January 2011 - ffmpeg-user - lists.ffmpeg.org

merging to mpeg_files
by betonpfeiler＠googlemail.com 03 Jan '11

03 Jan '11

Hello everyone! I'm trying to encode two videoclips into one outputfile. I tried: cat orig1.mpg orig2.mpg | ffmpeg -f mpeg -i - -vcodec copy -acodec copy merged.mpg but it didn't work for me. Is there another way? Do the original files have to have the same specs (bitrate, codec?)? I also thought about encoding the two files seperatly and then just mux them together, is that possible? Didn't find anything on the FFMPEG documentation... Thanks!!

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rebuilding (cat'ing) Apple http streaming videos
by ffmpeg＠lakedaemon.net 02 Jan '11

02 Jan '11

All, I'm trying to view the videos from 27c3 [1] and am having a bit of a problem. I don't have an iPhone. :-) What I have is the .m3u8 playlist for a given talk, that, in turn, lists all of the 5 second long segments associated with it. Each file is an mpeg-ts container with h264 video and aac audio. ffprobe output below. I've tried converting each file to mpeg-ps, then cat'ing them together as the ffmpeg manual suggests, but the audio loses sync, and every five seconds, the video goes grey (with motion deviations) until the next keyframe (right word?). Nothing on linux seems to be able to view this properly. I've looked at [2], but each file has a different runtime, 5 seconds +/- a full second. Doing each by hand for each hour long presentation would be painful. Any ideas on how to stitch this back together? thx, Jason. [1] http://27c3.iphoneblog.de/recordings.html [2] http://ffmpeg-users.933282.n4.nabble.com/Repost-MP4-Audio-Video-Length-Issu… ### ffprobe sample.ts ############################################## FFprobe version SVN-r20090707, Copyright (c) 2007-2009 Stefano Sabatini libavutil 49.15. 0 / 49.15. 0 libavcodec 52.20. 0 / 52.20. 1 libavformat 52.31. 0 / 52.31. 0 built on Jan 19 2010 21:59:04, gcc: 4.4.3 20100116 (prerelease) [NULL @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced [h264 @ 0x98fed70]B picture before any references, skipping [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! [h264 @ 0x98fed70]non-existing PPS referenced Last message repeated 1 times [h264 @ 0x98fed70]decode_slice_header error [h264 @ 0x98fed70]no frame! Input #0, mpegts, from 'sample.ts': Duration: 00:00:05.31, start: 2983.120833, bitrate: 1301 kb/s Program 1 Service01 Stream #0.0[0x100]: Video: h264, yuv420p, 768x432 [PAR 1:1 DAR 16:9], 25 tbr, 90k tbn, 50 tbc Stream #0.1[0x101]: Audio: aac, 22050 Hz, mono, s16, 42 kb/s ######################################################################

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How to save file as .avi from a live feed from a IP camera
by hansraj136＠gmail.com 02 Jan '11

02 Jan '11

Hello, I am a newbie in this field and wanted to how to save video stream from an IP camera (Linksys WVC54GCA) to an .avi file. I have read a few things in the net but that doesn't quite seem to be working for me. Thanks in advance.

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