January 2012 - ffmpeg-devel - lists.ffmpeg.org

[patch] glob matching for image series
by Brian Olson 30 Mar '12

30 Mar '12

ffmpeg can take a sequentially numbered series of image files and make them into a video. I like to datestamp my images "20120106_134500.jpg" or similar. I used the "glob" library to allow things like: ffmpeg -i \*.jpg ... It picks things up in ascii-betical order and is much simpler than writing scripts to link or rename all my images. I think it's a good idea and people will find this to be natural and useful behavior. I posted copy of my repo to: http://bolson.org/~bolson/ffmpeg.git/ My changes are in a branch "bolson-wordexp" (slightly misnamed...) I can make a patch file if you have a preferred way of dealing with git. I tried to do this a year ago but used the "wordexp" library, but was blocked because wordexp can run shell commands passed in as an argument, creating a potential security hole if someone managed to make a web page pass arguments all the way in to "-i ...*.jpg" of ffmpeg. I backed off to the lesser "glob" library that just does pattern matching on file names. My change includes an update to the configure script, a documentation change, and the functional change to the code that reads image sequences. Brian Olson http://bolson.org/

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[RFC] Google Summer of Code 2012
by compn 23 Mar '12

23 Mar '12

whos in this year? http://wiki.multimedia.cx/index.php?title=FFmpeg_/_Libav_Summer_Of_Code_2012 Are there any big things you want worked on? BluRay support? :) -compn

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[RFC] winter logo
by Michael Niedermayer 23 Mar '12

23 Mar '12

Hi I suggest we replace our logo with: http://www.google-melange.com/gci/task/view/google/gci2011/7191489 for the time of winter. It has been drawn by Daniel Perez in Google Code In Smaller version attached We will also need a news entry about this, if someone wants to write one ? -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Breaking DRM is a little like attempting to break through a door even though the window is wide open and the only thing in the house is a bunch of things you dont want and which you would get tomorrow for free anyway

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[PATCH] Print a warning when using wild guesses as time stamps.
by Reimar Döffinger 21 Mar '12

21 Mar '12

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger(a)gmx.de> --- libavformat/utils.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/libavformat/utils.c b/libavformat/utils.c index 9e3f775..dcf773f 100644 --- a/libavformat/utils.c +++ b/libavformat/utils.c @@ -3282,6 +3282,11 @@ static int compute_pkt_fields2(AVFormatContext *s, AVStream *st, AVPacket *pkt){ //XXX/FIXME this is a temporary hack until all encoders output pts if((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !delay){ + static int warned; + if (!warned) { + av_log(s, AV_LOG_WARNING, "Encoder did not produce proper pts, making some up.\n"); + warned = 1; + } pkt->dts= // pkt->pts= st->cur_dts; pkt->pts= st->pts.val; -- 1.7.8.3

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[PATCH] ffplay: force refresh event when the SDL window is resized
by Stefano Sabatini 15 Mar '12

15 Mar '12

Address roundup issue #604, #1031, #1804. --- ffplay.c | 26 ++++++++++++++++++++++---- 1 files changed, 22 insertions(+), 4 deletions(-) diff --git a/ffplay.c b/ffplay.c index 5032586..a6d2cd2 100644 --- a/ffplay.c +++ b/ffplay.c @@ -132,6 +132,7 @@ typedef struct VideoState { AVInputFormat *iformat; int no_background; int abort_request; + int force_refresh; int paused; int last_paused; int seek_req; @@ -1119,9 +1120,15 @@ static void video_refresh_timer(void *opaque) if (is->video_st) { retry: - if (is->pictq_size == 0) { - //nothing to do, no picture to display in the que - } else { + if (is->pictq_size == 0 && is->force_refresh) { + // display last picture in the queue + SDL_LockMutex(is->pictq_mutex); + is->pictq_size++; + is->pictq_rindex = (is->pictq_rindex + VIDEO_PICTURE_QUEUE_SIZE -1) % VIDEO_PICTURE_QUEUE_SIZE; + SDL_CondSignal(is->pictq_cond); + SDL_UnlockMutex(is->pictq_mutex); + } + if (is->pictq_size) { double time= av_gettime()/1000000.0; double next_target; /* dequeue the picture */ @@ -1140,7 +1147,7 @@ retry: }else{ next_target= vp->target_clock + is->video_clock - vp->pts; //FIXME pass durations cleanly } - if(framedrop && time > next_target){ + if (framedrop && !is->force_refresh && time > next_target) { is->skip_frames *= 1.0 + FRAME_SKIP_FACTOR; if(is->pictq_size > 1 || time > next_target + 0.5){ /* update queue size and signal for next picture */ @@ -1211,6 +1218,7 @@ retry: is->pictq_size--; SDL_CondSignal(is->pictq_cond); SDL_UnlockMutex(is->pictq_mutex); + is->force_refresh = 0; } } else if (is->audio_st) { /* draw the next audio frame */ @@ -2759,6 +2767,8 @@ static void event_loop(void) break; case SDLK_f: toggle_full_screen(); + if (cur_stream) + cur_stream->force_refresh = 1; break; case SDLK_p: case SDLK_SPACE: @@ -2813,6 +2823,7 @@ static void event_loop(void) pos += incr; stream_seek(cur_stream, (int64_t)(pos * AV_TIME_BASE), (int64_t)(incr * AV_TIME_BASE), 0); } + cur_stream->force_refresh = 1; } break; default: @@ -2864,6 +2875,7 @@ static void event_loop(void) SDL_HWSURFACE|SDL_RESIZABLE|SDL_ASYNCBLIT|SDL_HWACCEL); screen_width = cur_stream->width = event.resize.w; screen_height= cur_stream->height= event.resize.h; + cur_stream->force_refresh = 1; } break; case SDL_QUIT: @@ -2881,6 +2893,12 @@ static void event_loop(void) default: break; } + + if (cur_stream && cur_stream->force_refresh) { + event.type = FF_REFRESH_EVENT; + event.user.data1 = cur_stream; + SDL_PushEvent(&event); + } } } -- 1.7.2.3

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Latest FFMPEG 0.9 Issues
by C Chatterjee 12 Mar '12

12 Mar '12

I have been working with the latest ffmpeg 0.9 release and discovered the following issues which did not exist in the last ffmpeg I have been using from Jan 2011. 1. AAC audio decode. I have a number of (H264+AAC) sequences which decoded fine but now I get an error in the first packet and works fine from there on. I found the issue in parse_adts_frame_header() function in aacdec.c. The sequence is initialized with ac->m4ac.chan_config = 2. But this function sets it to 0. Hence it fails in aac_decode_frame_int() and produces the following error: if (!(che=get_che(ac, elem_type, elem_id))) { av_log(ac->avctx, AV_LOG_ERROR, "channel element %d.%d is not allocated\n", elem_type, elem_id); return -1; } The old ffmpeg initialized ac->m4ac.chan_config to 0 and set it to 2 in the parse_adts_frame_header(). Commenting out ac->m4ac.chan_config = 0; in parse_adts_frame_header() works great. 2. AAC Encode to flv and mp4/mov If the first aac packet has the 2 byte header and payload together, the old ffmpeg encoded it correctly. The new ffmpeg checks for the pkt size to be 2 and errors. flvenc.c - flv_write_packet() and movenc.c - ff_mov_write_packet() have the following lines of code: else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) { av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n"); return -1; Commenting this out the pkt->size > 2 works great. Otherwise we need to use -absf aac_adtstoasc. 3. Multibitrate output in one copy and one transcoded mode - FATA ERROR The following configuration crashes ffmpeg: ffmpeg -y -i Cricket-360p-600k.flv -an -vcodec copy -vbsf h264_mp4toannexb x1.ts -an -vcodec libx264 -preset superfast -b:v 300k -vbsf h264_mp4toannexb x2.ts The same happens for -acodec copy instead of -an in one or both outputs. av_vsrc_buffer_add_frame(ost->input_video_filter, decoded_frame, AV_VSRC_BUF_FLAG_OVERWRITE); in transcode_video() in ffmpeg.c has a NULL src buffer. Several other combinations have similar issues. Chanchal Chatterjee

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[PATCH] iff: check for pbm tag
by ami_stuff 12 Mar '12

12 Mar '12

more robust

4 7

select interface for multicast messages
by Tudor SUCIU 12 Mar '12

12 Mar '12

I used VLC sources in order to duplicate the --miface option so that we could receive multicast udp from a specific interface. What needs to be done in order to have this patch accepted?

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[PATCH 2/2] dxva2_vc1: pass the overlap flag to the decoder
by Hendrik Leppkes 12 Mar '12

12 Mar '12

Hi, attached patch fixes an oversight in the DXVA2 VC-1 decoder. According to the spec, the overlap flag needs to be specified in the 6th bit of the bPicDeblocked element, if the frame is not a B-Frame (on B-Frames, it shall be zero) This fixes corruption when playing streams with the flag enabled. - Hendrik

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[PATCH 1/2] dxva2_vc1: fix decoding of BI frames
by Hendrik Leppkes 12 Mar '12

12 Mar '12

Hi, attached patch fixes a decoding error in the DXVA2 VC-1 decoder when BI-Frames are present. BI-Frames are intra coded, and therefor have no references, however the decoder marks them as B frames. This has to be taken into account when filling the DXVA format structures. - Hendrik

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