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

ffmpeg -acodec problem
by Nenad Lukic 09 May '11

09 May '11

Hello, I'm Nenad Lukic, php developer, I recently start dealing with ffmpeg, and I have serious problems with it... So if you are a expert, and I'm just a beginner I will really appreciate your help. Here is the problem: I'm trying to make conversions for html5 videos, converting to mp4, webm, ogg/ogv formats. First I had version 0.6.0 that didn't had webm installed, so I ask operators to update that version, and they did, and after that, none of the conversions didn't work... Then I hire someone, to make that... Then that man delete ffmpeg and install new copy... BUT, in php information page version is 0.6.3, and when I run ffmpeg -version I get 0.7rc-1 version... Here is the real problem now: mp4 and webm are converting okay, because their default codecs are ones used for html5, but with ogg/ogv default audio format is flac, that can't be viewed in browsers. That why I have videos without sound. But, problem is that when I try to use sound codecs -acodec no matter what codec I try to use, it doesn't work. I tried with 10 different audio codecs, and only 3 of them ware creating files, and 0 bytes files. So I can't do conversions, and I don't know why is this... Can someone help me? Tell me what to do, how this can be handled, tell me what is the problem, anything... Thank you! I will really appreciate your help! Best regards, Nenad Lukic

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I Need Some Help
by 铁慕容 09 May '11

09 May '11

Dear Sir or Madam Many thanks for reading this email. I am a new learner of FFMPEG. When I was reading your code recently, come to a confused problem which appears in <dv.c> and line 327. As I consider the pointer "s->idct_put[0]" points to the "dsp.idct_put" which is initialized in <dsputil.c> line 4180. Then I looked through the code found the function "ff_simple_idct_put" (line 4252) and found it appears in <simple_idct.c> line 371 also <simple_idct.h>. Logically, I used it to decode DVCPRO 625i50 file but found the result is not exactly correct. Subsequently I compared the address of "c->idct_put= ff_simple_idct_put" in <dsputil.c> line 4252 and the address in <dv.c> when directly call the "ff_simple_idct_put" in <simple_idct.c>. The interesting thing is they are different functions even though they have the same name. To be more sure, I modified the code "mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];" <dv.c> line 521 into "mb->idct_put = s->idct_put[0]" and print a message in the function "ff_simple_idct_put" of <simple_idct.c> line 371. As you can imagine, the code never go into there. So I wonder, 1. which and how you use the idct method when decoding the DVCPRO 625i50 frame? 2. After the initilization of "dsp.idct_put" where maybe modify it? 3. where can I get the correct "ff_simple_idct_put" method except the <simple_idct.c>, when decoding DVCPRO 625i50? 4. what's the pointer "dsp.idct_put" really point to? Please help me. Kind Wishes Yours Chao.Guo

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Segmentation Faults - avcodec_encode_video Please Help
by Aditya 09 May '11

09 May '11

I am writing a simple C program to accept video input decode it encode it into flv and then save output video file. I have looked at danger's tutorials, output-example.c,api-example.c and such. But i seem to be missing something very essential. And always end up encountering , segmentation faults, ( sometimes buffer under flows or warning max analysis time reached. The below is the program. I would very much appreciate for a clear solution to this problem. I have spend to many days trying to figure this out already. [CODE] #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libswscale/swscale.h> #include <stdio.h> #include <stdlib.h> #include <stdbool.h> static void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame); AVFormatContext *pFormatCtx; static int i, videoStream; AVCodecContext *pCodecCtx; AVCodec *pCodec; AVFrame *pFrame; AVFrame *pFrameRGB; AVPacket packet; static int frameFinished; static int numBytes; static uint8_t *buffer; AVCodec *codec; AVCodecContext *c = NULL; int out_size, size, outbuf_size; uint8_t *outbuf; FILE *f; int init_video_file(char *inputFileName) { // Register all formats and codecs av_register_all(); // Open video file if (av_open_input_file(&pFormatCtx, inputFileName, NULL, 0, NULL) != 0) return -1; // Couldn't open file // Retrieve stream information if (av_find_stream_info(pFormatCtx) < 0) return -1; // Couldn't find stream information // Dump information about file onto standard error dump_format(pFormatCtx, 0, inputFileName, false); // Find the first video stream videoStream = -1; for (i = 0; i < pFormatCtx->nb_streams; i++) if (pFormatCtx->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO) { videoStream = i; break; } if (videoStream == -1) return -1; // Didn't find a video stream return 0; } int init_video_codec() { // Get a pointer to the codec context for the video stream pCodecCtx = pFormatCtx->streams[videoStream]->codec; // Find the decoder for the video stream pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if (pCodec == NULL) return -1; // Codec not found // Open codec if (avcodec_open(pCodecCtx, pCodec) < 0) return -1; // Could not open codec return 0; } int set_frame_data() { // Hack to correct wrong frame rates that seem to be generated by some codecs if (pCodecCtx->time_base.num > 1000 && pCodecCtx->time_base.den == 1) pCodecCtx->time_base.den = 1000; // Allocate video frame pFrame = avcodec_alloc_frame(); // Allocate an AVFrame structure pFrameRGB = avcodec_alloc_frame(); if (pFrameRGB == NULL) return -1; // Determine required buffer size and allocate buffer numBytes = avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height); buffer = malloc(numBytes); // Assign appropriate parts of buffer to image planes in pFrameRGB avpicture_fill((AVPicture *) pFrameRGB, buffer, PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height); return 0; } void process_packet_data(char *outFileName) { // Read frames and save first five frames to disk i = 0; while (av_read_frame(pFormatCtx, &packet) >= 0) { // Is this a packet from the video stream? if (packet.stream_index == videoStream) { // Decode video frame avcodec_decode_video(pCodecCtx, pFrame, &frameFinished, packet.data, packet.size); // Did we get a video frame? if (frameFinished) { //printf("\n packet size= %d \t pframe number=n%d ", packet.size, // pFrame->coded_picture_number); // Insane segmentation faults when encoding the got frame.. !!Help. //out_size = avcodec_encode_video(c, outbuf, outbuf_size, pFrame); save_frame_as_image(); } } // Free the packet that was allocated by av_read_frame av_free_packet(&packet); } } void set_encoder_for_output(const char *filename) { uint8_t *outbuf; printf("Video encoding\n"); /* find the mpeg1 video encoder */ codec = avcodec_find_encoder(CODEC_ID_FLASHSV); if (!codec) { fprintf(stderr, "codec not found\n"); exit(1); } c = avcodec_alloc_context(); pFrame = avcodec_alloc_frame(); /* put sample parameters */ c->bit_rate = 128000; /* resolution must be a multiple of two */ c->width = 320; c->height = 240; /* frames per second */ c->time_base = (AVRational) {1,25}; c->gop_size = 10; /* emit one intra frame every ten frames */ c->max_b_frames=1; c->pix_fmt = PIX_FMT_YUV420P; /* open it */ if (avcodec_open(c, codec) < 0) { fprintf(stderr, "could not open codec\n"); exit(1); } f = fopen(filename, "wb"); if (!f) { fprintf(stderr, "could not open ______::: %s\n", filename); exit(1); } /* alloc image and output buffer */ outbuf_size = 230400; outbuf = malloc(outbuf_size); size = c->width * c->height; //out_size = avcodec_encode_video(c, outbuf, outbuf_size, picture); } void cleanup() { // Free the RGB image' free(outbuf); avcodec_close(c); av_free(c); printf("\n"); free(buffer); av_free(pFrameRGB); // Free the YUV frame av_free(pFrame); // Close the codec avcodec_close(pCodecCtx); // Close the video file av_close_input_file(pFormatCtx); } void encode_frames_to_video() { } void save_frame_as_image() { static struct SwsContext *img_convert_ctx; // Convert the image into YUV format that SDL uses if (img_convert_ctx == NULL) { int w = pCodecCtx->width; int h = pCodecCtx->height; img_convert_ctx = sws_getContext(w, h, pCodecCtx->pix_fmt, w, h, PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL); if (img_convert_ctx == NULL) { fprintf(stderr, "Cannot initialize the conversion context!\n"); exit(1); } } int ret = sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize); // Save the frame to disk if (i++ <= 5) SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, i); } int main(int argc, char * argv[]) { init_video_file(argv[1]); init_video_codec(); set_frame_data(); set_encoder_for_output(argv[2]); process_packet_data(argv[2]); cleanup(); return 0; } static void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) { FILE *pFile; char szFilename[32]; int y; // Open file sprintf(szFilename, "frame%d.ppm", iFrame); pFile = fopen(szFilename, "wb"); if (pFile == NULL) return; // Write header fprintf(pFile, "P6\n%d %d\n255\n", width, height); // Write pixel data for (y = 0; y < height; y++) fwrite(pFrame->data[0] + y * pFrame->linesize[0], 1, width * 3, pFile); // Close file fclose(pFile); } [/CODE] [b] Kindly help in resolving the segmentation faults in the above program [/b] I have been unable to find any straight forward example on how to do this. Thanks

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ffmpeg and multichannel USB grabber
by tovis 09 May '11

09 May '11

Dir List! I have using a cheap, multichannel USB grabber dongle, with EasyCAP DC60 Driver from sourceforge net http://sourceforge.net/projects/easycapdc60/ It's have 6 video inputs (listed by v4l-info) named "CVBS0", "CVBS1" ... "CVBS4" and "S-VIDEO". Now I have use command for grabbing: ffmpeg -s 640x480 -f video4linux2 -i /dev/video0 http://localhost:8090/feed1.ffm It's working well, camera is pluged in to input wire number "1". QUESTIONS: - I can not found what syntax to use if I want to use input 2,3 or 4? - I have trying to put timestamp, on to stream, adding "-timestamp now" switch at command line, but I have nothing :( What is the right syntax? Could some one give me an example? Any help would be highly appreciated! Sincerely tovis

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Error on 2-pass x264: timebase mismatch with 1st pass (50/2997 vs 1001/30000)
by sean darcy 09 May '11

09 May '11

Pass 1 works. Pass 2 dies with timebase mismatch: ffmpeg -i play.dv -an -pass 1 -vf yadif=1:0,hqdn3d -vcodec libx264 -preset slower -tune film -r 59.94 -b 4000k -threads 0 -f null -y /dev/null which runs fine, no errors: ffmpeg version git-N-29568-g3b4621a, Copyright (c) 2000-2011 the FFmpeg developers built on May 2 2011 13:50:23 with gcc 4.6.0 20110428 (Red Hat 4.6.0-6) configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --shlibdir=/usr/lib64 --extra-cflags='-O2 -march=native -mtune=native -fopenmp -fomit-frame-pointer -pipe' --enable-static --enable-shared --enable-gpl --enable-nonfree --enable-version3 --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-gray --enable-vaapi --enable-hardcoded-tables --enable-frei0r --enable-libdirac --disable-decoder=libdirac --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --disable-encoder=libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-zlib --disable-debug --cpu=amdfam10 --arch=x86_64 --enable-pic --enable-libopencv libavutil 51. 2. 0 / 51. 2. 0 libavcodec 53. 3. 0 / 53. 3. 0 libavformat 53. 0. 3 / 53. 0. 3 libavdevice 53. 0. 0 / 53. 0. 0 libavfilter 2. 4. 0 / 2. 4. 0 libswscale 0. 14. 0 / 0. 14. 0 libpostproc 51. 2. 0 / 51. 2. 0 [dv @ 0x2797f00] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from 'play.dv': Duration: 00:51:08.43, start: 0.000000, bitrate: 28771 kb/s Stream #0.0: Video: dvvideo, yuv411p, 720x480, 28771 kb/s, PAR 8:9 DAR 4:3, 29.97 tbr, 29.97 tbn, 29.97 tbc Stream #0.1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s Incompatible pixel format 'yuv411p' for codec 'libx264', auto-selecting format 'yuv420p' [buffer @ 0x279e0a0] w:720 h:480 pixfmt:yuv411p [yadif @ 0x279ebc0] mode:1 parity:0 [hqdn3d @ 0x279f220] ls:4.000000 cs:3.000000 lt:6.000000 ct:4.500000 [hqdn3d @ 0x279f220] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed filter 0 yadif' and the filter 'Parsed filter 1 hqdn3d' [scale @ 0x279f8e0] w:720 h:480 fmt:yuv411p -> w:720 h:480 fmt:yuv420p flags:0xa0000004 [libx264 @ 0x279afc0] using SAR=8/9 [libx264 @ 0x279afc0] using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT [libx264 @ 0x279afc0] profile Main, level 3.1 Output #0, null, to '/dev/null': Metadata: encoder : Lavf53.0.3 Stream #0.0: Video: libx264, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, pass 1, 4000 kb/s, 90k tbn, 59.94 tbc Stream mapping: Stream #0.0 -> #0.0 Press [q] to stop encoding frame=183920 fps=121 q=0.0 Lsize= -0kB time=3068.37 bitrate= -0.0kbits/s video:0kB audio:0kB global headers:0kB muxing overhead -inf% final ratefactor: 19.69 But pass 2 dies: ffmpeg -i play.dv -an -pass 2 -vf yadif=1:0,hqdn3d -vcodec libx264 -preset slower -tune film -r 59.94 -timestamp now -b 4000k -threads 0 Play-yadif1-4000k.m4v .......... [dv @ 0x22f6f00] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from 'play.dv': Duration: 00:51:08.43, start: 0.000000, bitrate: 28771 kb/s Stream #0.0: Video: dvvideo, yuv411p, 720x480, 28771 kb/s, PAR 8:9 DAR 4:3, 29.97 tbr, 29.97 tbn, 29.97 tbc Stream #0.1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s Incompatible pixel format 'yuv411p' for codec 'libx264', auto-selecting format 'yuv420p' [buffer @ 0x22fd260] w:720 h:480 pixfmt:yuv411p [yadif @ 0x22fdd20] mode:1 parity:0 [hqdn3d @ 0x22fe380] ls:4.000000 cs:3.000000 lt:6.000000 ct:4.500000 [hqdn3d @ 0x22fe380] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed filter 0 yadif' and the filter 'Parsed filter 1 hqdn3d' [scale @ 0x22fea00] w:720 h:480 fmt:yuv411p -> w:720 h:480 fmt:yuv420p flags:0xa0000004 [libx264 @ 0x22f9fc0] using SAR=8/9 [libx264 @ 0x22f9fc0] using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT [libx264 @ 0x22f9fc0] timebase mismatch with 1st pass (50/2997 vs 1001/30000) Output #0, ipod, to 'Play-yadif1-4000k.m4v': Stream #0.0: Video: libx264, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, pass 2, 4000 kb/s, 90k tbn, 59.94 tbc Stream mapping: Stream #0.0 -> #0.0 Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height I also tried this without putting a framerate in pass 1. Same result. Also used -r 1001/60000, again same result: [libx264 @ 0xdd10c0] timebase mismatch with 1st pass (1001/60000 vs 1001/30000) How do you ( can you) do a 2 pass encoding while changing the frame rate? sean

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Re: [FFmpeg-user] problem converting and combining these FLV files
by phil curb 09 May '11

09 May '11

I just tried it on another one, combining them, then fixing it with remux ffmpeg -i file.mpg -acodec copy -vcodec mpeg2video file2.mpg and in the middle of file2.mpg, the audio sped up went high and then finished so the video was silent. The audio just lost sync at some point. I don't have a link to the file where that happened, but perhaps somebody knows of why. ---- Howcome this one combines no problem, with copy /b or cat. Without any remux necessary http://www.berkut13.com/videos/brakeup.mpg It suggests to me that Karateka.flv is not being correctly converted to mpg, so the mpegs themselves are a bit odd hence not combining normally. But what's up with them?

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How to trick AVID to accept ffmpeg encoded D10 video?
by christian fafard 08 May '11

08 May '11

Any idea someone?? Baptiste, i know it's your field of expertise, do you have a procedure that works? Maybe the problem is the quicktime container, i don't know if Avid accept AVI for instance. I'm open to any suggestions, it's not vital for me but it's something i would like being able to do. Thanks Christian Fafard

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Re: [FFmpeg-user] problem converting and combining these FLV files
by phil curb 08 May '11

08 May '11

Thanks, so copy /B Karateka.mpg+Karateka2.mpg ffmpeg -i Karateka.mpg -acodec copy -vcodec mpeg2video -sameq whole.mpg That did it. But Howcome this one combines no problem, with copy /b or cat. Without any remux necessary http://www.berkut13.com/videos/brakeup.mpg It suggests to me that Karateka.flv is not being correctly converted to mpg, so the mpegs themselves are a bit odd hence not combining normally. But what's up with them? Am 08.05.2011 02:08, schrieb phil curb: > I have this file, i'm trying to combine it with a copy of itself. > http://www.sendspace.com/file/dkg3rz > > But the result while being twice as big, is the same duration. > > C:\blah>dir > Karateka.flv (399,375) > > I want to create one big file that is 2 of them combined. > > So I convert the flv to mpg which one can combine with copy /B > > ffmpeg -i Karateka.flv -sameq Karateka.mpg > Hello, I did the same on a linux system and while just copying I had similar issues. In my case it helped to do a remux with ffmpeg of the combined file with this command: |cat video1.mxf video2.mxf | ffmpeg -i - -acodec copy -vcodec mpeg2video -b 5M whole.mpg |||This is how it worked on Ubuntu, on a windows set-up you might replace 'cat' with you copy-routine. The '-' as input tells ffmpeg to use the cat-merged file as input. This command is explained on ffmbc.wordpress.com greetings, b ||| | _______________

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problem converting and combining these FLV files
by phil curb 08 May '11

08 May '11

I have this file, i'm trying to combine it with a copy of itself. http://www.sendspace.com/file/dkg3rz But the result while being twice as big, is the same duration. C:\blah>dir Karateka.flv (399,375) I want to create one big file that is 2 of them combined. So I convert the flv to mpg which one can combine with copy /B ffmpeg -i Karateka.flv -sameq Karateka.mpg this has created Karateka.mpg 753,664 I create 2 copies of this. So now 3 in total 753,664 Karateka.mpg 753,664 Karateka2.mpg 753,664 Karateka3.mpg Now I do Copy /B Karateka.mpg+Karateka2.mpg 1,507,328 Karateka.mpg 753,664 Karateka2.mpg 753,664 Karateka3.mpg The problem here is that the mpg that is twice the size, is exactly the same duration as the original. It hasn't combined.

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(no subject)
by Cool Druker 07 May '11

07 May '11

http://adza.gameitis.com/wp-content/themes/motion/mylife.html

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