
aspect_ratio_idc:1
overscan_info_present_flag: 0
video_signal_info_present_flag: 1
video_format: 0
video_full_range_flag: 0
colour_description_present_flag: 1
colour_primaries: 1
transfer_characteristics: 1
matrix_coefficients: 1
chroma_loc_info_present_flag: 0
timing_info_present_flag: 1
num_units_in_tick: 1
time_scale: 50
fixed_frame_scale: 1
nal_hrd_parameters_present_flag: 0
vcl_hrd_parameters_present_flag: 0
pic_struct_present_flag: 1
Nal length 8 start code 4 bytes
ref 1 type 8 Picture parameter set
pic_parameter_set_id: 0
seq_parameter_set_id: 0
entropy_coding_mode_flag: 1
pic_order_present_flag: 0
num_slice_groups_minus1: 0
num_ref_idx_l0_active_minus1: 0
num_ref_idx_l1_active_minus1: 0
weighted_pred_flag: 0
weighted_bipred_idc: 0
pic_init_qp_minus26: 0
pic_init_qs_minus26: 0
chroma_qp_index_offset: 0
deblocking_filter_control_present_flag: 1
constrained_intra_pred_flag: 0
redundant_pic_cnt_present_flag: 0
Nal length 15 start code 4 bytes
ref 0 type 6 SEI
payload_type: 0 buffering_period
payload_size: 1 0xc0
seq_parameter_set_id: 0
payload_type: 6 recovery_point
payload_size: 1 0xc4
recovery_frame_cnt: 0
exact_match_flag: 1
broken_link_flag: 0
changing_slice_group_idc: 0
payload_type: 1 pic_timing
payload_size: 1 0x14
pict_struct: 1
clock_timestamp_flag[0]: 0
Nal length 23650 start code 4 bytes
ref 1 type 1 Coded slice of non-IDR picture
first_mb_in_slice: 0
slice_type: 2 (I)
pic_parameter_set_id: 0
frame_num: 15 (9 bits)
field_pic_flag: 1
bottom_field_flag: 0
pic_order_cnt_lsb: 64
Nal length 6 start code 4 bytes
ref 0 type 9 Access unit delimeter
primary_pic_type: 1
Nal length 9 start code 4 bytes
ref 0 type 6 SEI
payload_type: 1 pic_timing
payload_size: 1 0x24
string is "$"
pict_struct: 2
clock_timestamp_flag[0]: 0
Nal length 14468 start code 4 bytes
ref 1 type 1 Coded slice of non-IDR picture
first_mb_in_slice: 0
slice_type: 0 (P)
pic_parameter_set_id: 0
frame_num: 15 (9 bits)
field_pic_flag: 1
bottom_field_flag: 1
pic_order_cnt_lsb: 65
Nal length 6 start code 4 bytes
ref 0 type 9 Access unit delimeter
primary_pic_type: 2
Nal length 9 start code 4 bytes
ref 0 type 6 SEI
payload_type: 1 pic_timing
payload_size: 1 0x14
pict_struct: 1
clock_timestamp_flag[0]: 0
Nal length 8292 start code 4 bytes
ref 1 type 1 Coded slice of non-IDR picture
first_mb_in_slice: 0
slice_type: 1 (B)
pic_parameter_set_id: 0
frame_num: 16 (9 bits)
field_pic_flag: 1
bottom_field_flag: 0
pic_order_cnt_lsb: 60
Nal length 6 start code 4 bytes
ref 0 type 9 Access unit delimeter
primary_pic_type: 2
Nal length 9 start code 4 bytes
ref 0 type 6 SEI
payload_type: 1 pic_timing
payload_size: 1 0x24
string is "$"
pict_struct: 2
clock_timestamp_flag[0]: 0
Nal length 15310 start code 4 bytes
ref 1 type 1 Coded slice of non-IDR picture
first_mb_in_slice: 0
slice_type: 1 (B)
pic_parameter_set_id: 0
frame_num: 16 (9 bits)
field_pic_flag: 1
bottom_field_flag: 1
pic_order_cnt_lsb: 61
Nal length 6 start code 4 bytes
ref 0 type 9 Access unit delimeter
primary_pic_type: 2
Nal length 9 start code 4 bytes
ref 0 type 6 SEI
payload_type: 1 pic_timing
payload_size: 1 0x14
pict_struct: 1
clock_timestamp_flag[0]: 0
Nal length 15081 start code 4 bytes
ref 0 type 1 Coded slice of non-IDR picture
first_mb_in_slice: 0
slice_type: 1 (B)
pic_parameter_set_id: 0
frame_num: 17 (9 bits)
field_pic_flag: 1
bottom_field_flag: 0
pic_order_cnt_lsb: 58
Nal length 6 start code 4 bytes
ref 0 type 9 Access unit delimeter
primary_pic_type: 2
Nal length 9 start code 4 bytes
ref 0 type 6 SEI
payload_type: 1 pic_timing
payload_size: 1 0x24
string is "$"
pict_struct: 2
clock_timestamp_flag[0]: 0
Nal length 14934 start code 4 bytes
ref 0 type 1 Coded slice of non-IDR picture
first_mb_in_slice: 0
slice_type: 1 (B)
pic_parameter_set_id: 0
frame_num: 17 (9 bits)
field_pic_flag: 1
bottom_field_flag: 1
pic_order_cnt_lsb: 59
File 'field_frame_detection.264' not attached - you can download it from
https://roundup.ffmpeg.org/file1156.
----------
priority: normal -> important
status: closed -> open
substatus: needs_more_info -> approved
________________________________________________
FFmpeg issue tracker <[email protected]>
<https://roundup.ffmpeg.org/issue1457>
________________________________________________
