[FFmpeg-devel] [PATCH 2/7] avcodec/ffv1enc: add information message when version is changed by the encoder

Jerome Martinez jerome at mediaarea.net
Thu Mar 8 04:12:26 EET 2018


On 08/03/2018 01:33, Michael Niedermayer wrote:
> On Wed, Mar 07, 2018 at 04:49:24PM +0100, Jerome Martinez wrote:
>> There is a message when coder type is forced to a value not chosen by user,
>> but no message when version is forced to a value not chosen by user.
>> This patch adds such message for more coherency in the messages, and the
>> user is informed that the command is not fully respected.
>>
>> ffmpeg f lavfi -i mandelbrot=s=1920x1080 -vf format=gbrp9 -vframes 1 -c ffv1
>> -level 0 -coder 0 a.mkv
>>
>> Before:
>> [ffv1 @ 000002492CD69B40] bits_per_raw_sample > 8, forcing range coder
>>
>> After:
>> [ffv1 @ 000001A6E404A780] bits_per_raw_sample > 8, forcing version 1
>> [ffv1 @ 000001A6E404A780] bits_per_raw_sample > 8, forcing range coder
>>
>>
>>   ffv1enc.c |    8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>> cb1df919e21fe4d388df7de9349c5c2c46777862  0002-avcodec-ffv1enc-add-information-message-when-version.patch
>>  From 49db6049fa50976683fc651cf180ab8c7428225e Mon Sep 17 00:00:00 2001
>> From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Martinez?= <jerome at mediaarea.net>
>> Date: Wed, 7 Mar 2018 10:37:46 +0100
>> Subject: [PATCH 2/7] avcodec/ffv1enc: add information message when version is
>>   changed by the encoder
>>
>> ---
>>   libavcodec/ffv1enc.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
>> index d71d952c6d..ac8b715b74 100644
>> --- a/libavcodec/ffv1enc.c
>> +++ b/libavcodec/ffv1enc.c
>> @@ -509,7 +509,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
>>   {
>>       FFV1Context *s = avctx->priv_data;
>>       const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
>> -    int i, j, k, m, ret;
>> +    int i, j, k, m, ret, oldversion;
>>   
>>       if ((ret = ff_ffv1_common_init(avctx)) < 0)
>>           return ret;
>> @@ -534,6 +534,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
>>           }
>>           s->version = avctx->level;
>>       }
>> +    oldversion = s->version;
>>   
>>       if (s->ec < 0) {
>>           s->ec = (s->version >= 3);
>> @@ -679,6 +680,11 @@ FF_ENABLE_DEPRECATION_WARNINGS
>>       av_assert0(s->bits_per_raw_sample >= 8);
>>   
>>       if (s->bits_per_raw_sample > 8) {
>> +        if (oldversion >= 0 && oldversion != s->version) {
>> +            av_log(avctx, AV_LOG_INFO,
>> +                    "bits_per_raw_sample > 8, forcing version 1\n");
>> +            oldversion = s->version;
>> +        }
> I dont think this works consistently
>
> The code does not seem to be limited to the case where the user has
> specifified a version for example unless i miss something

checking range coder part, I see that currently there is actually a 
slight difference with the other AV_LOG_INFO, I don't indicate the 
message when level is not indicated, as I didn't see the value added of 
such information when level is not indicated on the command line when I 
implemented the test.

With patch proposal:

ffmpeg f lavfi -i mandelbrot=s=1920x1080 -vf format=gbrp9 -vframes 1 -c 
ffv1 a.mkv
[ffv1 @ 00000232D35B9240] bits_per_raw_sample > 8, forcing range coder
(no change)

ffmpeg f lavfi -i mandelbrot=s=1920x1080 -vf format=gbrp9 -vframes 1 -c 
ffv1 -coder 0 a.mkv
[ffv1 @ 0000014B9B1771C0] bits_per_raw_sample > 8, forcing range coder
(no change)

ffmpeg f lavfi -i mandelbrot=s=1920x1080 -vf format=gbrp9 -vframes 1 -c 
ffv1 -level 0 a.mkv
[ffv1 @ 000001BC2B881500] bits_per_raw_sample > 8, forcing version 1
[ffv1 @ 000001BC2B881500] bits_per_raw_sample > 8, forcing range coder
("version 1" line added because user specified version 0, IMO encoder 
should inform user that this is not respected)

ffmpeg f lavfi -i mandelbrot=s=1920x1080 -vf format=gbrp9 -vframes 1 -c 
ffv1 -level 0 -coder 0 a.mkv
[ffv1 @ 000001EAC7685180] bits_per_raw_sample > 8, forcing version 1
[ffv1 @ 000001EAC7685180] bits_per_raw_sample > 8, forcing range coder
("version 1" line added because user specified version 0, IMO encoder 
should inform user that this is not respected)

Just for being clear: do you want info message also when level/version 
is *not* indicated on the command line?




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