April 2015 - ffmpeg-user - lists.ffmpeg.org

Howto compile ffplay.c in seperate directory with my own svn-version of ffmpeg
by tps＠netmaster.dk 23 Feb '16

23 Feb '16

Dear All I have compiled svn-version of ffmpeg. I only do configure and make. I do not do make install because I don't want this svn-version of ffmpeg to overwrite the 'official' Ubuntu version of ffpeg that is also on the host. Now I want to compile my own version of ffplay.c so I create a directory ffplay at the same level as the svn ffmpeg-directory. I copy ffplay.c from ffmpeg to ffplay. Now what gcc options should I use to compile ffplay.c? I tried with this but got tons of errors: gcc -o ffplay ffplay.c -I../ffmpeg -L../ffmpeg/libavcodec -L../ffmpeg/libavformt -L../ffmpeg/libswscale -L../ffmpeg/libavutil -lavcodec -lavformat -lswscale -lavutil -lmp3lame -lx264 `sdl-config --cflags --libs` I note that when I do the make in the svn ffmpeg-directory there are a lot of options on the gcc command. I hardly know any of the options. Thanks in advance

5 5

RTMP output - "Past duration too large"
by Matt Conway 26 Jan '16

26 Jan '16

I'm trying to use ffmpeg to livestream to an online service such as ustream. This is the command I am using - ffmpeg -i rtsp://RTSPStreamUrl -an -f avi rtmp://RTMPStreamUrl It keeps returning a long list of errors all saying "Past duration X.XXXXXX too large", the number is changing however, increasing the longer I leave the stream running. Is this because the frames in my stream are too large? What can I do to stop this from happening. Here is a screenshot of the output. [image: Inline image 1]

4 8

Capture Webcam and also display on screen.
by kevin 13 Jan '16

13 Jan '16

I need to capture webcam and also save that file/stream simultaneously in OS X. This command is available, ffmpeg -f avfoundation -i "<screen device index>:<audio device index>" out.avi but how to display on screen the video stream that is getting captured to out.avi? Thank you.

2 1

a -vf for broadcast safe
by Jim Shupert 30 Dec '15

30 Dec '15

I was wondering if there is a means to ensure that a file is transcoded as 'broadcast safe' input a unCompressed yuv avi and get a second Uncompressed yuv avi or mov and it would be 'broadcast safe'. I wish for the functionality of the broadcast safe effect available withing final cut 6. I do not find anything in the documentation. I wonder if Hald CLUT would be of any utility. thanks jim s

7 16

DTS Out of Order / DTS & PTS Invalid Dropping
by ryan.vincent29＠gmail.com 11 Aug '15

11 Aug '15

Hello FFmpeg-users, I am struggling to get the concat demuxer working on FFMPEG Version 4.2.4. I am attempting to combine multiple image files into a video by using the command: ffmpeg -f concat -i myFile.txt output.mp4 I get an output file from the command, but the total time is much shorter than the time I specify in the file. I am fairly sure it has something to do with these: [concat @ 0x3517c20] DTS -230575710986727 < -9214782102262 out of order DTS -221360928884465, next:40000 st:0 invalid dropping PTS -221360928884465, next:40000 invalid dropping st:0 DTS -221360928884389, next:80000 st:0 invalid dropping PTS -221360928884389, next:80000 invalid dropping st:0 *Does anyone have any idea what I can do to get this working? Contents of myFile.txt: file 'image0.png' duration 2.018 file 'image1.png' duration 3.018 file 'image2.png' duration 4.018 Version Information for FFMPEG: ffmpeg version 2.4.2 Copyright (c) 2000-2014 the FFmpeg developers built on Oct 10 2014 15:15:58 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 / 56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 / 53. 0.100 Output from ffmpeg upon running the command: ffmpeg version 2.4.2 Copyright (c) 2000-2014 the FFmpeg developers built on Oct 10 2014 15:15:58 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 / 56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 / 53. 0.100 Input #0, concat, from 'myFile.txt': Duration: 00:00:09.05, start: 775903366.480000, bitrate: 0 kb/s Stream #0:0: Video: png, rgba, 1500x1000, 25 tbr, 25 tbn, 25 tbc No pixel format specified, yuv444p for H.264 encoding chosen. Use -pix_fmt yuv420p for compatibility with outdated media players. [libx264 @ 0x35240e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX [libx264 @ 0x35240e0] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit [libx264 @ 0x35240e0] 264 - core 142 r2431 ac76440 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'output.mp4': Metadata: encoder : Lavf56.4.101 Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 1500x1000, q=-1--1, 25 fps, 12800 tbn, 25 tbc Metadata: encoder : Lavc56.1.100 libx264 Stream mapping: Stream #0:0 -> #0:0 (png (native) -> h264 (libx264)) Press [q] to stop, [?] for help [concat @ 0x3517c20] DTS -230575710986727 < -9214782102262 out of order DTS -221360928884465, next:40000 st:0 invalid dropping PTS -221360928884465, next:40000 invalid dropping st:0 DTS -221360928884389, next:80000 st:0 invalid dropping PTS -221360928884389, next:80000 invalid dropping st:0 frame= 3 fps=0.0 q=28.0 Lsize= 27kB time=00:00:00.04 bitrate=5587.6kbits/s video:26kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.225568% [libx264 @ 0x35240e0] frame I:1 Avg QP:14.32 size: 13024 [libx264 @ 0x35240e0] frame P:1 Avg QP:16.34 size: 246 [libx264 @ 0x35240e0] frame B:1 Avg QP:18.24 size: 13107 [libx264 @ 0x35240e0] consecutive B-frames: 33.3% 66.7% 0.0% 0.0% [libx264 @ 0x35240e0] mb I I16..4: 73.4% 19.5% 7.1% [libx264 @ 0x35240e0] mb P I16..4: 0.1% 0.1% 0.0% P16..4: 1.7% 0.1% 0.0% 0.0% 0.0% skip:98.0% [libx264 @ 0x35240e0] mb B I16..4: 9.5% 6.3% 6.8% B16..8: 4.8% 0.5% 0.0% direct: 0.1% skip:72.0% L0:20.7% L1:79.0% BI: 0.3% [libx264 @ 0x35240e0] 8x8 transform intra:21.1% inter:70.4% [libx264 @ 0x35240e0] coded y,u,v intra: 10.0% 5.9% 3.9% inter: 0.5% 0.5% 0.5% [libx264 @ 0x35240e0] i16 v,h,dc,p: 86% 12% 1% 1% [libx264 @ 0x35240e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 12% 55% 1% 1% 1% 1% 1% 1% [libx264 @ 0x35240e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 41% 27% 10% 3% 4% 4% 4% 3% 3% [libx264 @ 0x35240e0] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0x35240e0] kb/s:1758.47 Any help would be much appreciated. Ryan Vincent -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/DTS-Out-of-Order-DTS-PTS-Invalid-D… Sent from the FFmpeg-users mailing list archive at Nabble.com.

4 4

Is it possible to speed up merging-speed from HD to LAN?
by Christoph Gerstbauer 09 Jul '15

09 Jul '15

Hello I am working with ffmpeg over LAN. I want to MERGE 2 files. 1 AVI with huffyuv and 1 WAV with pcm_s24le to one file (AVI) with a video and a audio stream. If I do this from HardDisk to LANshare it takes more time than a simple filecopy of both files to the same target. 1GBIT LAN: Filecopy: 80 percent LAN speed Merging: 25 percent LAN speed https://cerebrum.noa-audio.com/noacloud/public.php?service=files&t=7b6808d2… On the left side you can see the filecopy- and on the right side the merging-lanload. Is it possible to speed the merging up in any way? Does the ffmpeg merger has an internal bottleneck (?) command line: ffmpeg -i inputfile.avi -i inputfile.wav -acodec copy -vcodec copy -map 0:0 -map 1:0 \\lanshare\folder\targetfile.avi Best Regards Christoph

3 10

Capture 1080 50i from decklink
by Maxim Kozlov 25 Jun '15

25 Jun '15

Hi. Is it possible to capture full hd 1920x1080 50i source? -list_formats allows only 25 fps $ ffmpeg -f decklink -list_formats 1 -i 'DeckLink SDI (1)' ffmpeg version 2.6.git Copyright (c) 2000-2015 the FFmpeg developers built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) configuration: --disable-shared --enable-static --enable-gpl --enable-nonfree --enable-fontconfig --enable-libfaac --enable-libfreetype --enable-libmp3lame --enable-librtmp --enable-libvo-aacenc --enable-libx264 --enable-decklink --enable-version3 --enable-ffplay --disable-doc --disable-ffserver --enable-pthreads --enable-filters --enable-libvorbis --enable-libtheora --enable-runtime-cpudetect --enable-libass --enable-libzmq --enable-bzlib --enable-zlib --extra-cflags=-I/misc/encoder/ffmpeg_ubuntu/ffmpeg_src/BlackmagicDeckLinkSDK10_3_1/Linux/include --prefix=/misc/encoder/ffmpeg_ubuntu/compiled14/ --extra-libs='-ldl -fPIC' libavutil 54. 20.100 / 54. 20.100 libavcodec 56. 28.100 / 56. 28.100 libavformat 56. 25.101 / 56. 25.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 12.100 / 5. 12.100 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 [decklink @ 0x1c643a0] Supported formats for 'DeckLink SDI (1)': [decklink @ 0x1c643a0] 1 720x486 at 30000/1001 fps (interlaced, lower field first) [decklink @ 0x1c643a0] 2 720x486 at 24000/1001 fps [decklink @ 0x1c643a0] 3 720x576 at 25000/1000 fps (interlaced, upper field first) [decklink @ 0x1c643a0] 4 1920x1080 at 24000/1001 fps [decklink @ 0x1c643a0] 5 1920x1080 at 24000/1000 fps [decklink @ 0x1c643a0] 6 1920x1080 at 25000/1000 fps [decklink @ 0x1c643a0] 7 1920x1080 at 30000/1001 fps [decklink @ 0x1c643a0] 8 1920x1080 at 30000/1000 fps [decklink @ 0x1c643a0] 9 1920x1080 at 25000/1000 fps (interlaced, upper field first) [decklink @ 0x1c643a0] 10 1920x1080 at 30000/1001 fps (interlaced, upper field first) [decklink @ 0x1c643a0] 11 1920x1080 at 30000/1000 fps (interlaced, upper field first) [decklink @ 0x1c643a0] 12 1280x720 at 50000/1000 fps [decklink @ 0x1c643a0] 13 1280x720 at 60000/1001 fps [decklink @ 0x1c643a0] 14 1280x720 at 60000/1000 fps DeckLink SDI (1): Immediate exit requested

3 5

timestamp calculation
by Chau Pham 24 Jun '15

24 Jun '15

Hi Everybody, Suppose that I know AVPacket element: pts, dts, duration How could I calculate the timestamp (hh:mm:ss:MMM)? Thank You,Chau Pham.

5 7

FFmpeg hangs very often
by LD2K.com Litecoin Mining Pool 19 Jun '15

19 Jun '15

FFmpeg hangs very often, even if i trying output to a local file output.flv ffmpeg/ffmpeg -i http://21.12.32.23:8042/9275617894-ru-perviy-hd -preset fast -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 96k -vcodec libx264 -b:v 1900k -maxrate 2000k -bufsize 4000k -g 60 -f flv rtmp://wowza/live/11111 ffmpeg version 2.4.2- http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2014 the FFmpeg developers built on Oct 9 2014 07:24:56 with gcc 4.8 (Debian 4.8.3-11) configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8 libavutil 54. 7.100 / 54. 7.100 libavcodec 56. 1.100 / 56. 1.100 libavformat 56. 4.101 / 56. 4.101 libavdevice 56. 0.100 / 56. 0.100 libavfilter 5. 1.100 / 5. 1.100 libswscale 3. 0.100 / 3. 0.100 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 0.100 / 53. 0.100 [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! [h264 @ 0x2d9fba0] non-existing PPS 0 referenced Last message repeated 1 times [h264 @ 0x2d9fba0] decode_slice_header error [h264 @ 0x2d9fba0] no frame! Input #0, mpegts, from ' http://21.12.32.23:8042/9275617894-ru-perviy-hd': Duration: N/A, start: 66740.830422, bitrate: 132 kb/s Program 1 Stream #0:0[0x4a](rus): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 132 kb/s Stream #0:1[0x4b]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc [libx264 @ 0x2dcace0] using SAR=1/1 [libx264 @ 0x2dcace0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64 [libx264 @ 0x2dcace0] profile High, level 4.0 [libx264 @ 0x2dcace0] 264 - core 142 r50 dd79a61 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=60 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=abr mbtree=1 bitrate=1900 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=2000 vbv_bufsize=4000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00 Output #0, flv, to 'rtmp://wowza/live/11111': Metadata: encoder : Lavf56.4.101 Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 1900 kb/s, 25 fps, 1k tbn, 25 tbc Metadata: encoder : Lavc56.1.100 libx264 Stream #0:1(rus): Audio: aac ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 96 kb/s Metadata: encoder : Lavc56.1.100 aac Stream mapping: Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264)) Stream #0:0 -> #0:1 (aac (native) -> aac (native)) Press [q] to stop, [?] for help [mpegts @ 0x2d99aa0] PES packet size mismatchme=00:00:10.66 bitrate=1485.6kbits/s [aac @ 0x2dab320] TYPE_FIL: Input buffer exhausted before END element found Error while decoding stream #0:0: Invalid data found when processing input [mpegts @ 0x2d99aa0] PES packet size mismatch [aac @ 0x2dab320] Number of bands (29) exceeds limit (28). Error while decoding stream #0:0: Invalid data found when processing input [h264 @ 0x3659420] corrupted macroblock 64 38 (total_coeff=16)trate=1491.3kbits/s [h264 @ 0x3659420] error while decoding MB 64 38 [h264 @ 0x3659420] concealing 3585 DC, 3585 AC, 3585 MV errors in I frame [mpegts @ 0x2d99aa0] PES packet size mismatchme=00:00:30.53 bitrate=1780.3kbits/s [h264 @ 0x3531500] Cannot use next picture in error concealment [h264 @ 0x3531500] concealing 3314 DC, 3314 AC, 3314 MV errors in P frame [flv @ 0x2dcd060] Failed to update header with correct duration.ate=1789.2kbits/s [flv @ 0x2dcd060] Failed to update header with correct filesize. frame= 757 fps= 14 q=-1.0 Lsize= 7141kB time=00:00:30.70 bitrate=1905.4kbits/s video:6743kB audio:360kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.522933% [libx264 @ 0x2dcace0] frame I:18 Avg QP:27.18 size: 68232 [libx264 @ 0x2dcace0] frame P:413 Avg QP:30.18 size: 10996 [libx264 @ 0x2dcace0] frame B:326 Avg QP:30.78 size: 3482 [libx264 @ 0x2dcace0] consecutive B-frames: 34.3% 19.6% 15.5% 30.6% [libx264 @ 0x2dcace0] mb I I16..4: 33.4% 53.8% 12.8% [libx264 @ 0x2dcace0] mb P I16..4: 4.6% 5.8% 0.1% P16..4: 33.3% 2.7% 1.6% 0.0% 0.0% skip:51.8% [libx264 @ 0x2dcace0] mb B I16..4: 1.0% 0.4% 0.0% B16..8: 14.3% 0.7% 0.0% direct: 8.3% skip:75.3% L0:47.0% L1:51.2% BI: 1.8% [libx264 @ 0x2dcace0] 8x8 transform intra:53.1% inter:83.3% [libx264 @ 0x2dcace0] coded y,uvDC,uvAC intra: 19.8% 55.0% 7.8% inter: 4.0% 15.4% 0.1% [libx264 @ 0x2dcace0] i16 v,h,dc,p: 46% 35% 9% 9% [libx264 @ 0x2dcace0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 14% 57% 2% 2% 2% 2% 2% 2% [libx264 @ 0x2dcace0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 25% 11% 5% 6% 6% 6% 6% 6% [libx264 @ 0x2dcace0] i8c dc,h,v,p: 47% 23% 27% 4% [libx264 @ 0x2dcace0] Weighted P-Frames: Y:1.5% UV:1.5% [libx264 @ 0x2dcace0] ref P L0: 76.9% 23.1% [libx264 @ 0x2dcace0] ref B L0: 82.8% 17.2% [libx264 @ 0x2dcace0] ref B L1: 93.8% 6.2% [libx264 @ 0x2dcace0] kb/s:1819.37

2 1

V4L2 recording results in invalid data & buffer still owned errors.
by Louis Rossmann 09 Jun '15

09 Jun '15

Hi I am using a Magewell XI100DUSB-HDMI capture device to record video from a camera. My end goal is to be able to record two cameras simultaneously, one with embedded audio, both HDMI sources. Here is the command I am using to record one of the cameras *$ ffmpeg -f v4l2 -framerate 60 -s 1920x1080 -i /dev/video1 -f alsa -i pulse -c:v libx264 -crf 0 -preset ultrafast -c:a pcm_s16le outfile3.mkv* Sometimes this works perfectly! Unfortunately, at other times, I get audio without video, with this error. *[video4linux2,v4l2 @ 0xfb3e80] The v4l2 frame is 0 bytes, but 4147200 bytes are expected* */dev/video1: Invalid data found when processing input* *[video4linux2,v4l2 @ 0xfb3e80] Some buffers are still owned by the caller on close.* My current resolution to this problem is to simply re-run the command until it records. Sometimes it will record on the 3rd try,sometimes it will record on the 100th try. This is a huge inconvenience, and if I plan to work with two of these at once in the future, it will only get worse. Here is an example of the command when it works, and an example of it when it does not work, just incase I left anything out in that short output above. *$ ffmpeg -f v4l2 -framerate 60 -s 1920x1080 -i /dev/video1 -f alsa -i pulse -c:v libx264 -crf 0 -preset ultrafast -c:a pcm_s16le outfile3.mkv* *ffmpeg version N-65991-g8c63a0d Copyright (c) 2000-2014 the FFmpeg developers* * built on Sep 4 2014 22:48:40 with gcc 4.8.3 (Gentoo 4.8.3 p1.1, pie-0.5.9)* * configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O3 -pipe' --extra-cflags='-march=native -O3 -pipe' --extra-cxxflags='-march=native -O3 -pipe' --disable-static --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --enable-version3 --enable-indev=v4l2 --enable-outdev=v4l2 --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-hardcoded-tables --enable-iconv --enable-network --disable-openssl --enable-ffplay --enable-vaapi --disable-vdpau --enable-zlib --enable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --enable-libfaac --enable-libtheora --disable-libtwolame --enable-libwavpack --disable-libwebp --enable-libx264 --disable-libx265 --enable-libxvid --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --enable-opengl --enable-libv4l2 --enable-libpulse --enable-x11grab --disable-libflite --enable-frei0r --disable-fontconfig --disable-ladspa --disable-libass --enable-libfreetype --disable-libsoxr --disable-pthreads --disable-libopencore-amrwb --disable-libopencore-amrnb --disable-libfdk-aac --disable-libbluray --disable-libcelt --disable-libgme --disable-libgsm --disable-libmodplug --enable-libopus --disable-libquvi --disable-librtmp --disable-libssh --disable-libschroedinger --enable-libspeex --enable-libvorbis --disable-libvpx --disable-libzvbi --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-neon --disable-vfp --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --disable-mipsfpu --disable-altivec --disable-amd3dnow --disable-amd3dnowext --enable-avx --enable-avx2 --enable-fma3 --enable-fma4 --enable-mmxext --enable-sse3 --enable-ssse3 --enable-sse4 --enable-sse42 --cpu=host --enable-nonfree* * libavutil 54. 7.100 / 54. 7.100* * libavcodec 56. 1.100 / 56. 1.100* * libavformat 56. 3.100 / 56. 3.100* * libavdevice 56. 0.100 / 56. 0.100* * libavfilter 5. 0.103 / 5. 0.103* * libavresample 2. 1. 0 / 2. 1. 0* * libswscale 3. 0.100 / 3. 0.100* * libswresample 1. 1.100 / 1. 1.100* * libpostproc 53. 0.100 / 53. 0.100* *[video4linux2,v4l2 @ 0xfb3e80] The v4l2 frame is 0 bytes, but 4147200 bytes are expected* *Input #0, video4linux2,v4l2, from '/dev/video1':* * Duration: N/A, bitrate: 1990656 kb/s* * Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 1990656 kb/s, 60 fps, 60 tbr, 1000k tbn, 1000k tbc* *[pcm_s16le @ 0xfb5ea0] Warning: not compiled with thread support, using thread emulation* *Guessed Channel Layout for Input Stream #1.0 : stereo* *Input #1, alsa, from 'pulse':* * Duration: N/A, start: 1409951144.268999, bitrate: 1536 kb/s* * Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s* *No pixel format specified, yuv422p for H.264 encoding chosen.* *Use -pix_fmt yuv420p for compatibility with outdated media players.* *[libx264 @ 0xfd29a0] Warning: not compiled with thread support, using thread emulation* *[libx264 @ 0xfd29a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2* *[libx264 @ 0xfd29a0] profile High 4:4:4 Predictive, level 4.2, 4:2:2 8-bit* *[libx264 @ 0xfd29a0] 64 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html <http://www.videolan.org/x264.html> - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=0 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=cqp mbtree=0 qp=0* *[pcm_s16le @ 0xfd38c0] Warning: not compiled with thread support, using thread emulation* *[rawvideo @ 0xfb5040] Warning: not compiled with thread support, using thread emulation* *[pcm_s16le @ 0xfd14e0] Warning: not compiled with thread support, using thread emulation* *Output #0, matroska, to 'outfile3.mkv':* * Metadata:* * encoder : Lavf56.3.100* * Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv422p, 1920x1080, q=-1--1, 60 fps, 1k tbn, 60 tbc* * Metadata:* * encoder : Lavc56.1.100 libx264* * Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s* * Metadata:* * encoder : Lavc56.1.100 pcm_s16le* *Stream mapping:* * Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))* * Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))* *Press [q] to stop, [?] for help* *[video4linux2,v4l2 @ 0xfb3e80] The v4l2 frame is 0 bytes, but 4147200 bytes are expected* */dev/video1: Invalid data found when processing input* *frame= 0 fps=0.0 q=0.0 size= 1kB time=00:00:00.47 bitrate= 12.7kbits/sframe= 0 fps=0.0 q=0.0 size= 1kB time=00:00:00.96 bitrate= 6.3kbits/sframe= 0 fps=0.0 q=0.0 size= 1kB time=00:00:01.47 bitrate= 4.1kbits/sframe= 0 fps=0.0 q=0.0 size= 1kB time=00:00:01.97 bitrate= 3.1kbits/sframe= 0 fps=0.0 q=0.0 Lsize= 391kB time=00:00:02.02 bitrate=1585.6kbits/s * *video:0kB audio:380kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.976411%* *[video4linux2,v4l2 @ 0xfb3e80] Some buffers are still owned by the caller on close.*

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