Opened 7 years ago
Closed 7 years ago
#6090 closed defect (fixed)
ffmpeg duplicates the first frame when decoding attached hevc-file.
| Reported by: | figgis | Owned by: | |
|---|---|---|---|
| Priority: | important | Component: | undetermined |
| Version: | git-master | Keywords: | hevc dts regression |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | yes | |
| Analyzed by developer: | no |
Description
Summary of the bug:
ffmpeg duplicates the first frame when decoding attached hevc-file.
File was not encoded by ffmpeg. The original BQMall is 601 frames long. The hevc reference decoder produce the correct output.
How to reproduce:
$ ffmpeg -version ffmpeg version N-83136-gbdbbb8f Copyright (c) 2000-2017 the FFmpeg developers built with gcc 4.9.2 (Debian 4.9.2-10) configuration: --enable-gpl --enable-libx264 libavutil 55. 43.100 / 55. 43.100 libavcodec 57. 73.100 / 57. 73.100 libavformat 57. 62.100 / 57. 62.100 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 69.100 / 6. 69.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 $ ffmpeg -i BQMall_832x480_60_QP29.hevc tmp.yuv
Using a python-tool I wrote to calculate the sha1sum of all frames in a ycbcr 420 file (https://github.com/figgis/yuv_checksum)
frame sha1 ===== ======================================== 0000 baa271df1987798b0847e1d9eea20df78d301f8f 0001 baa271df1987798b0847e1d9eea20df78d301f8f 0002 6b8d13a219066989ee5e0209f2aed7ba1fc2e56f
Size of output
$ stat -c "%s" BQMall_832x480_60.yuv tmp.yuv 360023040 360622080 In [2]: 360622080-360023040 Out[2]: 599040 In [3]: 832*480*3/2 Out[3]: 599040 # One frame too many
Attachments (1)
Change History (7)
by , 7 years ago
| Attachment: | BQMall_832x480_60_QP46.hevc added |
|---|
comment:1 by , 7 years ago
| Component: | undetermined → avcodec |
|---|---|
| Keywords: | dts added; duplicate frame removed |
Replying to figgis:
$ ffmpeg -i BQMall_832x480_60_QP29.hevc tmp.yuv
Please provide the command line and the complete, uncut console output for the file you attached to make this a valid ticket.
comment:2 by , 7 years ago
$ ffmpeg -i BQMall_832x480_60_QP46.hevc tmp.yuv
ffmpeg version N-83136-gbdbbb8f Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.9.2 (Debian 4.9.2-10)
configuration: --enable-gpl --enable-libx264
libavutil 55. 43.100 / 55. 43.100
libavcodec 57. 73.100 / 57. 73.100
libavformat 57. 62.100 / 57. 62.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, hevc, from 'BQMall_832x480_60_QP46.hevc':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: hevc (Main), yuv420p(tv), 832x480, 60 fps, 60 tbr, 1200k tbn, 60 tbc
Output #0, rawvideo, to 'tmp.yuv':
Metadata:
encoder : Lavf57.62.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 832x480, q=2-31, 200 kb/s, 60 fps, 60 tbn, 60 tbc
Metadata:
encoder : Lavc57.73.100 rawvideo
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
frame= 602 fps=0.0 q=-0.0 Lsize= 352170kB time=00:00:10.05 bitrate=287062.4kbits/s dup=1 drop=0 speed=34.9x
video:352170kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
comment:3 by , 7 years ago
I increased the loglevel.
$ ffmpeg -loglevel 40 -y -i BQMall_832x480_60_QP46.hevc tmp.yuv
ffmpeg version N-83136-gbdbbb8f Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.9.2 (Debian 4.9.2-10)
configuration: --enable-gpl --enable-libx264
libavutil 55. 43.100 / 55. 43.100
libavcodec 57. 73.100 / 57. 73.100
libavformat 57. 62.100 / 57. 62.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
[hevc @ 0x2ce3380] max_analyze_duration 5000000 reached at 5000000 microseconds st:0
Input #0, hevc, from 'BQMall_832x480_60_QP46.hevc':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: hevc (Main), 1 reference frame, yuv420p(tv), 832x480, 60 fps, 60 tbr, 1200k tbn, 60 tbc
[graph 0 input from stream 0:0 @ 0x2df3300] w:832 h:480 pixfmt:yuv420p tb:1/1200000 fr:60/1 sar:0/1 sws_param:flags=2
Output #0, rawvideo, to 'tmp.yuv':
Metadata:
encoder : Lavf57.62.100
Stream #0:0: Video: rawvideo, 1 reference frame (I420 / 0x30323449), yuv420p, 832x480, q=2-31, 200 kb/s, 60 fps, 60 tbn, 60 tbc
Metadata:
encoder : Lavc57.73.100 rawvideo
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
*** 1 dup!
No more output streams to write to, finishing.
frame= 602 fps=0.0 q=-0.0 Lsize= 352170kB time=00:00:10.05 bitrate=287062.4kbits/s dup=1 drop=0 speed=32.4x
video:352170kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
Input file #0 (BQMall_832x480_60_QP46.hevc):
Input stream #0:0 (video): 601 packets read (322614 bytes); 601 frames decoded;
Total: 601 packets (322614 bytes) demuxed
Output file #0 (tmp.yuv):
Output stream #0:0 (video): 602 frames encoded; 602 packets muxed (360622080 bytes);
Total: 602 packets (360622080 bytes) muxed
This is interesting. ffmpeg reports a *** 1 dup! None of my other decoders or analysis tools does this.
comment:4 by , 7 years ago
| Component: | avcodec → undetermined |
|---|---|
| Keywords: | regression added |
| Priority: | normal → important |
| Reproduced by developer: | set |
| Status: | new → open |
Regression since c5092025901b37aa5de4f290afb61fc5377eb79d, related to ticket #3052.
comment:5 by , 7 years ago
using -vsync passthrough seems to solve the problem. Still curious about this behaviour though.
$ ffmpeg -loglevel 40 -y -vsync passthrough -i BQMall_832x480_60_QP46.hevc tmp.yuv
ffmpeg version N-83136-gbdbbb8f Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.9.2 (Debian 4.9.2-10)
configuration: --enable-gpl --enable-libx264
libavutil 55. 43.100 / 55. 43.100
libavcodec 57. 73.100 / 57. 73.100
libavformat 57. 62.100 / 57. 62.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
[hevc @ 0x25173e0] max_analyze_duration 5000000 reached at 5000000 microseconds st:0
Input #0, hevc, from 'BQMall_832x480_60_QP46.hevc':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: hevc (Main), 1 reference frame, yuv420p(tv), 832x480, 60 fps, 60 tbr, 1200k tbn, 60 tbc
[graph 0 input from stream 0:0 @ 0x2627780] w:832 h:480 pixfmt:yuv420p tb:1/1200000 fr:60/1 sar:0/1 sws_param:flags=2
Output #0, rawvideo, to 'tmp.yuv':
Metadata:
encoder : Lavf57.62.100
Stream #0:0: Video: rawvideo, 1 reference frame (I420 / 0x30323449), yuv420p, 832x480, q=2-31, 200 kb/s, 60 fps, 60 tbn, 60 tbc
Metadata:
encoder : Lavc57.73.100 rawvideo
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
No more output streams to write to, finishing.
frame= 601 fps=0.0 q=-0.0 Lsize= 351585kB time=00:00:10.03 bitrate=287061.6kbits/s speed= 34x
video:351585kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
Input file #0 (BQMall_832x480_60_QP46.hevc):
Input stream #0:0 (video): 601 packets read (322614 bytes); 601 frames decoded;
Total: 601 packets (322614 bytes) demuxed
Output file #0 (tmp.yuv):
Output stream #0:0 (video): 601 frames encoded; 601 packets muxed (360023040 bytes);
Total: 601 packets (360023040 bytes) muxed
comment:6 by , 7 years ago
| Resolution: | → fixed |
|---|---|
| Status: | open → closed |
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QP29 was to large (3.5MB) Same behavior can bee seen in this file using QP46.