#1171 closed defect (wontfix)
h264 to VP8: "non monotonically increasing dts" with 2 pass and vp8flags altref
Reported by: | temporary | Owned by: | |
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Priority: | normal | Component: | undetermined |
Version: | git-master | Keywords: | webm libvpx |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
vopts="-c:v libvpx -vp8flags altref -rc_lookahead 5" ffmpeg -pass 1 -i testv.mkv -f rawvideo $vopts -y /dev/null ffmpeg -pass 2 -i testv.mkv $vopts -y testout.mkv
ffmpeg version git-2012-04-05-c99bdd5 Copyright (c) 2000-2012 the FFmpeg developers built on Apr 5 2012 17:19:33 with gcc 4.6.3 configuration: --prefix=/usr --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-postproc --enable-x11grab --enable-shared libavutil 51. 44.100 / 51. 44.100 libavcodec 54. 12.100 / 54. 12.100 libavformat 54. 3.100 / 54. 3.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 66.101 / 2. 66.101 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 10.100 / 0. 10.100 libpostproc 52. 0.100 / 52. 0.100 Input #0, matroska,webm, from 'testv.mkv': Metadata: AACAOT : 2 AUDIOCHANNELS : 2 AVCLEVEL : 32 AVCPROFILE : 77 MOOVPOSITION : 28 VIDEOFRAMERATE : 25 ENCODER : Lavf54.3.100 Duration: 00:00:01.04, start: 0.000000, bitrate: 2331 kb/s Stream #0:0: Video: h264 (Main), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1k fps, 25 tbr, 1k tbn, 50 tbc (default) [buffer @ 0x2639d40] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:flags=2 [libvpx @ 0x26403e0] v1.0.0 Output #0, rawvideo, to '/dev/null': Metadata: AACAOT : 2 AUDIOCHANNELS : 2 AVCLEVEL : 32 AVCPROFILE : 77 MOOVPOSITION : 28 VIDEOFRAMERATE : 25 encoder : Lavf54.3.100 Stream #0:0: Video: vp8, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, pass 1, 200 kb/s, 90k tbn, 25 tbc (default) Stream mapping: Stream #0:0 -> #0:0 (h264 -> libvpx) Press [q] to stop, [?] for help frame= 12 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/sframe= 26 fps= 20 q=0.0 Lsize= 0kB time=00:00:00.00 bitrate= 0.0kbits/s dup=1 drop=0 video:0kB audio:0kB global headers:0kB muxing overhead -nan% Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used) ffmpeg version git-2012-04-05-c99bdd5 Copyright (c) 2000-2012 the FFmpeg developers built on Apr 5 2012 17:19:33 with gcc 4.6.3 configuration: --prefix=/usr --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-postproc --enable-x11grab --enable-shared libavutil 51. 44.100 / 51. 44.100 libavcodec 54. 12.100 / 54. 12.100 libavformat 54. 3.100 / 54. 3.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 66.101 / 2. 66.101 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 10.100 / 0. 10.100 libpostproc 52. 0.100 / 52. 0.100 Input #0, matroska,webm, from 'testv.mkv': Metadata: AACAOT : 2 AUDIOCHANNELS : 2 AVCLEVEL : 32 AVCPROFILE : 77 MOOVPOSITION : 28 VIDEOFRAMERATE : 25 ENCODER : Lavf54.3.100 Duration: 00:00:01.04, start: 0.000000, bitrate: 2331 kb/s Stream #0:0: Video: h264 (Main), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1k fps, 25 tbr, 1k tbn, 50 tbc (default) [buffer @ 0x1af4d40] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:flags=2 [libvpx @ 0x1afb3e0] v1.0.0 Output #0, matroska, to 'testout.mkv': Metadata: AACAOT : 2 AUDIOCHANNELS : 2 AVCLEVEL : 32 AVCPROFILE : 77 MOOVPOSITION : 28 VIDEOFRAMERATE : 25 encoder : Lavf54.3.100 Stream #0:0: Video: vp8, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, pass 2, 200 kb/s, 1k tbn, 25 tbc (default) Stream mapping: Stream #0:0 -> #0:0 (h264 -> libvpx) Press [q] to stop, [?] for help [matroska @ 0x1afaca0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 80 >= 80 av_interleaved_write_frame(): Invalid argument
I get no error in 1 pass mode, when I remove "-vp8flags altref", or with "-rc_lookahead" < 5.
The source file was in flv format and was converted to mkv with ffmpeg (a simple copy), but the error also happens with the source flv.
Attachments (1)
Change History (7)
by , 12 years ago
comment:1 by , 12 years ago
comment:2 by , 12 years ago
Despite several people (including me) pointing out the issues, VP8 went with this idiotic design for altref.
This means that you can't really mux stuff encoded with altref in any other format that webm without creating invalid files.
So either
1) do not use altref
2) use webm as container
comment:3 by , 12 years ago
Thanks but I haven’t been able to find any explanation about this invalid mkv files problem on the web. I thought webm was supposed to be a subset of mkv? Also I have already encoded such a file and it was playable by VLC and mplayer.
However I can confirm that changing “testout.mkv” to “testout.webm” does remove the error!
comment:4 by , 12 years ago
Keywords: | webm libvpx added |
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Resolution: | → wontfix |
Status: | new → closed |
Afaiu, this is not a bug in FFmpeg, if somebody disagrees, please reopen the ticket.
comment:5 by , 12 years ago
Shouldn’t ffmpeg at least provide a more understandable error message, such as “altref requires webm output format (and 2 pass)”?
comment:6 by , 12 years ago
First about matroska: it is possible altref is supported in that too, but if so it is a rather new feature and might break things on older players.
Worse, at least so far it is not possible to enable that feature only for VP8, so that might lead to silently creating broken files.
A better error message would be nice, but I do not know how to reliably detect that situation, the error message can be caused by altref but it can be an FFmpeg bug just as well.
I forgot: this is with libvpx 1.0.0