May 2011 - ffmpeg-user - lists.ffmpeg.org

Asynchronous overlays
by Alexandre Ferrieux 19 May '11

19 May '11

Hello, I'd like to put side-by-side two video sources (with the overlay filter), with a completely asynchronous/decoupled scheme. Indeed my two video sources have varied and unstable frame rates, and in a naive setup of the overlay filter, ffmpeg insists on fetching a frame from each one for every output frame. The idea is do decode both streams independently (threads) into the same overlay buffer, and have a third thread sample this at a regular rate (the wanted output frame rate), and feed that into the output chain (encoder + container). So, if at any given time one of the sources lags, the same frozen frame from it will be reused in several output frames (ie overlay buffer not updated in that area), but the overall output will not be stalled (as it is today). Q1: is this doable with command-line flags to the ffmpeg executable ? Q2: if not, I'd appreciate a sketch of where to look in the sources to do this in C. -Alex

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how to maximize the volume without distorting the sound using ffmpeg?
by littlebat 19 May '11

19 May '11

Hi, Is there a way to maximize the volume without distorting the sound using Ffmpeg? just like the "-af volnorm" filter in Mencoder? littlebat

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libavcodec.so crashed under arm v7
by Aoxiang Xu 18 May '11

18 May '11

Hi: We have an application that uses libavcodec to play mpeg4 video. It works on arm v5. Now, I recompiled it under arm v7. The application crashed. I traced the problem to the line of MPV_common_init() in function ff_h263_decode_frame() of h263dec.c. After some investigations, i realized that MPV_common_init_arm() that is called in ff_dct_common_init() is arm version dependent. I would like to know if libavcodec is ready to work on arm v7. Thank you very much, Cheers,

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av_interleaved_write_frame(): Invalid argument
by Jon Drukman 18 May '11

18 May '11

I've noticed this happening a lot with wmv files. Is there anything I can do to fix it? /usr/local/bin/ffmpeg -loglevel quiet -v 0 -i /tmp/videoproc-24481/video_00006.wmv -s 480x352 -an -pass 1 -vcodec libx264 -vpre fast_firstpass -b 300k -bt 300k -threads 0 /tmp/videoproc-24481/video_00006.wmv.mp4 ffmpeg version git-N-29818-gb7c7f89, Copyright (c) 2000-2011 the FFmpeg developers built on May 11 2011 15:23:54 with gcc 4.1.2 20080704 (Red Hat 4.1.2-48) configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libx264 --enable-pthreads --enable-static --disable-shared --disable-network --enable-nonfree --extra-ldflags=-static libavutil 51. 2. 1 / 51. 2. 1 libavcodec 53. 5. 0 / 53. 5. 0 libavformat 53. 0. 3 / 53. 0. 3 libavdevice 53. 0. 0 / 53. 0. 0 libavfilter 2. 5. 0 / 2. 5. 0 libswscale 0. 14. 0 / 0. 14. 0 Stream mapping: Stream #0.1 -> #0.0 Press [q] to stop encoding av_interleaved_write_frame(): Invalid argument

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Re: [FFmpeg-user] Convert some hundreds files to a H264
by Mailing List 18 May '11

18 May '11

marcos rebelo <oleber(a)gmail.com> wrote in news:BANLkTi=43-RGdG9h4LPx+mi2AcxdZyv-zQ@mail.gmail.com: > I was giving some hundreds of files (more will come) with > different formats (div, avi, mov, ...) and different sizes to be > converted to H264 with: > a maximum width 720, > -b 500k > -bt 500k > -acodec libfaac As others have suggested, using a simple loop to process the files is not particularly difficult. The only issue is your "maximum width 720". Using -vf "scale=720:-1" is unreliable because it throws errors for odd-numbered heights, instead of rounding to a usable value as mencoder can. You could parse the output of either "ffprobe" or "ffmpeg -i" for the display aspect ratio and use it to calculate scaling dimensions, but it makes the script considerably more complex. My own crude solution is in Windows batch, which wouldn't help you with Perl.

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colorspace not supported in jpeg
by rch3＠sfu.ca 18 May '11

18 May '11

Hi, I am starting out using ffmpeg and I am trying to turn an AVFrame into a jpg image. I have used some code I found to try doing this, but it sends me the error: "[mjpeg @ 0x8a36ab0]colorspace not supported in jpeg" It is generated by the code below I think from mpeg video_enc.c in the libavcodec directory case CODEC_ID_MJPEG: if(avctx->pix_fmt != PIX_FMT_YUVJ420P && avctx->pix_fmt != PIX_FMT_YUVJ422P && ((avctx->pix_fmt != PIX_FMT_YUV420P && avctx->pix_fmt != PIX_FMT_YUV422P) || avctx->strict_std_compliance>FF_COMPLIANCE_UNOFFICIAL)){ av_log(avctx, AV_LOG_ERROR, "colorspace not supported in jpeg\n"); return -1; } I have tried to look into this, and have discovered that the error is from changed from PIX_FMT_YUV420P to PIX_FMT_YUV422P with no success. Is there some way to fix this? Further investigation (looping through pixel formats) found that it ONLY compiles with PIX_FMT_YUV410P which is YUV 4:1:0. But the program seg-faults when calling avcodec_encode_video( pOCodecCtx,Buffer,BufSiz,pFrame ); Any ideas? Thanks, C. (below is the code I am trying) http://permalink.gmane.org/gmane.comp.video.ffmpeg.libav.user/5127 int WriteJPEG (AVCodecContext *pCodecCtx, AVFrame *pFrame, int FrameNo){ AVCodecContext *pOCodecCtx; AVCodec *pOCodec; uint8_t *Buffer; int BufSiz; int BufSizActual; int ImgFmt = PIX_FMT_YUV420P; //for the newer ffmpeg version, this int to pixelformat FILE *JPEGFile; char JPEGFName[256]; BufSiz = avpicture_get_size ( ImgFmt,pCodecCtx->width,pCodecCtx->height ); Buffer = (uint8_t *)malloc ( BufSiz ); if ( Buffer == NULL ) return ( 0 ); memset ( Buffer, 0, BufSiz ); pOCodecCtx = avcodec_alloc_context ( ); if ( !pOCodecCtx ) { free ( Buffer ); return ( 0 ); } pOCodecCtx->bit_rate = pCodecCtx->bit_rate; pOCodecCtx->width = pCodecCtx->width; pOCodecCtx->height = pCodecCtx->height; pOCodecCtx->pix_fmt = ImgFmt; pOCodecCtx->codec_id = CODEC_ID_MJPEG; pOCodecCtx->codec_type = CODEC_TYPE_VIDEO; pOCodecCtx->time_base.num = pCodecCtx->time_base.num; pOCodecCtx->time_base.den = pCodecCtx->time_base.den; pOCodec = avcodec_find_encoder ( pOCodecCtx->codec_id ); if ( !pOCodec ) { free ( Buffer ); return ( 0 ); } if ( avcodec_open ( pOCodecCtx, pOCodec ) < 0 ) { free ( Buffer ); printf("Could not open codec\n"); return ( 0 ); } pOCodecCtx->mb_lmin = pOCodecCtx->lmin = pOCodecCtx->qmin * FF_QP2LAMBDA; pOCodecCtx->mb_lmax = pOCodecCtx->lmax = pOCodecCtx->qmax * FF_QP2LAMBDA; pOCodecCtx->flags = CODEC_FLAG_QSCALE; pOCodecCtx->global_quality = pOCodecCtx->qmin * FF_QP2LAMBDA; pFrame->pts = 1; pFrame->quality = pOCodecCtx->global_quality; printf("hERE3\n"); BufSizActual = avcodec_encode_video( pOCodecCtx,Buffer,BufSiz,pFrame ); printf("hERE4\n"); sprintf ( JPEGFName, "%06d.jpg", FrameNo ); JPEGFile = fopen ( JPEGFName, "wb" ); fwrite ( Buffer, 1, BufSizActual, JPEGFile ); fclose ( JPEGFile ); avcodec_close ( pOCodecCtx ); free ( Buffer ); return ( BufSizActual ); } Thank you, C

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-g command
by JULIAN GARDNER 18 May '11

18 May '11

Has anything changed in relation to this command and the new svn code. I ask this as i have a an encoder now running latest svn code and it takes 10 seconds to get the first frame, on my other encoders its within 3 seconds. all encoders use "-g 75" joolz

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converting a previous cuted file, Invalid pixel format string '-1'
by Enrico Kern 18 May '11

18 May '11

Hi all, maybe someone can help me with this issue. I use the latest ffmpeg from trunk from today but i guess older ones are affected too. - I have a FLV file which contains H264 video and mp3 audio, the file is recorded by WowzaMediaServer - I cut this file with ffmpeg in multiple parts with ffmpeg -i $input -ss $time -t $time $output.flv That works fine, the file also plays in flash and players. Now however i want to transcode this cuted file to another format, that doesnt work. ffmpeg returns with this: ffmpeg -i cuterror.flv -y test.webm FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers built on May 17 2011 07:24:46 with gcc 4.1.2 20080704 (Red Hat 4.1.2-50) configuration: --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --disable-ffplay --enable-shared --enable-gpl --enable-postproc --enable-nonfree --enable-avfilter --enable-pthreads --extra-cflags=-fPIC libavutil 50.36. 0 / 50.36. 0 libavcore 0.16. 1 / 0.16. 1 libavcodec 52.108. 0 / 52.108. 0 libavformat 52.93. 0 / 52.93. 0 libavdevice 52. 2. 3 / 52. 2. 3 libavfilter 1.74. 0 / 1.74. 0 libswscale 0.12. 0 / 0.12. 0 libpostproc 51. 2. 0 / 51. 2. 0 [flv @ 0x1e698510] max_analyze_duration reached [flv @ 0x1e698510] Estimating duration from bitrate, this may be inaccurate Input #0, flv, from 'cuterror.flv': Metadata: duration : 573 width : 1152 height : 720 videodatarate : 200 framerate : 1000 videocodecid : 7 audiodatarate : 100 audiosamplerate : 44100 audiosamplesize : 16 stereo : false audiocodecid : 2 encoder : Lavf52.84.0 filesize : 37793482 Duration: 00:09:32.92, start: 0.002000, bitrate: 307 kb/s Stream #0.0: Video: h264, 204 kb/s, 1k tbr, 1k tbn, 1k tbc Stream #0.1: Audio: mp3, 44100 Hz, 1 channels, s16, 102 kb/s [buffer @ 0x1e6abc30] Invalid pixel format string '-1' Error opening filters! I can of course write the file to this format when i cut them, but thats not possible in our production environment, as we need the flash files for our website players. I need the ability to convert them later to webm for html5 integration. But it doesnt matter if i use webm or any other codec/container, the error stays the same even if i just want todo a copy of the streams. Anyone got a idea of whats wrong here? A cutted demonstration file can be downloaded here: http://master.inacdn.com/cuterror.flv (36MB) Regards, Enrico -- [Clavain Technologies Ltd.] Enrico Kern, Managing Director kern(a)clavain.co.uk www.clavain.co.uk Herdernstr. 16 8004 Zurich SWITZERLAND TEL: +41 (44) 586 55 84 FAX: +49 (180) 5233633-54820 Registered in 1A Pope Street, SE1 3PR London UK, Company No. 07245410

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How to rip DVD movies and convert DVD to AVI, DivX, MKV, MP4, WMV
by ruby2010 18 May '11

18 May '11

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error when compiling ffmpeg
by Kumar Sricharan 18 May '11

18 May '11

Hello, When trying to install ffmpeg, I get the error "ERROR: libx264 not found". I am attaching the config.log file. Please let me know how to resolve this problem. Thanks, Kumar

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