Hello, I am encoding from an mpeg ts video device to dv format: ffmpeg -i /dev/mydevice -vcodec dvvideo out.dv however, I get glitches in the output video, and errors on the command line like: [mpeg2video @ 0x84d1cc8]00 motion_type at 7 33 [mpeg2video @ 0x84d1cc8]invalid cbp at 1 34 [mpeg2video @ 0x84d1cc8]ac-tex damaged at 0 35 [mpeg2video @ 0x84d1cc8]Warning MVs not available [mpeg2video @ 0x84d1cc8]concealing 675 DC, 675 AC, 675 MV errors If I do: cat /dev/mydevice > myfile.ts then: ffmpeg -i myfile.ts -vcodec dvvideo out2.dv all is well. CPU and memory usage is low (ish ~ 30%), what other limiting factors are there? Many thanks for your help, Peter PS. Full cmd line: ffmpeg -i /dev/mydevice -vcodec dvvideo ~/out.dv FFmpeg version SVN-r10129, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-liba52bin --enable-pp --enable-pthreads -- enable-gpl --disable-strip --extra-cflags=-O2 --extra-cflags=-g -- extra-cflags=-pipe --extra-cflags=-Wall --extra-cflags=-Wp,- D_FORTIFY_SOURCE=2 --extra-cflags=-fexceptions --extra-cflags=-fstack- protector --extra-cflags=--param=ssp-buffer-size=4 --extra-cflags=- m32 --extra-cflags=-march=i386 --extra-cflags=-mtune=generic --extra- cflags=-fasynchronous-unwind-tables libavutil version: 49.5.0 libavcodec version: 51.41.0 libavformat version: 51.12.2 built on Aug 20 2007 17:53:31, gcc: 4.1.2 20070502 (Red Hat 4.1.2-12) Input #0, mpegts, from '/dev/mydevice': Duration: N/A, bitrate: 8172 kb/s Stream #0.0[0x44](eng): Audio: mp2, 48000 Hz, stereo, 192 kb/s Stream #0.1[0x45]: Video: mpeg2video, yuv420p, 720x576, 7980 kb/s, 25.00 fps(r) Output #0, dv, to '/video/out.dv': Stream #0.0: Video: dvvideo, yuv420p, 720x576, q=2-31, 200 kb/s, 25.00 fps(c) Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1
Peter Hill a ?crit :
Hello,
I am encoding from an mpeg ts video device to dv format: ffmpeg -i /dev/mydevice -vcodec dvvideo out.dv
however, I get glitches in the output video, and errors on the command line like: [mpeg2video @ 0x84d1cc8]00 motion_type at 7 33 [mpeg2video @ 0x84d1cc8]invalid cbp at 1 34 [mpeg2video @ 0x84d1cc8]ac-tex damaged at 0 35 [mpeg2video @ 0x84d1cc8]Warning MVs not available [mpeg2video @ 0x84d1cc8]concealing 675 DC, 675 AC, 675 MV errors
The glitches are in the input
If I do: cat /dev/mydevice > myfile.ts then: ffmpeg -i myfile.ts -vcodec dvvideo out2.dv
all is well.
Looks like the device returns incomplete frames.
CPU and memory usage is low (ish ~ 30%), what other limiting factors are there?
Many thanks for your help, Peter
PS. Full cmd line:
ffmpeg -i /dev/mydevice -vcodec dvvideo ~/out.dv FFmpeg version SVN-r10129, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-liba52bin --enable-pp --enable-pthreads -- enable-gpl --disable-strip --extra-cflags=-O2 --extra-cflags=-g -- extra-cflags=-pipe --extra-cflags=-Wall --extra-cflags=-Wp,- D_FORTIFY_SOURCE=2 --extra-cflags=-fexceptions --extra-cflags=-fstack- protector --extra-cflags=--param=ssp-buffer-size=4 --extra-cflags=- m32 --extra-cflags=-march=i386 --extra-cflags=-mtune=generic --extra- cflags=-fasynchronous-unwind-tables libavutil version: 49.5.0 libavcodec version: 51.41.0 libavformat version: 51.12.2 built on Aug 20 2007 17:53:31, gcc: 4.1.2 20070502 (Red Hat 4.1.2-12) Input #0, mpegts, from '/dev/mydevice': Duration: N/A, bitrate: 8172 kb/s Stream #0.0[0x44](eng): Audio: mp2, 48000 Hz, stereo, 192 kb/s Stream #0.1[0x45]: Video: mpeg2video, yuv420p, 720x576, 7980 kb/s, 25.00 fps(r) Output #0, dv, to '/video/out.dv': Stream #0.0: Video: dvvideo, yuv420p, 720x576, q=2-31, 200 kb/s, 25.00 fps(c) Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1
-- Michel Bardiaux R&D Director T +32 [0] 2 790 29 41 F +32 [0] 2 790 29 02 E mailto:mbardiaux at mediaxim.be Mediaxim NV/SA Vorstlaan 191 Boulevard du Souverain Brussel 1160 Bruxelles http://www.mediaxim.com/
Peter Hill a ?crit :
Hello,
I am encoding from an mpeg ts video device to dv format: ffmpeg -i /dev/mydevice -vcodec dvvideo out.dv
however, I get glitches in the output video, and errors on the command line like: [mpeg2video @ 0x84d1cc8]00 motion_type at 7 33 [mpeg2video @ 0x84d1cc8]invalid cbp at 1 34 [mpeg2video @ 0x84d1cc8]ac-tex damaged at 0 35 [mpeg2video @ 0x84d1cc8]Warning MVs not available [mpeg2video @ 0x84d1cc8]concealing 675 DC, 675 AC, 675 MV errors
The glitches are in the input
If I do: cat /dev/mydevice > myfile.ts then: ffmpeg -i myfile.ts -vcodec dvvideo out2.dv
all is well.
Looks like the device returns incomplete frames. Thanks for your reply, but I don't think the problem is in the input. My evidence: I can cat to a file from the device, then encode offline with no errors. It is only when trying to encode directly from the device
On 27 Aug 2007, at 17:23, Michel Bardiaux wrote: that I get errors. I can cat to file while simultaneously using ffmpeg 'live'. I can then use ffmpeg on the cat'ed file with no errors.
CPU and memory usage is low (ish ~ 30%), what other limiting factors are there?
Many thanks for your help, Peter
PS. Full cmd line:
ffmpeg -i /dev/mydevice -vcodec dvvideo ~/out.dv FFmpeg version SVN-r10129, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-liba52bin --enable-pp --enable-pthreads -- enable-gpl --disable-strip --extra-cflags=-O2 --extra-cflags=-g -- extra-cflags=-pipe --extra-cflags=-Wall --extra-cflags=-Wp,- D_FORTIFY_SOURCE=2 --extra-cflags=-fexceptions --extra-cflags=- fstack- protector --extra-cflags=--param=ssp-buffer-size=4 --extra-cflags=- m32 --extra-cflags=-march=i386 --extra-cflags=-mtune=generic --extra- cflags=-fasynchronous-unwind-tables libavutil version: 49.5.0 libavcodec version: 51.41.0 libavformat version: 51.12.2 built on Aug 20 2007 17:53:31, gcc: 4.1.2 20070502 (Red Hat 4.1.2-12) Input #0, mpegts, from '/dev/mydevice': Duration: N/A, bitrate: 8172 kb/s Stream #0.0[0x44](eng): Audio: mp2, 48000 Hz, stereo, 192 kb/s Stream #0.1[0x45]: Video: mpeg2video, yuv420p, 720x576, 7980 kb/s, 25.00 fps(r) Output #0, dv, to '/video/out.dv': Stream #0.0: Video: dvvideo, yuv420p, 720x576, q=2-31, 200 kb/s, 25.00 fps(c) Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1
-- Michel Bardiaux R&D Director T +32 [0] 2 790 29 41 F +32 [0] 2 790 29 02 E mailto:mbardiaux at mediaxim.be
Mediaxim NV/SA Vorstlaan 191 Boulevard du Souverain Brussel 1160 Bruxelles http://www.mediaxim.com/ _______________________________________________ ffmpeg-user mailing list ffmpeg-user at mplayerhq.hu http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-user
Peter Hill a ?crit :
On 27 Aug 2007, at 17:23, Michel Bardiaux wrote:
Peter Hill a ?crit :
Hello,
I am encoding from an mpeg ts video device to dv format: ffmpeg -i /dev/mydevice -vcodec dvvideo out.dv
however, I get glitches in the output video, and errors on the command line like: [mpeg2video @ 0x84d1cc8]00 motion_type at 7 33 [mpeg2video @ 0x84d1cc8]invalid cbp at 1 34 [mpeg2video @ 0x84d1cc8]ac-tex damaged at 0 35 [mpeg2video @ 0x84d1cc8]Warning MVs not available [mpeg2video @ 0x84d1cc8]concealing 675 DC, 675 AC, 675 MV errors The glitches are in the input
If I do: cat /dev/mydevice > myfile.ts then: ffmpeg -i myfile.ts -vcodec dvvideo out2.dv
all is well.
Looks like the device returns incomplete frames. Thanks for your reply, but I don't think the problem is in the input. My evidence:
Mine is above: the messages are prefixed by mpeg2video, ergo they come from the decoder, since the encoder is dvvideo, not mpeg2video.
I can cat to a file from the device, then encode offline with no errors. It is only when trying to encode directly from the device that I get errors.
I did not mean the TS device dropped the remainder of the frames, only that *one* read call did not give a complete frame to the application, the next read would return the rest. When you cat, the application *does* loop on read, thereby reassembling the frames.
I can cat to file while simultaneously using ffmpeg 'live'.
Exactly what you do in that experiment is unclear. PS: dont expect a reply, going home now.
I can then use ffmpeg on the cat'ed file with no errors.
CPU and memory usage is low (ish ~ 30%), what other limiting factors are there?
Many thanks for your help, Peter
PS. Full cmd line:
ffmpeg -i /dev/mydevice -vcodec dvvideo ~/out.dv FFmpeg version SVN-r10129, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --enable-liba52bin --enable-pp --enable-pthreads -- enable-gpl --disable-strip --extra-cflags=-O2 --extra-cflags=-g -- extra-cflags=-pipe --extra-cflags=-Wall --extra-cflags=-Wp,- D_FORTIFY_SOURCE=2 --extra-cflags=-fexceptions --extra-cflags=- fstack- protector --extra-cflags=--param=ssp-buffer-size=4 --extra-cflags=- m32 --extra-cflags=-march=i386 --extra-cflags=-mtune=generic --extra- cflags=-fasynchronous-unwind-tables libavutil version: 49.5.0 libavcodec version: 51.41.0 libavformat version: 51.12.2 built on Aug 20 2007 17:53:31, gcc: 4.1.2 20070502 (Red Hat 4.1.2-12) Input #0, mpegts, from '/dev/mydevice': Duration: N/A, bitrate: 8172 kb/s Stream #0.0[0x44](eng): Audio: mp2, 48000 Hz, stereo, 192 kb/s Stream #0.1[0x45]: Video: mpeg2video, yuv420p, 720x576, 7980 kb/s, 25.00 fps(r) Output #0, dv, to '/video/out.dv': Stream #0.0: Video: dvvideo, yuv420p, 720x576, q=2-31, 200 kb/s, 25.00 fps(c) Stream #0.1(eng): Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s Stream mapping: Stream #0.1 -> #0.0 Stream #0.0 -> #0.1
-- Michel Bardiaux R&D Director T +32 [0] 2 790 29 41 F +32 [0] 2 790 29 02 E mailto:mbardiaux at mediaxim.be Mediaxim NV/SA Vorstlaan 191 Boulevard du Souverain Brussel 1160 Bruxelles http://www.mediaxim.com/
participants (2)
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mbardiaux＠mediaxim.be -
pitman.pete＠gmail.com